冷却介质在层板内流动特性研究(第一部分 利用粒子图像测速技术再现复杂流场)

An investigation of coolant flow performance within laminated plate (Ⅰ Visualization of complex flow field using PIV technology)

探讨利用粒子图像测速(PIV)技术,实验研究冷却介质在层板内部流动特性的可行性。实验在满足相似性原理的前提下,用放大的有机玻璃模型,分区域再现了复杂结构内几个重要截面的二维流场。实验在雷诺数4.1×104下进行,从测量所得流体速度矢量图、等高线图及涡量图来看,虽然现有的PIV技术在测量精度上仍有欠缺,但是几个典型截面上所得到的实验结果是合理的,基本与本文第二部分展示的数值模拟结果相符合。因此利用PIV测速技术,验证层板内流数学模型和数值方法是有意义的。

The feasibility of experimental investigation on the flow performance of the fluid coolant within a double-wall laminated plate using particle image velocimetry technology （PIV） was discussed. The experiments were carried out by a magnified specimen made of transparent organic glass and fulfilling the comparability principle. Several two-dimensional flow fields with complex structures at some important cross sections of the laminated plate were visualized. The Reynolds number in this experiment is 4.1 ×10^4. From the experimental results such as velocity distributions, contours and vortex distributions, it can be drawn that although the measurement accuracy of the PIV technology is not high enough, the measurement results by the PIV at the important cross sections are reasonable, and basically in agreement with the numerical results presented in the second part of this paper. Therefore it is significant to utilize the PIV technology to validate the numerical model and method of the flow performance within the laminated plate.