等离子体气动效应对燃烧室流场的影响

Influence of Plasma Aerodynamic Effect on Chamber Flow Field

为了研究等离子体气动效应的内在机理,建立燃烧室助燃激励器中等离子体气动效应的数值仿真模型,通过求解电势方程和电荷密度方程,得到等离子体气动效应的体积力分布函数,将动量以源项的形式引入Navier-Stokes方程求解,对助燃激励器中等离子体气动效应诱导燃烧室空气流动进行了数值模拟,研究激励电压、气体流量和电荷密度对燃烧室中等离子体气动效应效果的影响。计算结果表明:在等离子体气动效应的作用下,燃烧室流场紊流度增大,速度分布不均匀;随着激励电压的升高,燃烧室轴向速度振荡幅度增大;等离子体气动效应对燃烧室流场的影响随着进口流速的增加不断减小;随着电荷密度的增加,火焰稳定器前后燃烧室流场轴向速度的振荡不断加剧。

We established a numerical simulation model of plasma aerodynamic effect in the combustion-supporting actuator of chamber in order to investigate the internal mechanism of plasma aerodynamic effect.We could obtain the body force distribution function of plasma aerodynamic effect through solving the electric potential equation and charge density equation.Moreover,we introduced momentum to Navier-Stokes equations in the form of source term.By numerically simulating the chamber air flow which was induced by plasma aerodynamic effect in the combustion-supporting actuator,we studied the effect of excitation voltage,gas flow and charge density on the plasma aerodynamic effect.The results show that,under the plasma aerodynamic effect,chamber flow turbulence increases,velocity distribution becomes non-uniform;as the excitation voltage increases,the concussion amplitude of chamber axial velocity increases;as the inlet velocity increases,plasma aerodynamic effect on chamber decreases continuously;as the charge density increases,the concussion amplitude of chamber axial velocity at the front and back of flame holder continuously aggravates.