The Numerical Simulation of Jet Mixing With Steady and Antisymmetric Pulsed Jets in Different Frequency

2016 2nd International Conference on Mechanical and Aeronautical Engineering (ICMAE 2016)

机械制造;航空航天工程

Zhang, R.B.^1 ; Hong, L.^1

School of Energy and Power Engineering, Beihang University, XueYuan Road, HaiDian District, Beijing

100191, China^1

关键词: Anti-symmetric;    Axial velocity;    Different frequency;    Interfacial areas;    Mass flow ratios;    Parametric study;    Pulse frequencies;    RANS simulation;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/187/1/012012/pdf
DOI  :  10.1088/1757-899X/187/1/012012

学科分类：航空航天科学

来源: IOP

【 摘 要 】

A parametric study of the effect of rectangular antisymmetric pulsed control jets on the jet mixing with different pulse frequency is conducted using RANS simulation. The mean centerline potential core length and the axial velocity contours of the main jet at different downstream positions (x/D) is investigated and discussed in detail. When the antisymmetric pulsed control jets are injected into the main flow, a starting vortex is observed in the axial velocity contours on x-z plane, which does not exist when the control jets are symmetric steady (St=0). The factors that have effect on the jet mixing are analyzed and described in detail, and the jet/ambient air interfacial area is found to play an important role in jet mixing. The best mixing effect can be reached at the same mass flow ratio of the main flow to the control jets if a proper pulse frequency of the control jets is used.