三维立体PIV

报价

¥100万 - 120万

暂无评分

品牌

LaVision GmbH

样本

暂无样本

型号

FlowMaster® 3D

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

留言询价电话询价

核心参数

测量效果： 平面（二位/三维）

产地类别： 进口

测量频率： 高频（100 HZ以上）

测速范围： 0-3km/s

测定准确度： 1%

测量区域大小： 1mx1m

相关方案

综合其他医疗/卫生交通能源/新能源农/林/牧/渔

流场中3D3C速度矢量场检测方案
Tomographic PIV as a full volume 3D-3C flow field measurement technique can also be applied to thin sheets used in standard PIV. Tomographic PIV and Stereo PIV are compared with experimental data from an impinging jet in water. The field of view is 60 mm x 40 mm, the light sheet thickness is varied from 8 to 55 pixel. Images have been recorded with 4 cameras to gain results from two independent Stereo PIV systems and from Tomographic PIV using 2-4 cameras. Different error sources for both techniques are quantified. It is shown that instantaneous flow fields from Tomographic PIV deviate less from each of the two stereo systems, than the two stereo systems deviate from each other. A systematic error pattern is identified for the two stereo systems, which is not present for Tomographic PIV. Thin volume Tomographic PIV allows the calculation of multiple vector planes. Two planes can be calculated even for the thinnest light sheet (8 pixel) providing the full 3x3 strain-tensor. Thicker sheets with up to twelve vector planes allow the visualization of the small vortex structures in this experiment.
其他 2012-07-16
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
通用襟翼模型中冷喷射漩涡的相互作用检测方案(粒子图像测速)
As part of the FARWAKE project, subtask 2.1.1, wake vortex flow experiments are performed using the PIV measurement technique in a water tank. The wake generating model consists of a simple wing/flap model that can be equipped with water jets to simulate propulsion effects. The model was tested at a speed of 3m/s and two angles of attack: 0and 6. Chord Reynolds number of approximately 225.000 and Vortex Reynolds numbers of approximately 150.000 and 220.000 were obtained during the tests. The main objective of the present study is to investigate the influence of a jet on the flap end vortex and the wake vortex formation. The investigation focuses on the direct influence of the jet on the flap end vortex and the (merged) vortex characteristics in the near to mid field. The main vortex characteristics addressed in this report are: the vortex trajectory, the maximum tangential velocity, the peak vorticity and the vortex core radius. The vortex information is obtained from Stereo-PIV experiments performed in a fixed plane perpendicular to the towing direction. The measurements return the 3 components of the velocity in that plane and the streamwise component of the wake vorticity. A submergible moving camera system is used in order to keep the moving vortex in the field of view during the vortex downward motion.
其他 2012-07-07
螺旋桨,尾流中速度场检测方案(粒子图像测速)
Ship laboratory has specific components for underwater measurements 􀁺 system used for phase-locked measurements behind the propeller for a twin-screw vessel 􀁺 the purpose of the study has been to − gain information on the interaction of the propeller and the rudder − explore the capabilities of the measurement system
交通 2010-10-31

瞬态平面压力中瞬态平面压力检测方案
Forces on flapping or rotating wings, like flapping wings of micro air vehicles or blades of wind turbines are of great interest to engineers. To investigate the ways birds and insects fly, forces created by flapping wings are of importance to biologists. The pressure field, combined with the velocity field, gives a complete description of the (incompressible) flow dynamics. Furthermore the pressure field is the main contributor to the aerodynamic loading of bodies immersed in the fluid. Traditional techniques to determine pressure and forces rely on the determination of surface pressure and integral loads by point pressure and force balance measurements. In situations where it is difficult (or impossible) to instrument the body, using particle image velocimetry (PIV) velocity data to determine forces and pressure poses an interesting alternative to the existing approaches to determine sectional loading.
其他 2013-06-30
流体,喷雾,喷嘴中速度场检测方案
Experimental velocity measurements of a low-speed jet, performed using time-resolved tomographic PIV, are used to study the dynamics of large-scale structures and their sound radiation. The experimental results show the roll-up of axisymmetric vortices that pair downstream, and subsequently lose their azimuthal coherence. Models of linear instability waves using both steady laminar and mean-field base flows flow are applied. While good agreement can be obtained for the vortex roll-up frequency in the near-nozzle region using the laminar base flow, non-linear effects must be included, via the mean field, in order to capture the downstream evolution of both the fundamental and subharmonic (vortex pairing). The velocity fluctuations for both frequencies have a wave-packet structure with some jitter in the form of modulations of the spatial extent and amplitude of the envelope. The sound radiation is modelled using a jittering wave-packet model, an shows agreement with the exponential directivity shape of Laufer and Yen (J. Fluid Mech. 134, 1983).
其他 2013-06-30
预混和旋流燃烧器回火现象高速激光成像研究
Energy supply is one of the primary building blocks of our society. Worldwide, and especially in rapidly developing countries, e.g. China and India, the demands of energy for housing, industry, transportation and communication are constantly increasing [83]. The global energy supply is currently dominated by combustion of fossil fuels. In 2008, 85.1% of the global primary energy supply was produced from the combustion of oil (34.6%), coal (28.4%) and natural gas (22.1%). From the 12.4% of renewable energy sources, 82% (in total 10.2%) was bioenergy based on burning renewable rescources [45]. Recent reports confirm that a dramatic shift towards CO2 neutral energy supply is required to stop the current trend of global warming [135]. Nevertheless, the slow developement of renewable energies over the last decades as well as the absence of large technological advancements in nuclear fusion technology indicate that this structure will not substantially change in the coming decades. Besides emissions of CO2, further pollutants are formed during the combustion of fossil or biofuels. From these emissions, nitric oxides (NOx) have been identified as a major problem of practical combustion processes [214]. In the recent decades nitric oxides became a significant contributor to photochemical smog and ozone in urban air [180]. It further participates in the chain reaction removing ozone form the stratosphere with the consequence of increased ultraviolet radiation reaching earth’s surface [90]. NOx is generally formed during the oxidation process of nitrogen containing fuels such as coal and oil. However, the gross NOx emissions are created at high combustion temperatures from nitrogen in the air. These are typical for hard coal plants, internal combustion engines and gas turbines. Hence, it is essential to understand the physico-chemical processes of NOx formation and concepts to reduce or even eliminate NOx emissions.
其他 2013-06-30
空气流体中速度场检测方案
The flow at Reynolds number 100k around an inflexible, two-dimensional flapping airfoil is investigated using the stereoscopic Particle Image Velocimetry (PIV) technique. The typical phenomenon of a moving laminar separation bubble during one flapping cycle is identified. The measurement data is compared with URANS computations.
其他 2013-05-04

双瓣尖机械心脏瓣膜中2D3C速度矢量场检测方案(粒子图像测速)
采用LaVision公司的DaVis7.0.11图像数据采集和分析处理软件平台，两台 imager Pro CCD 相机，可编程时间控制单元PTU构成一套2D3C立体粒子成像测速系统，并利用该系统研究了被动流量控制在双瓣尖机械心脏瓣膜泄漏射流中的应用。
医疗/卫生 2019-08-19
脑动脉瘤中流体力学特性的影响研究检测方案(粒子图像测速)
Embolic coiling is the most popular endovascular treatment available for cerebral aneurysms. Nevertheless, the embolic coiling of wide-neck aneurysms is challenging and, in many cases, ineffective. Use of highly porous stents to support coiling of wide-neck aneurysms has become a common procedure in recent years. Several studies have also demonstrated that high porosity stents alone can significantly alter aneurysmal hemodynamics, but differences among different stent configurations have not been fully characterized. As a result, it is usually unclear which stent configuration is optimal for treatment. In this paper, we present a flow study that elucidates the influence of stent configuration on cerebral aneurysm fluid dynamics in an idealized wide-neck basilar tip aneurysm model. Aneurysmal fluid dynamics for three different stent configurations (half-Y, Y and, cross-bar) were first quantified using particle image velocimetry and then compared. Computational fluid dynamics (CFD) simulations were also conducted for selected stent configurations to facilitate validation and provide more detailed characterizations of the fluid dynamics promoted by different stent configurations. In vitro results showed that the Y stent configuration reduced cross-neck flow most significantly, while the cross-bar configuration reduced velocity magnitudes within the aneurysmal sac most significantly. The half-Y configuration led to increased velocity magnitudes within the aneurysmal sac at high parent-vessel flow rates. Experimental results were in strong agreement with CFD simulations. Simulated results indicated that differences in fluid dynamic performance among the different stent configurations can be attributed primarily to protruding struts within the bifurcation region.
医疗/卫生 2012-07-30

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
螺旋桨,尾流中速度场检测方案(粒子图像测速)
Ship laboratory has specific components for underwater measurements 􀁺 system used for phase-locked measurements behind the propeller for a twin-screw vessel 􀁺 the purpose of the study has been to − gain information on the interaction of the propeller and the rudder − explore the capabilities of the measurement system
交通 2010-10-31

涡流火焰中速度场,OH-PLIF检测方案(粒子图像测速)
采用LaVision的时间分辨激光诱导荧光火焰分析系统FlameMaster-TR和2D3C时间分辨立体PIV测速系统，对应变速率、局部熄灭和流体力学不稳定性对附着和上升涡流火焰过渡的影响进行了实验测量研究。
能源/新能源 2019-12-11

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

典型用户

用户单位	采购时间
江苏大学	2015-11-02
上海交通大学	2012-11-01
清华大学	2004-11-01
北京大学	2009-09-01