热声制冷机网络模型中回热器H矩阵参数的测量

H matrix parameters measurement for regenerator of thermoacoustic system

对热声系统的网络模型中回热器H矩阵的参数进行了分析,提出了一种H矩阵参数的测量方法。通过实验对简单圆管的无源网络进行测量,与模拟值有较好的吻合,证明实验系统是可靠的。在改变压力和频率的条件下对有源的热声制冷机回热器进行了测量和分析,模拟的结果与测量值基本上一致,流放大系数与模拟的结果偏差较大。说明热声系统是复杂的非线性系统,在线性假设前提下的热声网络模型的模拟结果会存在一定的偏差,尤其在大振幅条件下需要对网络参数进行测量和辨识,通过对网络参数的修正提高模拟的准确性。

A new method was developed to measure H matrix parameters of thermoacoustic regenerator. two-transducer method for measuring the acoustic power flow down a duct was developed,which was proved valid for travelling system or high-wave ratio thermoacoustic engines. The H matrix parameters were tested and analyzed to the non-active network model and active network model. Test results show that this method was valid for predicting the system＇ s dynamic behavior. But more work should be done to revise the H matrix parameter based on measurement.