Modified Zweifel Coefficient and Lift Coefficient Definition Considering Compressible Effect

Ni, Ming1,2; Wei, Zuojun1,2; Deng, Weimin1,2; Ren, Guangming1,2; Gan, Xiaohua1,2

2024-08-01

10.3390/aerospace11080650

AEROSPACE   影响因子和分区

2226-4310

The accurate prediction of blade loading is crucial to designing efficient turbomachinery, but traditional methods often neglect the impact of compressibility, leading to inaccuracies at high speeds. This study investigates the effect of compressibility on the blade loading parameters, particularly the Zweifel coefficient (Zw) and lift coefficient (CL), in turbine cascades. A novel intermediate method (IM), with averaged flow properties derived from both inlet and outlet conditions, is proposed to enhance the accuracy of Zw and CL calculations in compressible flow regimes. This method is based on the extended Kutta-Joukowski theorem for compressible flow and incorporates the Mach number directly into the modified definitions of Zw and CL. The analysis reveals that the averaged flow angle (alpha m), calculated by using a velocity-weighted approach, serves as a crucial parameter for blade similarity studies. The proposed correction method is applied and validated based on CFD simulations of the VKI-RG turbine cascade. The IM and modified definitions provide a robust framework for accurately predicting blade loading at high speeds, enabling improved design and analysis of turbomachinery.

blade loading lift coefficient compressible effect Mach number Zweifel coefficient cascade modular design

SCI

英语

第一 ; 通讯

Shenzhen Key Project of Basic Research[JCYJ20200109141403840] ; Shenzhen Key Laboratory Preparation Start-up Project[ZDSYS20220527171405012] ; null[52106045]

Engineering

Engineering, Aerospace

WOS:001305341100001

MDPI

Web of Science

1.Southern Univ Sci & Technol, Coll Engn, Dept Mech & Aerosp Engn, Shenzhen 518055, Peoples R China
2.Southern Univ Sci & Technol, Shenzhen Key Lab Wide Speed Range & Variable Dens, Shenzhen 518055, Peoples R China

Ni, Ming,Wei, Zuojun,Deng, Weimin,et al. Modified Zweifel Coefficient and Lift Coefficient Definition Considering Compressible Effect[J]. AEROSPACE,2024,11(8).

Ni, Ming,Wei, Zuojun,Deng, Weimin,Ren, Guangming,&Gan, Xiaohua.(2024).Modified Zweifel Coefficient and Lift Coefficient Definition Considering Compressible Effect.AEROSPACE,11(8).

Ni, Ming,et al."Modified Zweifel Coefficient and Lift Coefficient Definition Considering Compressible Effect".AEROSPACE 11.8(2024).