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自适应粒子成像测速场仪（PIV）

自适应粒子成像测速场仪（PIV）

自适应粒子成像测速场仪（PIV）

报价

¥150万 - 200万

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品牌

LaVision GmbH

样本

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型号

FlowMaster®-Adaptive

荣誉奖项

--

产地

欧洲

北京欧兰科技发展有限公司

金牌
第17年
一般经销商

营业执照已审核

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核心参数

测量效果： 平面（二位/三维）

产地类别： 进口

测量频率： 低频

测速范围： 0-2km/s

测定准确度： 1%

测量区域大小： 1mx1m

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仪器简介：

迄今，PIV用户仍然需要具有相当丰富的知识和经验来选择最优化的数据记录（主要是粒子图像数据记录）参数和恰当的数据分析处理参数，特别是相关运算的问询域尺度的设置。相关运算问询域尺度的设定是需要一定的技巧经验甚至是艺术的。因为在设置这一参数时，须在分析的鲁棒性，精度和有效空间分辨率等目标之间进行必要的权衡和取舍。此外, 由于所观测流场各局部区域之间的示踪粒子密度，图像质量和流动条件具有不可避免的差异和变化，对流场采用全局统一单一的分析参数设置将永远无法实现对整个流场的各部分均有效的最优化。

LaVision公司最新的自适应PIV（Adaptive PIV）技术的推出，提供了一种根据流场在各个局域流动梯度（流动的自适应）和图像质量（信号的自适应）全自动优化计算并设置局部相关运算问询域的尺寸和形状的方法。这种技术极大地改善了PIV测量的精度和空间分辨率。尤其是对于像近壁面，剪切流等流场的梯度很大的区域。

技术参数：

??提高了分析处理的空间分辨率，精度和运算速度。
??自动适应局部流动特点，全自动，无需人工干预地优化设置局部问询域尺寸和形状。
??控制图像的对焦，亮度，失踪粒子密度以及双帧曝光时间间隔dt
??用户友好的交互界面: 参数自动设定和优化，不用人工设定，定义。

主要特点：

LaVision的FlowMaster^® 系统能够不经过人工干预直接判定设置局域示踪粒子密度，图像对比度/动态范围和最大位移量。在实验装置建立过程中为用户提供实时有效的反馈。PIV测量所特有的也是最重要的拍摄记录参数-跨帧拍摄时间间隔可以自动优化设置。
用流动梯度的强度和反映示踪粒子密度，图像质量，离开平面运动的相关函数峰值强度（不仅仅是峰值的位置）等这两类因素的组合来决定相关运算问询域的尺度。在梯度大的区域，例如漩涡处，较小的问询域更为合适，而在粒子密度低并有较强的脱离测量平面运动分量的情况下则需要设置更大的问询域。此外用加长的问询域窗口形状，使长轴垂直于局部流动梯度最大的方向可以使相互垂直的两个方向中的一个方向上的空间分辨率增强，同时保证在长轴方向上粒子有足够大的位移像素数目，以保证速度矢量的测量精度。这种处理方法对沿着流体具有强剪切流动的区域更为重要。在这些区域，问询域窗口可以自动地被调整为沿着边界排列。当然，问询域窗口的尺寸和形状是完全自动选择设置的不需要低效，费时，繁琐的人工定义。这种完全自动的，自适应的定义问询域的方法适用于各种流动对象。而那种人工定义问询域的方法，当速度矢量场是非定常的（实事上这是流动的更一般的形态，定常流动只是一个理想化的状态。任何流动都只可能是在一定范围内的近似定常流动，没有绝对的定常流动）时候将会实效。因为流动结构特点在被测区域上的空间位置会随着时间变化，移动。为了适应多种流动特点，问询域窗口尺寸的自动调整设置范围以及自适应程度均可由用户根据具体情况灵活地自行定义和设置。

相关方案

综合其他生物产业农/林/牧/渔电子/电气交通

边界层,湍流中速度矢量场检测方案(粒子图像测速)
A flat plate boundary layer flow was generated at the open test section of the circuit type 1m- wind tunnel of the DLR, Gottingen, at a free stream velocity of U亣 = 7 m/s with zero pressure gradients. A transparent and smooth surface glass plate is utilized to provide optical access from its bottom and a good flow quality. The plate has an elliptic leading edge to prevent flow separation. Four tripping wires, one with 1.5 mm diameter and three with 1 mm diameter were positioned with 1 mm x-distance close to the surface at (Rex). . 290 along the whole span-wise elongation of the plate. This bypass transition of the flow results in the development of a turbulent boundary layer flow. In a box of about 34 x 18 x 35 mm3 in x-y and z-directions around (Rex). . 450 tracer particles has been illuminated by laser light pulses at 4 kHz with 21 mJ each in order to achieve PIV recordings without using the frame straddling method. The light source was a Nd:YAG laser from Lee Laser inc. Two highly reflective dielectric mirrors aligned in the x-y-direction are installed nearly parallel and close to the surface of the flat plate on opposite sides of the measurement region. The collimated laser beam undergoes multiple reflections between the two mirrors passing through the measurement volume approximately 15 times before exiting (see sketch left). This arrangement resulted in a light amplification with a factor ~5 with respect to a single pass system. The specific illumination arrangement has the advantage that all viewing directions collect scattered light both in forward and backward directions, which provided the level of light needed for imaging particles in the whole volume.
其他 2013-02-13
流体中速度场检测方案
Corning® Advanced-Flow™ glass reactors are continuous flow reactors with hydraulic diameter in the range of millimetres. These devices make possible the switch of chemical reactions from batch mode to continuous processing through more efficient, more economical and safer processes. In addition, these reactors provide a platform for developing innovative chemistries that have never been considered industrially practical, either for hazard or yield reasons. Corning proprietary apparatuses are compact, adaptable and scalable, optimizing overall production cost and quality of high-value specialty, fine, and pharmaceutical chemicals. Corning Advanced-Flow™ glass reactors are composed of multiple inter-connected glass devices having different designs, offering the advantages of process intensification and glass-specific qualities like transparency and very good chemical resistance. This paper presents the comparison between experimental and CFD modelling results of a family of Corning glass devices aiming at achieving and maintaining very efficient mixing along the dwell time path. Numerical results are compared to experimental data: velocity profiles measured by micro-PIV means, pressure drop and heat transfer coefficient. The satisfactory agreement between experimental results and CFD modelling proved the utility of numerical simulations in the development of new designs. Therefore, CFD tools help on one hand to predict the performance of new devices and on the other hand to optimize their design in order to improve their behaviour. Thus, CFD simulation facilitates the design and reduces time and cost for the investigation.
其他 2011-03-07
流体中速度场检测方案
PIV systems rely on a combination of seed particles, laser light intensity, and camera positioning to collected velocity data. Careful attention is needed when selecting the ap- propriate setup conguration for PIV systems. This paper focuses on several areas for improvement in PIV data collection for a compressible turbulent boundary layer study on a at plate using MVG's. The topics include determining the seed particle surface preparation for a at plate, and PIV system conguration.
农/林/牧/渔 2012-07-10
流体中速度场检测方案
Turbulence of the round jet has been assessed using invariants of the velocity gradient tensor. Experimental data, obtained using Tomographic Particle Image Velocimetry (Tomo-PIV), using four PCO-4000 cameras with 11 megapixel resolution, is presented for a seeded free air jet, operating in the turbulent regime and the Re number based on the diameter of the nozzle is 10000. Using the acquired 3-D velocity fields, the local statistical and geometrical structure of three-dimensional turbulent flow can be described by properties of the velocity gradient tensor. The invariants of the velocity gradient (R and Q), rate-of-strain ( Rs andQs ), and rate-of-rotation (Qw ) tensors are analyzed across the turbulent expanding regions at different distances from the nozzle outlet. More specifically, the JPDF of invariants is computed, which allows a detailed statistical characterization of the dynamics, geometry and topology of the flow during the entrainment process. It should be noted that the results obtained are indicative of the preliminary work in this area.
其他 2013-06-30

边界层,湍流中速度矢量场检测方案(粒子图像测速)
A flat plate boundary layer flow was generated at the open test section of the circuit type 1m- wind tunnel of the DLR, Gottingen, at a free stream velocity of U亣 = 7 m/s with zero pressure gradients. A transparent and smooth surface glass plate is utilized to provide optical access from its bottom and a good flow quality. The plate has an elliptic leading edge to prevent flow separation. Four tripping wires, one with 1.5 mm diameter and three with 1 mm diameter were positioned with 1 mm x-distance close to the surface at (Rex). . 290 along the whole span-wise elongation of the plate. This bypass transition of the flow results in the development of a turbulent boundary layer flow. In a box of about 34 x 18 x 35 mm3 in x-y and z-directions around (Rex). . 450 tracer particles has been illuminated by laser light pulses at 4 kHz with 21 mJ each in order to achieve PIV recordings without using the frame straddling method. The light source was a Nd:YAG laser from Lee Laser inc. Two highly reflective dielectric mirrors aligned in the x-y-direction are installed nearly parallel and close to the surface of the flat plate on opposite sides of the measurement region. The collimated laser beam undergoes multiple reflections between the two mirrors passing through the measurement volume approximately 15 times before exiting (see sketch left). This arrangement resulted in a light amplification with a factor ~5 with respect to a single pass system. The specific illumination arrangement has the advantage that all viewing directions collect scattered light both in forward and backward directions, which provided the level of light needed for imaging particles in the whole volume.
其他 2013-02-13
流体中速度场检测方案
Corning® Advanced-Flow™ glass reactors are continuous flow reactors with hydraulic diameter in the range of millimetres. These devices make possible the switch of chemical reactions from batch mode to continuous processing through more efficient, more economical and safer processes. In addition, these reactors provide a platform for developing innovative chemistries that have never been considered industrially practical, either for hazard or yield reasons. Corning proprietary apparatuses are compact, adaptable and scalable, optimizing overall production cost and quality of high-value specialty, fine, and pharmaceutical chemicals. Corning Advanced-Flow™ glass reactors are composed of multiple inter-connected glass devices having different designs, offering the advantages of process intensification and glass-specific qualities like transparency and very good chemical resistance. This paper presents the comparison between experimental and CFD modelling results of a family of Corning glass devices aiming at achieving and maintaining very efficient mixing along the dwell time path. Numerical results are compared to experimental data: velocity profiles measured by micro-PIV means, pressure drop and heat transfer coefficient. The satisfactory agreement between experimental results and CFD modelling proved the utility of numerical simulations in the development of new designs. Therefore, CFD tools help on one hand to predict the performance of new devices and on the other hand to optimize their design in order to improve their behaviour. Thus, CFD simulation facilitates the design and reduces time and cost for the investigation.
其他 2011-03-07
流体中速度场检测方案
Turbulence of the round jet has been assessed using invariants of the velocity gradient tensor. Experimental data, obtained using Tomographic Particle Image Velocimetry (Tomo-PIV), using four PCO-4000 cameras with 11 megapixel resolution, is presented for a seeded free air jet, operating in the turbulent regime and the Re number based on the diameter of the nozzle is 10000. Using the acquired 3-D velocity fields, the local statistical and geometrical structure of three-dimensional turbulent flow can be described by properties of the velocity gradient tensor. The invariants of the velocity gradient (R and Q), rate-of-strain ( Rs andQs ), and rate-of-rotation (Qw ) tensors are analyzed across the turbulent expanding regions at different distances from the nozzle outlet. More specifically, the JPDF of invariants is computed, which allows a detailed statistical characterization of the dynamics, geometry and topology of the flow during the entrainment process. It should be noted that the results obtained are indicative of the preliminary work in this area.
其他 2013-06-30
流体中评价比较分析手段的方法检测方案(粒子图像测速)
In this report we present the methodology we are using in the AMI group to compare optic flow estimation methods in the context of the FLUID Specific Targeted Research Project - Contract No 513633 founded by the CEE. The main goal of this report is to try to unify comparison criteria between the different parnerts in order to share information and conclusions. We think that it is one of the topics we have to address in Las Palmas Meeting December next. In order to describe the methodology we use, we divide it in five steps: 1. We choose a number of optic flow estimation methods 2. We choose an image sequence dataset to apply the methods. 3. We apply the methods and we store the results in a ASCII file using an standard format 4. We define a number of statistics to compare the methods (we use the ASCII files as basic information to compare). 5. We compute the statistics for each pair of methods and we generate tables with the information. To help result interpretation we use arrow images and in the case we know the optic flow groundtruth we generate image to provide the information about what method perform better in the different areas of the image. To illustrate this approach and to fit ideas we present the results of this approach in a particular image sequence provided by LaVision in sections from 1.1 to 1.4. Then, in section 2 we remark some of the difficulties we have found in our work, which should be discussed in order to be able to compare results provided by all the partners of the FLUID project.
其他 2012-07-01

沙漠蝗虫中通过翅振产生的时变跨越效率研究检测方案(粒子图像测速)
The flight performance of animals depends greatly on the efficacy with which they generate aerodynamic forces. Accordingly, maximum range, load-lifting capacity and peak accelerations during manoeuvres are all constrained by the efficiency of momentum transfer to the wake. Here, we use high-speed particle image velocimetry (1 kHz) to record flow velocities in the near wake of desert locusts (Schistocerca gregaria, Forska?l).We use the measured flow fields to calculate time-varying span efficiency throughout the wing stroke cycle. The locusts are found to operate at a maximum span efficiency of 79 per cent, typically at a plateau of about 60 per cent for the majority of the downstroke, but at lower values during the upstroke. Moreover, the calculated span efficiencies are highest when the largest lift forces are being generated (90% of the total lift is generated during the plateau of span efficiency) suggesting that the combination of wing kinematics and morphology in locust flight perform most efficiently when doing the most work.
生物产业 2013-06-01
翼型中流场，声学特性检测方案
The rod-airfoil con痝uration is a benchmark test case for aeroacoustic assessments of vortex- structure interaction noise. Several industrial devices are arranged in such a way that down- stream bodies are embedded in the wake of upstream bodies, such as gas turbines, high lift devices, helicopters among others. Aeroacoustic predictions usually rely on time dependent 皁w 痚ld information obtained from CFD for the determination of the aeroacoustic sources. The present work proposes a novel approach for the aeroacoustic prediction of rod-airfoil noise based on time-resolved PIV experimental data. The aeroacoustic emission of a NACA0012 airfoil in the Karman wake of a rod is investigated by means of 2D TR-PIV in combination with beamforming and microphone measurements. First the time evolving velocity 痚ld around the airfoil is measured using high-speed PIV. The corresponding pressure 痚ld is then deduced by spatial integration of a Poisson-based algorithm for quasi-2D incompressible 皁ws. Pressure and velocity computed on speci痗 surfaces around the airfoil constitute the source terms of the implemented Curle's and Ffowcs Williams-Hawkings's aeroacoustic analogies. The calculated Sound Pressure Level (SPL) is compared with the measurements obtained by far 痚ld microphones. Velocity visualizations in the spanwise direction provide qualitative information about the phase coherence of the vortical impingement along the airfoil span. Parametric studies are performed to evaluate the e甧ct on the acoustic prediction of the position of the integration surface and the numerical discretization methods employed.
生物产业 2013-05-04

流体中速度场检测方案
PIV systems rely on a combination of seed particles, laser light intensity, and camera positioning to collected velocity data. Careful attention is needed when selecting the ap- propriate setup conguration for PIV systems. This paper focuses on several areas for improvement in PIV data collection for a compressible turbulent boundary layer study on a at plate using MVG's. The topics include determining the seed particle surface preparation for a at plate, and PIV system conguration.
农/林/牧/渔 2012-07-10

空气流场，离子中速度场检测方案(粒子图像测速)
全场测试。测试对象为辉光放电中的等离子体。和理论计算模拟相对比。对于电子设备散热，器件热传导规律的认识有借鉴和参照意义。
电子/电气 2013-09-25

悬翼机中远端尾流涡旋翻滚检测方案
The far wake trajectory of the tumbling tip vortex effect of a reduced-scale, 1 m diame- ter, four-bladed rotor during hover is studied using vortex methods combined with a center of mass analysis approach. Measurements of all three components of the velocity field are acquired using a stereo PIV system synchronized to capture up to 800 wake age of the vortex with 10 offsets during hover conditions. The nominal operating condition of the rotor is at a rotational speed of 1520RPM, corresponding to Rec = 248,000 with a chord length of 58.5mm. The rotor was operated with a pitch of 7.2± 0.5 and a CT / of 0.029. The far wake vortex tumbling phenomenon is captured and described. It is shown that tip vortices from two blades tumble through approximately 180 of rotation before they coalesce. It is seen that the parent vortices are stronger than the daughter vortex, but due to vortex stretching the daughter vortex has a smaller radius with greater swirl strength. An accurate characterization and prediction of the trajectory of the far wake vortex tum- bling can enhance the ability to predict and alleviate the resuspension of particles during brownout as well as provide a database for far wake validation of CFD codes.
交通 2013-06-30

相关仪器相关资料

层析PIV

湍流本质上具有三维（3D）立体结构属性。普通的二维（2D）包括采用激光照明的成像测量无法在所有三个空间维度上分辨湍流的结构。而利用多视角成像信息，采用层析重构技术则可以在三个空间维度上同时捕捉记录复杂流动的瞬态结构。应用针对体像素的三维（3D）相关处理技术，可以由时间相关的体成像数据计算出瞬态三维空间的流场。 LaVision功能强大的，基于层析粒子成像测速（Tomo-PIV）和层析粒子跟踪测速（Tomo-PTV）技术的FlowMaster激光成像系统，能够以极高的空间分辨率记录强湍流，火焰以及喷雾对象的瞬态体视流场。

29025MB 2016-09-14
利用2维粒子成像测速技术研究鲨鱼自由游动的水动力学推动机制用于优化水中船舶的推进特性

Two-dimensional velocity fields around a freely swimming freshwater black shark fish in longitudinal (XZ) plane and transverse (YZ) plane are measured using digital particle image velocimetry (DPIV). By transferring momentum to the fluid, fishes generate thrust. Thrust is generated not only by its caudal fin, but also using pectoral and anal fins, the contribution of which depends on the fish’s morphology and swimming movements. These fins also act as roll and pitch stabilizers for the swimming fish. In this paper, studies are performed on the flow induced by fins of freely swimming undulatory carangiform swimming fish (freshwater black shark, L = 26 cm) by an experimental hydrodynamic approach based on quantitative flow visualization technique. We used 2D PIV to visualize water flow pattern in the wake of the caudal, pectoral and anal fins of swimming fish at a speed of 0.5–1.5 times of body length per second.

6233MB 2016-08-26
气体自由喷射的单次体视3维层析激光诱导荧光成像研究

Single-shot, tomographic imaging of the three-dimensional concentration field is demonstrated in a turbulent gaseous free jet in co-flow using volumetrically illuminated laser-induced fluorescence. The fourthharmonic output of an Nd:YAG laser at 266 nm is formed into a collimated 15 × 20 mm2 beam to excite the ground singlet state of acetone seeded into the central jet. Subsequent fluorescence is collected along eight lines of sight for tomographic reconstruction using a combination of stereoscopes optically coupled to four two-stage intensified CMOS cameras. The performance of the imaging system is evaluated and shown to be sufficient for recording instantaneous three-dimensional features with high signal-tonoise (130:1) and nominal spatial resolution of 0.6–1.5 mm at x/D = 7–15.5.

2803MB 2016-08-26
游动的未成熟海胆幼虫的个体发育变化和湍流中的取向

Many marine organisms have complex life histories, having sessile adults and relying on the planktonic larvae for dispersal. Larvae swim and disperse in a complex fluid environment and the effect of ambient flow on larval behavior could in turn impact their survival and transport. However, to date, most studies on larvae–flow interactions have focused on competent larvae near settlement. We examined the importance of flow on early larval stages by studying how local flow and ontogeny influence swimming behavior in pre-competent larval sea urchins, Arbacia punctulata. We exposed larval urchins to grid-stirred turbulence and recorded their behavior at two stages (4- and 6-armed plutei) in three turbulence regimes. Using particle image velocimetry to quantify and subtract local flow, we tested the hypothesis that larvae respond to turbulence by increasing swimming speed, and that the increase varies with ontogeny.

502MB 2016-08-26

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