| Citation: | LI Xiang, CHI Zhidong, WANG Shimin, et al. Influence of riblet structure on loss and stall of cascade at low Reynolds numbers[J]. Journal of Aerospace Power, 2025, 40（9）：20240373 doi: 10.13224/j.cnki.jasp.20240373
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To broaden the effective attack angle range of the blade cascade under the influence of low Reynolds number and achieve the purpose of blade cascade expansion and loss reduction, numerical and experimental researches on a small deflection angle diffuser blade cascade were conducted. Three riblet-structures with different angles were selected to control it by studying the main characteristics of turbulence after blade stall. The research results indicated that diffusion type surface ridges are an effective means to expand the effective attack angle of the blade cascade and reduce losses. Its characteristic was represented by expanding the positive stall boundary without sacrificing the loss of the design angle of attack, with a maximum reduction of 17.7%. No-angle riblets achieved reduction at a high angle of attack, with a maximum reduction rate of 19.58%. Overall, the reduction effect of diffusion type riblets was better than that of non-angle riblets and better than that of convergence type riblets. In addition, it was found that the width and peak loss of the wake decreased after reduction, and the diffusion line of the wake shifted towards the pressure surface side.
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