Abstract
The effects of compressor aerodynamic parameters, such as pitch-chord ratio, aspect ratio, and fillet, on the cascade performance have been studied in this paper. Slot configuration at the root of the blade has been proved to be an efficient passive control method for the corner separation control in compressor cascade. The combined effects of the pitch-chord ratio, aspect ratio, and blade fillet with a slot configuration on the blade, have also been studied. Larger corner separation caused by the high pitch-chord ratio can be eliminated by the slot, which leads to fewer blades with almost the same or even better cascade performance. Various aspect ratios, together with the slot configuration, have been investigated and all of them have a positive effect on the cascade performance. For the blade with the blade fillet, the slot still has a positive effect on the control of the corner separation, while cascade performance with just a slot configuration is better than the slot configuration under the influence of the blade fillet.
Highlights
Corner separations always occur at the corner between the suction surface and the endwall, and are inherent flow features in compressors [1]
In the past few decades, many researchers have focused on understanding the mechanism of corner separation by experiment [2,3] or advanced numerical simulation methods (Delayed detached-eddy simulation (DDES) [4], hybrid LES/RANS [5], and Large eddy simulation (LES) [6])
Improvement of the the pitch‐chord ratio would would cause cause an of the Improvement of pitch-chord ratio an improvement improvement of the loading loading and and diffusion diffusion factor the corner separation in in thethe passage
Summary
Corner separations always occur at the corner between the suction surface and the endwall, and are inherent flow features in compressors [1]. In the mid-20th century, Zweifel et al [7] and Lieblein et al [8] identified that the pitch-chord ratio ( solidity) is an important feature in compressor design It strongly affects the flow turning angle, blade loading, and the available range of incidence angles. The magnitude of changes in solidity, aspect ratio, and blade fillet radius, combined with effect of slot configuration at the blade root has been investigated for a highly‐loaded can reduce, as well asThe control, the separation of the of the which cansolidity increaseand the compressor cascade. The magnitude of changes in solidity, aspect ratio, and blade fillet radius, combined with effect of slot configuration at the blade root has been investigated for a highly-loaded compressor. Model aspect (blade fillet), and the slot configuration influence the corner separation, the real geometrical and the overall performance of the cascade. A linear compressor cascade, which was tested in the Whittle laboratory of the University of Cambridge [26,27], has been selected for the investigation of the corner separation
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