矩形S弯扩压器内旋流的发展及其气动特性

SWIRL DEVELOPMENT AND FLOW CHARACTERISTICS IN A RECTANGULAR S-SHAPED DIFFUSER

关键词:  扩压器  进气道气流  旋涡  流场畸变

Key words:  Diffuser  Inlet flow  Swirl  Flow distortion

摘要:

通过对矩形Ｓ弯扩压器内流动的详细观察和测量，给出了出口单涡旋流形成的条件及其发展过程、旋流与总压畸变图谱的关系等结果，从而进一步丰富了前人所得出的关于旋流的形成和发展的结论。

Abstract:

In this paper,swirl development in a rectangular S-shaped diffuser is described based on detail measurement of static pressure on walls, total pressure contour maps and velocities of secondary flow at exits of first and second bends. The conditions in which a bulk swirl exists at exit of the diffuser, and the relationship between swirls and contour maps of total pressure distortion are also given. The results show that the bulk swirls at the exit of the diffuser are closely related to the flow separation at the entrance of the diffuser and the core of bulk swirl corresPOnds to the area of low total pressure.