利用等离子控制凸包流动分离的数值模拟
Numerical simulation of plasma-based separation control over a hump
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摘要: 基于等离子发生器简化模型求解电势方程,得到电场及等离子分布,并将电场对等离子的作用力耦合到流动方程中.结果表明,电场力在电极交接处附近诱导气体运动并产生"壁面射流"效应,增加低能流体动量,显著改善附面层内速度分布;与无等离子控制措施相比,分离点位置最大延迟约4%特征尺寸,再附点位置最大提前约12%特征尺寸,分离范围明显减小.此外,电压较大、电极与流体接触式布置均能提高等离子控制流动分离的能力.Abstract: Using the simplified model of plasma generator,this paper solved electric equation to obtain the electric field and the plasma distribution,and then coupled the electrical force on the ions to flow equation.The results indicate that the electrical field could induce air flowing nearby the electrode interface and generate "wall surface jet flow" effect,increasing the fluid momentum and greatly improving the velocity in the boundary layer.Compared with the flow without plasma,the separation point was deferred about 4% chord,the attachment point was moved up approximately 12% chord,thus the separation scope was reduced obviously.In addition,increasing the voltage and exposing electrode to the surrounding air can enhance the plasma control ability.
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Key words:
- plasma /
- flow control /
- flow separation /
- wall surface jet flow
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