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首页> 外文会议>Selected Papers from the 9th International Symposium on Laser Techniques Applied to Fluid Mechanics Lisbon, Portugal, July 13-16, 1998 >I.7. A new approach to eliminate the measurement volume effect in PDA measurements
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I.7. A new approach to eliminate the measurement volume effect in PDA measurements

机译：I.7。消除PDA测量中的测量体积影响的新方法

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摘要

A new model of phase-size correlation was introduced to improve the accuracy of sizing large particles in two-phase flows. This model takes both the refractive and reflective mechanisms into consideration and, hence, relaxes the assumption of single scattering mechanism in conventional phase-Doppler anemometry. As a results, the Gaussain beam defect and slit effect is eliminated. This method will need a tree-detector PDA system to determine the phases of Doppler signals scattered from a spherical particle in the measurement volume. The results of simulations based on this new method using the Generalized Lorenz Mie Theory (GLMT) were compared with those based on the conventional method. The results of simulation show that the newly developed method can greatly reduce the Gaussian beam defect and the slit effect in a PDA system.
机译：引入了一种新的相大小相关模型，以提高两相流中大颗粒尺寸的准确性。该模型同时考虑了折射和反射机制，因此放宽了传统相位多普勒风速计中单一散射机制的假设。结果，消除了高斯光束的缺陷和狭缝效应。该方法将需要一个树木探测器PDA系统来确定从测量空间中的球形粒子散射的多普勒信号的相位。将使用广义Lorenz Mie理论（GLMT）的基于该新方法的仿真结果与基于常规方法的仿真结果进行了比较。仿真结果表明，新开发的方法可以大大降低PDA系统中的高斯光束缺陷和狭缝效应。

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