Numerical Study on the Influence of Bionic Arc-Shaped Micro-Grooves on the Aerodynamic Performance of Centrifugal Impellers

被引：0

作者：

Fan, Hongzhou ^{[1
]}

Lei, Weipeng ^{[1
]}

Yue, Bao ^{[2
]}

Zhang, Weijiang ^{[2
]}

Guo, Hongtao ^{[1
]}

Xi, Guang ^{[1
]}

机构：

[1] School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an

[2] Guangdong Midea HVAC Equipment Co., Ltd., Guangdong, Foshan

来源：

Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University | 2024年 / 58卷 / 10期

关键词：

aerodynamic performance; bionic arc micro-groove; centrifugal impeller; computer numerical control machining; isentropic efficiency;

D O I：

10.7652/xjtuxb202410008

中图分类号：

学科分类号：

摘要：

To enhance the aerodynamic performance and reduce flow losses of centrifugal impellers, a numerical study is conducted to explore the effects of biomimctic arc-shaped micro-grooves, inspired by shark skin micro-grooves and implemented through computer numerical control machining technology. The study focuses on the pressure and suction surfaces of the impeller blades. Different sizes of biomimctic arc-shaped micro-grooves are strategically placed at 50% of the blade height to determine the optimal groove size for improving the performance of the centrifugal impeller. Subsequently, the optimal-sized micro-grooves arc arranged at regular intervals along the blade height to assess the influence of the number of micro-grooves on the flow field and overall performance of the impeller. Furthermore, varying quantities of biomimctic arc-shaped micro-grooves are simultaneously positioned at different blade height intervals to further examine their impact on the aerodynamic performance. The numerical results reveal that micro-grooves with a relative width of 2% and a depth of 5% arc identified as the optimal dimensions for enhancing the performance of the centrifugal impeller. Arranging 13 and 16 micro-grooves with intervals of 7% and 6% of the blade height on the pressure and suction surfaces, respectively, yield significant improvements in the flow distribution at the impeller' s exit section and result in reduced flow losses. By concurrently incorporating the optimal-sized micro-grooves in optimal quantities on both the pressure and suction surfaces, the aerodynamic performance of the centrifugal impeller is further enhanced. Under the design conditions, the isentropic efficiency improves by 0. 63%, and the pressure ratio increases by 0. 40%. This study provides valuable insights for the design optimization and computer numerical control machining of centrifugal impellers. © 2024 Xi'an Jiaotong University. All rights reserved.

引用

页码：83 / 94

页数：11