Volume 37, Number 3, June 2019
|Page(s)||565 - 571|
|Published online||20 September 2019|
Numerical Investigation of Powered Jet Effects by RANS/LES Hybrid Methods
Institute of Engineering System of CAEP, Mianyang 621900, China
2 School of Aeronautics, Northwestern Polytechnical University, Xi’an, 710072, China
For the high-precision simulation of engine jet effects, an improved delayed detached eddy simulation (IDDES) method based on the two-equation shear stress transport (SST) model is developed, and the fifth-order finite-volume weighted essentially non-oscillatory (WENO) scheme is employed to enhance accuracy of spatial discretization, and then numerical investigation of powered jet effects by RANS/LES hybrid methods is carried out. The effects of the grid distributions and the accuracy of the spatial schemes are discussed during the RANS/LES validation analysis on the fully expanded jet flow and Acoustic Reference Nozzle (ARN) jet flow. The results show that, by enlarging the grid density and improving the accuracy of the spatial schemes, the velocity distributions in the jet flow can be better predicted, the non-physical steady flow after the jet nozzle can be shortened, the instantaneous flow structures are clearer and the turbulent intensities are more accurate. Then IDDES simulation of turbofan engine jet flow is carried out. The mixing characteristics of the external fan jet flow and internal core jet flow as well as the ambient flow are obtained, and the three-dimensional turbulent structures are also given.
Key words: engine jet effects / IDDES hybrid method / accuracy of spatial discretization / grid density / turbulent structure / velocity distribution / nozzle / numerical simulation
关键字 : 动力喷流效应 / IDDES混合方法 / 空间离散格式精度 / 网格密度
© 2019 Journal of Northwestern Polytechnical University. All rights reserved.
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