液力变矩器泵轮内部流动PIV测试与分析

PIV test and analysis on pump internal flow of torque converter

为了能够设计出性能优良的液力变矩器,合理利用内部流动规律来提高效率,更好地分析其内部流动情况,利用有机玻璃来制作液力变矩器的模型,进而增加模型的透明性,实现液力变矩器泵轮内部流动的可视化,采用激光粒子测速技术(particle image velocimetry,PIV)对液力变矩器泵轮内部流场进行测试.针对不同工况下的液力变矩器泵轮内部流场进行试验,采集了其内部流场在制动工况(i=0)、牵引工况(i=i*)和空载工况(i=1)的径向和轴向的流动二维图像,并作了定性分析.结果表明:通过采集的图像可清晰地看到代表液流流动的示踪粒子的速度大小和方向;利用PIV测试技术测量液力变矩器内部流场是可行的.

In order to design hydrodynamic torque converter with high perfomance and improve efficiency by internal flow law to better analyze the internal flow, organic glass was used to prepare the model of hy- draulic torque converter. The transparency was improved by the model to achieve visualization of internal flow field in pump. Particle image velocimtry （PIV） was used to measure the internal flow field at diffe- rent working conditions with the braking condition of i = 0 , the traction of i = i＊ and the no-load condition of i = 1. The radial and axial flow images were acquired and analyzed qualitatively. The results show that the velocity and direction of tracer particles on behalf of fluid flow can be seen clearly from the col- lected images. It is feasible to test the internal flow field of the pump by PIV.