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复合发动机预冷器以其轻质紧凑的结构且高效的传热性能逐渐应用于超音速飞机发动机中,研究高流速高温差极端环境下微小尺度紧凑结构内换热机理对于提高发动机性能具有重大意义。本文针对Sabre复合发动机的预冷器,建立三维稳态可压缩流体横掠叉排管束的强制对流换热模型,研究管内流体速度,管外流体速度,入射角度以及管间距对于管外空气换热性能的影响机制。结果表明,通过增大管内制冷介质的流量,缩小管间距以及空气垂直入射等几种手段,均能达到提高预冷器换热效率的效果。
The composite engine precooler is gradually applied to supersonic aircraft engines because of its lightweight and compact structure and efficient heat transfer performance. It is of great significance to study the mechanism of heat transfer in a compact and compact structure with extreme high temperature and high temperature difference in extreme environments . In this paper, the forced convection heat transfer model of a three-dimensional steady-state compressible fluid cross-over tube bundle is established for the precooler of Saber composite engine. The velocity of the fluid in the tube, the velocity of the fluid outside the tube, the angle of incidence, Mechanism of performance impact. The results show that the effect of increasing the heat exchange efficiency of the precooler can be achieved by increasing the flow of refrigerant in the tube, narrowing the tube spacing and vertical incidence of air.