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Imager SX PIV相机

Imager SX PIV相机

Imager SX PIV相机

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LaVision GmbH

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Imager SX

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欧洲

北京欧兰科技发展有限公司

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第17年
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Depending on the requirements for your specific application LaVision offers different PIV cameras.

Imager SX cameras are very compact and lightweight, price-efficient high resolution and low noise digital cameras. The cameras are available with 4MegaPixel or 5MegaPixel spatial resolution and frame rates up to 30 Hz and 15 Hz respectively. Both models can be operated at full spatial resolution or in reduced resolution mode so that a high framerate can be achieved when required.

相关方案

综合其他医疗/卫生交通地矿航空航天

短耳犬蝠中速度场,速度矢量场检测方案(粒子图像测速)
We investigated the detailed kinematics and wake structure of lesser dog-faced fruit bats (Cynopterus brachyotis) flying in a wind tunnel. High speed recordings of the kinematics were conducted to obtain three-dimensional reconstructions of wing movements. Simultaneously, the flow structure in the spanwise plane perpendicular to the flow stream was visualized using time-resolved particle image velocimetry. The flight of four individuals was investigated to reveal patterns in kinematics and wake structure typical for lower and higher speeds. The wake structure identified as typical for both speed categories was a closed-loop ring vortex consisting of the tip vortex and the limited appearance of a counter-rotating vortex near the body, as well as a small distally located vortex system at the end of the upstroke that generated negative lift. We also investigated the degree of consistency within trials and looked at individual variation in flight parameters, and found distinct differences between individuals as well as within individuals. Supplementary material available online at http://jeb.biologists.org/cgi/content/full/213/20/3427/DC1 Key words: bat flight, kinematics, wake structure.
其他 2011-02-17
制冷器,热声制冷器中速度,速度矢量场检测方案(粒子图像测速)
Thermoacoustic refrigeration systems generate cooling power from a high-amplitude acoustic standing wave. There has recently been a growing interest in this technology because of its simple and robust architecture and its use of environmentally safe gases. With the prospect of commercialization, it is necessary to enhance the efficiency of thermoacoustic cooling systems and more particularly of some of their components such as the heat exchangers. The characterization of the flow field at the end of the stack plates is a crucial step for the understanding and optimization of heat transfer between the stack and the heat exchangers. In this study, a specific Particle Image Velocimetry measurement(PIV) is performed inside a thermoacoustic refrigerator. Acoustic velocity is measured using synchronization and phase-averaging. The measurement method is validated inside a void resonator by successfully comparing experimental data with an acoustic plane wave model. Velocity is measured inside the oscillating boundary layers, between the plates of the stack, and compared to a linear model. The flow behind the stack is characterized, and it shows the generation of symmetric pairs of counterrotating vortices at the end of the stack plates at low acoustic pressure level. As the acoustic pressure level increases, detachment of the vortices and symmetry breaking are observed.
其他 2008-06-22
柔性圆柱体,流线型拖曳装置,尾流区,边界层中速度场检测方案(粒子图像测速)
This is an experimental study to evaluate the development of the boundary layer thickness, δ, and momentum thickness, θ, along long thin flexible cylinders (L/a=1.5*105 and 3.0*105 where δ/a>>1, a=radius). The experiments use conventional test methods in conjunction with Stereo Particle Image Velocimetry (SPIV) measurement techniques to evaluate the flow in the boundary region of a small diameter flexible cylinder towed in the high speed towing basin at the Naval Surface Warfare Center Carderock Division (NSWCCD). The flexible cylinders are approximately neutrally buoyant and have an initial length of 152 m and radii of 0.45 mm and 1.25 mm. The first objective for this experiment is to evaluate the streamwise development of wall shear stress (τw) and momentum thickness (θ) in axisymmetric turbulent boundary layers using drag measurements at 3.1, 5.2, 9.3 and 14.4 m/s for comparison to existing data. The second and primary objective for this experiment is to determine the streamwise development of the axisymmetric boundary layer flow and to evaluate relevant boundary layer parameters at 3.8, 7.7, 12.9 and 15.4 m/sec using SPIV images acquired over the entire length of the cylinders. Drag measurements reveal that the wall shear stress is large and that the momentum thickness grows slowly when compared to flat plate boundary layers. The velocity field data shows that the boundary flow remains turbulent over the entire length of the flexible cylinder and that the turbulent profile is different from that of flat plate boundary layers.
其他 2008-06-16
流体中速度场检测方案(粒子图像测速)
The results of flow experiments performed in a cylinder array designed to mimica Next Generation Nuclear Plant lower plenum design are presented. Pressure drop and velocity field measurements are made. Based on these measurements, five regimes of behavior are identified that are found to depend on Reynolds number. It is found that the recirculation region behind the cylinders is shorter than that of half cylinders placed on the wall representing the symmetry plane.
其他 2008-06-09

边界层流动中边界层显微速度矢量场检测方案(CCD相机)
采用LaVision公司的ImagerSX4M相机，两套Infnity K2, DistaMax型长工作距离显微镜，对3.246mm x 3.874mm的视场进行了流场测量。获得了温度驱动的边界层流动的可视化流场。
其他 2017-02-09
流体中速度场检测方案(粒子图像测速)
Particle image velocimetry (PIV) experiments have been carried out to study the correlation between the high- Reynolds number turbulent flow and wall heat transfer characteristics in a two-pass square channel with a smooth wall and a 90 rib-roughened wall. Detailed averaged velocity distributions and turbulent kinetic energy for both the main and the secondary flows are given for a representative Reynolds number (Re) of 30,000. The PIV measurement results were compared with the heat transfer experimental data of Ekkad and Han [International Journal of Heat Mass Transfer 40 (11) (1997) 2525–2537]. The result shows that the flow impingement is the primary factor for the two-pass square channel heat transfer enhancement rather than the flow turbulence level itself. The characteristics of the secondary flow,for example,vortex’s shape, strength,rotating-direction and positions, are closely correlated with the wall heat transfer enhancements for both smooth and ribbed wall two-pass square channels. The rib-induced flow turbulence increases the heat transfer mainly because of the enhanced local flow impingement near the rib.
其他 2013-05-05
发动机中流场,速度场检测方案(粒子图像测速)
1.The HARVEST Project 2.2D-2C PIV Measurements 3.NumericalComputation 4.Results 1.ComparisonsPIV / CFD 2.Characterizationof dynamicstall 5.Conclusions ---------------------------------------------------------- Objective:Convertcineticenergyof riversor of tidal flow Specificity:Vertical axis turbine, radial flux, new generationof Darrieusand Gorlovturbine
其他 2012-07-19
流体中PIV,粒子成像测速,流体图像,小波分析检测方案(粒子图像测速)
Flow past a cylinder in an unbound medium gives rise to self-sustained, limit cycle oscillations involving formation of a regular, periodically alternating Karman vortex street. However, little attention has been paid to the effect of an adjacent free surface on the development of the Karman vortices and possible generation of new classes of the nearwake structure[1], see Figure 1. The technique of Particle Image Velocimetry (PIV) is a useful tool to this flow, considering that it is unsteady and multi-scale in nature.
其他 2012-02-03

轴流式血泵中速度场检测方案(CCD相机)
采用LaVision的图像采集和处理软件平台以及LDY300型双脉冲PIV激光器，ImagerProSX 5M 型双帧双爆光相机，构成一套粒子成像测速系统（PIV) ，并利用该系统对轴流式血泵在三种工况下流场特性进行了实验研究
医疗/卫生 2019-08-13
驱动形状记忆泡沫塑料中速度场,速度矢量场检测方案(粒子图像测速)
Shape memory polymer foams may be used to treat vascular aneurysms through thermal actuation of the foam from a compacted to an expanded configuration within the aneurysm structure, thereby alleviating blood pressure on the weakened aneurysm walls and reducing potential for rupture. After delivery to the aneurysm site, fiber-delivered laser light absorbed by the foam structure is converted into thermal energy, and actuation of the foam results. Introduction of nonphysiological energy into the body during foam actuation necessitates an evaluation of potential thermal damage to nearby tissue. In the present investigation, the foam is idealized as a heat-dissipating, volumetrically static object centered in a straight tube of flowing water. Velocity profiles around the heat-dissipating device are acquired experimentally with particle image velocimetry. A computational fluid dynamics package is then used to predict the experimental velocity profiles and temperature distributions by numerical solution of the Navier-Stokes and energy equations, and agreement between the computational solution and experimental results is assessed. Discussion of this assessment, as well as several preliminary procedures leading up to the creation of the heat-dissipating device and critical analysis of the methods employed, is also given. PIV and CFD are found to be in reasonable agreement with one another. Using laser-induced fluorescence as a temperature measurement modality, which is discussed in the text insofar as the technique was attempted several times and failed, together with PIV and CFD provides a formidable array of techniques exists to characterize flow around a heated device.
医疗/卫生 2011-03-27
血小板,双瓣尖人工心脏瓣膜,凝血趋势,新型体外流动系统中流场速度场,速度矢量场检测方案(粒子图像测速)
Thromboembolic events caused by implanted cardiovascular devices present serious challenges to surgeons and researchers alike. In particular bileaflet mechanical heart valves are prone to thrombus formation in the hinge region due to a combination of high shear stress and stagnation regions. Shear-induced platelet activation and aggregation is usually studied using viscometers, parallel plate flow, and other non-physiologic in vitro configurations. However, it is desirable to study this phenomenon in a more physiological environment.
医疗/卫生 2008-06-15

拖曳水池,船舶模型中速度矢量场,速度场检测方案(粒子图像测速)
In January 2004, Memorial University purchased a stereoscopic Particle Image Velocimetry (PIV) system for making flow measurements. Although the system was potentially very versatile, its primary application was envisioned to be in a towing tank. The system was supplied as a complete package of hardware and software for calibration, data collection and analysis. The intention of the PIV system designers was to collect as many data frames as possible for a fixed measurement plane location, relative to the model. This required the PIV system to be fixed on the towing carriage, moving with the model being studied. It was found during some preliminary experiments that an active seeding delivery system was necessary to ensure sufficiently high seeding particle concentration, especially when measuring flow velocities around a model hull with a large yaw angle. This paper describes the development of a seeding technique for a PIV system that can be used in a towing tank. The paper also includes an estimate of the uncertainty of the measurement system, including the analysis of the flow behind the device used to deliver seed particles into the flow.
交通 2008-06-16
流体中速度场检测方案(粒子图像测速)
This paper presents an experimental study on wave interactions with a rectangular barge in a beam sea condition. Regular waves with a wave period the same as the natural frequency of the barge were used in the experiments due to the fact that the barge is prone to capsizing under such waves. The barge was fixed on the free surface and no wave overtopping was assumed. Particle Image Velocimetry (PIV) was employed to measure the full-field two-dimensional velocity. Since the flow is highly turbulent, the phase-averaging technique was used to the extract the mean flow and turbulence properties. The mean flow pattern, including velocity, vorticity, and streamline, was analyzed to quantify the mechanism of the interactions. The generation and evolution of vorticity and turbulence kinetic energy were demonstrated.The turbulent kinetic energy is found to highly correlate with the vorticity field
交通 2008-02-11

山体,山崩中速度矢量场,脉冲波动检测方案(粒子图像测速)
Large scale digital particle image velocimetry (PIV) and laser speckle velocimetry (LSV) are applied to landslide generated impulse waves. The challenges posed to the measurement techniques in an extremely unsteady three phase flow consisting of granular matter, air and water are considered. Areas of interest up to 0.8 m by 0.8 m are investigated in the impulse wave generation zone. The complex flow phenomena present in the first stage of impulse wave initiation are: High speed granular slide impact, impulse flux transfer, flow separation and reattachement, cavity formation and collapse, slide deformation and penetration into fluid. During this first stage the three phases are separated along sharp interfaces changing significantly within time and space. A combined analysis method for PIV in water flow and LSV on the corona of the landslide surface is presented. Digital masking techniques are applied to distinguish between phases thereafter allowing phase separated image processing. The combination of PIV and LSV reveals insight into the impulse transfer mechanism. Applicability of PIV at large scale as well as to flows with large velocity gradients due to the presence of a strong shock are highlighted. An introductory vector-field obtained by means of PIV is shown in Fig. 1 with flow reattachement and characteristic saddle point above slide shoulder. Subsequent wave generation stages with granulate detrainment, bubble break up and massive phase mixing are not considered here.
地矿 2008-06-22

系留球体尾中3D3C 层析PIV检测方案(CCD相机)
采用德国LaVision公司的软件平台和四台Imager SX 4M型CCD相机。构成一套层析PIV处理系统。并利用这样的系统对受到漩涡诱导振动（VIV）影响的系留球体尾流进行了Tomo-PIV测量。
航空航天 2019-08-06

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Imager SX PIV相机信息由北京欧兰科技发展有限公司为您提供，如您想了解更多关于Imager SX PIV相机报价、型号、参数等信息，欧兰科技客服电话：400-860-5168转1446，欢迎来电或留言咨询。

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