多容腔耦合的瞬态响应实验研究

An Experimental Analysis of Coupled Transient Response for Multi-Cavities

关键词:  航空发动机  空气系统  瞬态响应  多容腔  实验  旋转盘

摘要:

为了研究多容腔耦合的瞬态响应特性，结合航空发动机空气系统结构特点，搭建了包含容腔、管道、孔等多个元件组成的系统级实验台，并开展了实验研究。同时，引入滞后时间、响应时间和响应时间系数三个评价参数，用于定量分析系统响应过程的快慢和强弱。实验分析了多容腔耦合响应过程的主要影响因素，获得了不同位置气流压力的时间响应曲线以及响应时间。实验结果显示:容积效应对腔压的变化具有明显的延缓作用，并且每个测点的延迟时间不一致，越远离扰动源滞后时间越长；响应时间与扰动压力及转盘转速相关，扰动压力越高压力响应时间越长，旋转流动对气流参数的变化具有延缓作用，在实验工况下转速提高一倍，旋转盘响应时间增加约0.5s，增幅大于10%。

Abstract:

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.