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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。
In order to study the internal mechanism of the plasma aerodynamic effect, a numerical simulation model of the aerodynamic effect of the plasma in the combustor combustion-supporting actuator is established. By solving the potential equation and the charge density equation, the body force distribution function of the plasma aerodynamic effect is obtained. The Navier-Stokes equations are introduced into the model to simulate the air flow induced by the plasma aerodynamic effect in the combustion aids. The effects of excitation voltage, gas flow rate and charge density on the aerodynamic effects of the plasma in the combustion chamber are studied. The results show that turbulence and velocity distribution in the combustor flow field increase with the increase of excitation voltage under the action of plasma aerodynamic effect. The oscillation velocity of axial velocity increases with the increase of excitation voltage. The aerodynamic effect of plasma The influence on the flow field in the combustion chamber decreases with the increase of the inlet velocity. With the increase of the charge density, the oscillation of the axial velocity in the flow field around the flame stabilizer increases.