【摘要】 通过考察旋翼洗流对发动机喷流的影响来研究直升机发动机喷流的流动形式 .首先应用自由尾流分析技术来计算旋翼尾迹和发动机绕排流空间的洗流速度 .然后计算发动机的喷流轨迹 ,喷流截面形状和喷流物理参量 ,所得结果可以为预测直升机的温度分布提供参考更多还原

【Abstract】 An analytical method to predict the effects of rotor downwash on engine jet was proposed to investigate the flow pattern of helicopter engine jet. First, free wake analysis was carried out to calculate the rotor wake geometry and the downwash around the engine jet space. Then engine jet path, cross section shape and physical variants were calculated and analysed. Finally, an example was given to show that the method can be used to predict temperature distribution of a helicopter.更多还原