亚音速涵道式冲压空气涡轮性能数值仿真

Numerical Simulation of Performance of Subsonic Ducted Ram Air Turbine

空中加油吊仓多采用"涵道式冲压空气涡轮"(Ducted Ram Air Turbine,以下简称DRAT)作为动力装置。空气涡轮性能的优劣直接影响DRAT的工作性能。为了对吊仓飞行高度以及飞行表速对空气涡轮性能影响进行研究,找到减少涡轮流动损失,提高系统的输出功率和效率的方法。采用NUMECA软件对涡轮流动进行叶轮机械数值仿真,对涡轮飞行包线内性能变化进行分析,得到了涡轮在飞行包线内的最小功率点和对应的最小功率,并通过对空气涡轮性能分析,建立一套关于空气涡轮性能的可行和实用的数值仿真方法。

Air - to - air refueling pod usually utilizes ＂Ducted Ram Air Turbine＂ as power system. The perform- ance of the turbine has a direct impact on the work of air - to - air refueling pod. In order to draw a corresponding conclusion that, performance of DRAT varies with flight height and velocity for finding a method to reduce turbine flow losses and improve the output power and efficiency, this paper simulates the DRAT system with commercial CFD software NUMECA, analyses the change of performance in flight envelope. The minimum power point is found and the corresponding minimum power is calculated. Through the air turbine performance analysis, a feasible and practical numerical simulation method is established to analyze the performance of DRAT.