多容腔耦合的瞬态响应实验研究

To investigate the coupled transient characteristics for multi-cavities, a test rig was built composed of several cavities, several holes, and pipes, according to the structural characteristics of secondary air system. Also, three parameters, including the delay time, response time, responsing time coefficient, were introduced to quantitatively analyze the strength of the response process. The main effects were analyzed by experiments and the response curves and response time at different position were obtained. The experimental results show that the cavities capacity has a significant delay effects on the change of cavity pressure. The lagging time is quite different for the each test point, and it is longer for the one which is further away from the source. The rotating airflow can delay the change of the aerodynamic parameters. Under the experimental conditions, the rotation speed doubles, and the response time of the rotary disc increases by about 0.5s, the increase by more than ten percent.