Effects of dimples with different depths in a highly loaded compressor cascade

YANG Yi; LU Hua-wei; GUO Shuang; PANG Wen-xuan; WANG Yu; ZHONG Jing-jun

doi:10.16411/j.cnki.issn1006-7736.2018.04.013

Journal of Dalian Maritime University >

2018 , Vol. 44 >Issue 4: 83 - 91

DOI: https://doi.org/10.16411/j.cnki.issn1006-7736.2018.04.013

Effects of dimples with different depths in a highly loaded compressor cascade

YANG Yi ,
LU Hua-wei ,
GUO Shuang ,
PANG Wen-xuan ,
WANG Yu ,
ZHONG Jing-jun

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(1. Naval Architecture & Ocean Engineering College, Dalian Maritime University, Dalian 116026, China;2. School of Aeronautics and Astronautics, Dalian University of Technology, Dalian 116024, China)

Received date: 2018-05-03

Revised date: 2018-05-25

Online published: 2018-05-31

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Abstract

Inspired by idea of “bionics”, this paper attempted to apply the nonsmooth shape of spherical dimples to the suction surface of a typical highly loaded compressor cascade to explore its influence on the flow characteristics of the cascade. Four rows dimples with depths of 0.2 mm~0.6 mm at the 38 %~60 % chord length on the suction side were selected as research object, and the Reynolds averaged method based on experimental verification was used for steady calculation. Results show that the array of dimples can effectively eliminate the separation bubble along the direction of blade spanning, and make the streamwise separation position of corner region move to the trailing edge of the blade at the same time. Under the designed Mach number, the dimple also inhibits the migration of passage vortex along the spanwise direction, simplifying the vortex structure in the corner zone. Based on the above reasons, the five kinds of dimples arranged upstream from the separation region can effectively reduce the total pressure loss at the exit of cascade, and the maximum loss reduction is up to 10.8 %. Additionally, the flow loss shows an increasing trend with the increase of dimple depth.

Key words： dimple; highly loaded compressor cascade; vortex structure; flow loss

Cite this article

YANG Yi , LU Hua-wei , GUO Shuang , PANG Wen-xuan , WANG Yu , ZHONG Jing-jun . Effects of dimples with different depths in a highly loaded compressor cascade[J]. Journal of Dalian Maritime University, 2018 , 44(4) : 83 -91 . DOI: 10.16411/j.cnki.issn1006-7736.2018.04.013

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