航空发动机静止盘腔瞬态特性数值与实验研究

Numerical and Experimental Investigation of Transient Response of Static Disc Cavity in Aero-Engine

关键词:  静止盘腔  瞬态响应  评价参数  数值计算  实验研究

Key words:  Static disc cavity  Transient response  Evaluation parameters  Numerical simulation  Experimental test

摘要:

为了研究静止盘腔瞬态响应过程和参数响应规律，本文分别采用非定常雷诺时均方法和实验手段对典型静止盘腔的瞬态响应特性进行研究，通过对盘腔响应过程的分析，引入三个评价参数，对静止盘腔瞬态特性进行定量分析。对比研究了不同进出口边界条件下的静止盘腔瞬态响应特征，在相同瞬变工况下，有一个进口和一个出口的静止腔响应速度最慢，响应时间最长为4.57s，而有一个进口和两个出口的腔室响应时间最短为2.13s。研究表明，本文建立的非稳态数值模拟方法能够准确预测静止盘腔内的流动过程，反映静止盘腔的瞬态响应特性，而进出口几何条件对静止盘腔的响应特性有显著的影响。

Abstract:

In order to study the transient response process and the variation of flow parameters of the static disc cavity，the transient response characteristics of a typical stationary disk cavity were studied using the Unsteady Reynolds-Averaged Navier-Stokes method and experimental methods，respectively. Through the analysis of the response process in cavity，three evaluation parameters were introduced to quantitatively analyze the transient characteristics of the stationary disk cavity. The comparative research of the transient response characteristics of the stationary disk cavity was carried out under different inlet and outlet boundary conditions. In the same transient conditions，it is found that the response of the cavity with one inlet and one outlet is the slowest and its longest response time is 4.57s，while the cavity with one inlet and two outlets has the shortest response time of 2.13s. The research shows that the unsteady numerical simulation method established in this paper can accurately predict the flow process in the stationary disk cavity and reflect the response characteristics，and the geometry of the inlet and outlet has a significant effect on the response characteristics of the stationary disk cavity.