极端降雨条件下航空发动机吞雨的数值研究

Numerical Study of Aeroengine Rain Swallowing under Extreme Rainfall Conditions

关键词:  航空发动机  极端降雨  吞雨量  数值模拟  欧拉-欧拉法

Key words:  Aero-engine  Extreme rainfall  Rain swallowing  Numerical simulation  Euler-Euler method

摘要:

为了探究极端降雨条件下发动机入口吞雨量，基于欧拉多相流模型，针对不同涵道比发动机，选取不同降雨强度、攻角及飞行阶段进行计算，分析不同条件对于发动机入口吞雨量的影响，并将计算所得结果与国军标中对于吞水的试验条件进行对比。计算结果表明，发动机入口吞雨量会随着降雨强度和飞行速度的增大而增大，但攻角变化对其影响较小。当降雨强度低于709.2mm/h时，发动机入口吞雨量始终低于国军标吞水试验条件中的入口流量最大值5%，能够保证飞行安全。但当降雨强度达到1872mm/h时，爬升阶段的吞雨量高于5%，可能存在安全隐患。

Abstract:

In order to investigate the engine inlet rain swallowing under extreme rainfall conditions， based on the Eulerian multiphase flow model， different rainfall intensities， angles of attack and flight phases were selected for different culvert ratio engines to analyze the effects of different conditions on engine inlet rain swallowing， and the calculated results were compared with the test conditions for water ingestion in the national military standard. The calculation results show that the engine inlet rain swallowing will increase with the increase of rainfall intensity and flight speed， and the angle of attack change has less effect on it. When the rainfall intensity is lower than 709.2mm/h， the engine inlet rain swallowing is always lower than 5% of the maximum inlet flow rate in the national military standard water ingestion test conditions， which can ensure flight safety. However， when the rainfall intensity reaches 1872mm/h， the rain swallowed during the climb phases is higher than 5%， which may be a safety hazard.