Influence of Mach number on the off-design performance of S-shaped compressor transition duct under the combined effect of curvature and pressure gradient
参考中译:马赫数对S型压气机过渡道变时性能的影响


          

刊名：Australian Journal of Mechanical Engineering
作者：Manish Sharma（Mechanical Engineering Department, Madanapalle Institute of Technology & Science）
Beena D. Baloni（Mechanical Engineering Department, Sardar Vallabhbhai National Institute of Technology）
刊号：780UA055
ISSN：1448-4846
出版年：2024
年卷期：2024, vol.22, no.4
页码：704-717
总页数：14
分类号：TH
关键词：S-shaped compressor duct；Mach number；Pressure coefficient；Pressure intensity
参考中译：S形压缩机气道;马赫数;压力系数;压力强度
语种：eng
文摘：The compressor transition duct transfers the air from the low-pressure compressor to the high-pressure compressor. An aircraft always experiences off-design conditions except for level flight conditions during aircraft range. So, to throw some light on the performance of transition ducts under off-design conditions, this paper presents its performance assessment numerically for uniform and swirl flow cases under varying Mach numbers (M). This analysis reveals that a higher Mach number provokes an adverse pressure gradient and non-uniformity. In the uniform flow, the non-uniformity attains a maximum value of 0.04366 near the inner wall, which indicates the presence of a highly distorted flow near the inner wall; however, its maximum value is 0.03661 near to the outer wall in the swirl flow. Also, the pressure recovery reduces with an increased Mach number. Notably, as the Mach number increasesfrom the design point, the pressure coefficient along the convex curvature significantly drops to the lowest point of -0.65015 and -0.79324 for uniform and swirl flow, respectively. Consequently, the inner wall experiences a large adverse pressure gradient (-0.90822) compared to the decreasing Mach number from the design point for the uniform flow, whereas it is experienced by the outer wall in the case of swirl flow (-0.94729).
参考中译：压缩机过渡管道将空气从低压压缩机输送到高压压缩机。除了在航程内的水平飞行条件外，飞机总是经历非设计状态。因此，为了了解过渡通道在非设计条件下的性能，本文对均匀和旋流两种情况下的过渡通道在不同马赫数(M)下的性能进行了数值评估。这一分析表明，较高的马赫数会引起不利的压力梯度和不均匀。在均匀流中，非均匀性在内壁附近达到最大值0.04366，这表明在内壁附近存在高度扭曲的流动；而在旋流中，其最大值在外壁附近为0.03661。此外，随着马赫数的增加，压力回复率减小。值得注意的是，随着马赫数从设计点的增加，沿凸曲率方向的压力系数显著下降，对于均匀流和旋流，压力系数分别为-0.65015和-0.79324。因此，在均匀流情况下，内壁经历了较大的逆压差(-0.90822)，而在旋流情况下，外壁经历了较大的马赫数下降(-0.94729)。



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