资料摘要
资料下载LaVision公司凭借多年积累的丰富经验并与行业内尖端科研用户紧密合作,设计研制出灵活、高性能PIV系统的知名品牌FlowMaster。 LaVision公司不断推出性能优异,引领行业发展的先进PIV算法和数据有效性检验法则。例如采用变形网格窗口技术进行相关运算,以及采用独特的局部中值滤波技术进行数据有效性判断的算法等。 1997: 推出业内首套商品化高灵敏度12位PIV CCD相机系统 1998: 在Lisbon会议上介绍3D立体PIV技术 同时两相流场的测量分析 1999: 开发了新的3D-PTV技术 集成了高分辨率2K X 2K PIV相机 2000: 时间分辨PIV系统,可以在时间及空间域对流体动力学结构 进行耦合效应分析 内窥式PIV系统 基于分子示踪方法的流动标识技术 2001: 微米级分辨率的显微PIV系统 基于立体PIV系统的双平面PIV系统,用于进行三维涡量及加速度 场的测量 2001- 2005: 连续三次(2001年,2003年,2005年)参加PIV challenge-世界范 围PIV/PTV软件算法评测活动并取得巨大成功 2004: 立体PIV自标定技术,该技术可以自动准确修正标定结果,即使标定靶 和激光片光之间的位置差异很大的情况也可以完成这样的修正 2005: FlowMaster MITAS系统:该系统提供了倒置显微镜及三维电动位移平 台,并提供所有硬件的计算机控制 2006: 体视三维层析PIV(Tomo-PIV)系统,即Tomographic PIV:一种全新 的瞬时三维速度场测量技术 2009: 首次演示4台1千6百万像素相机构成测量大体积流场的层析PIV系统 2010: 首次推出自适应PIV系统,进一步提高了PIV分析的精度和分辨率 用GPU(图形处理单元)进行PIV分析 首次采用最新一代sCMOS相机构建立体视层析-PIV系统 2011: 8台相机构成的层析-PIV系统,开创风洞中体视流场测量分辨率 的新记录 交付全球首套水下体视层析PIV系统 FlowMaster是为研究燃烧、喷射流动以及各种水力学和空气动力学领域内测量对象而设计的,激光片光照明成像系统大家族中的一员。用途广泛的FlowMaster系统型号架构应用为导向。模块化的、灵活的系统设计,可满足丰富的测量需求。
层析PIV
简介: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。
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
简介: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.
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
简介: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.
游动的未成熟海胆幼虫的个体发育变化和湍流中的取向
简介: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.
落到倾斜箔片上的液体薄膜流动的时间空间分辨热传导过程的实验研究
简介:This paper describes the development of an experimental technique that combines simultaneous planar laser-induced fluorescence (PLIF) and infrared (IR) thermography imaging, and its application to the measurement of unsteady and conjugate heat-transfer in harmonically forced, thin liquid-film flows falling under the action of gravity over an inclined electrically heated-foil substrate. Quantitative, spatiotemporally resolved and simultaneously conducted measurements are reported of the film thickness, film free-surface temperature, solid–liquid substrate interface temperature, and local/instantaneous heat flux exchanged with the heated substrate. Based on this information, local and instantaneous heat-transfer coefficients (HTCs) are recovered. Results concerning the local and instantaneous HTC and how this is correlated with the local and instantaneous film thickness suggest considerable heat-transfer enhancement relative to steady-flow predictions in the thinner film regions.
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