摘要
通过将火花放电的物理效应等效为气体焦耳加热的过程,在能量方程中引入能量源项,进行了单次能量沉积下两电极等离子体合成射流的唯象模拟。提出将等离子体合成射流对外界流场的动能和热能注入分别作为表征射流"冲击效应"和"热效应"的参数。研究表明在单次放电条件下射流建立的自维持振荡过程中,射流动能和热能主要集中于主射流阶段且射流的"冲击效应"相比"热效应"衰减更快,在一个大气压下两电极激励器总的能量转化效率约为2.3%。分析了出口构型对射流的影响,研究表明收缩孔结构可以有效提高射流速度,但将导致射流动量和饱和频率的降低。
Plasma synthetic jet（some called＂spark jet＂or＂pulsed-plasma jet＂）is a new type of plasma aerodynamic actuation.It is a synthetic jet that is generated by striking an electrical discharge in a small cavity and the gas in the cavity spurts out through a small orifice in a high speed after pressurization owing to the heating caused by electrical discharge.To study the performance characteristics of two-electrode plasma synthetic jet and the influence of different actuator orifice shapes,aphenomenological simulation of two-electrode plasma synthetic jet built by a single energy deposition was accomplished by equating the physical effects of the spark discharge with gas Joule heating and adding source term in energy equation.The kinetic energy and heat injection into outer flow field of plasma synthetic jet were used as characterizations of ＂impact effect＂and＂thermal effect＂.The results show that the kinetic energy and heat injection of plasma synthetic jet are mostly concentrating in primary jet during the self-sustained oscillation process established by a single discharge,and ＂thermal effect＂of jet works longer than ＂impact effect＂.Overall energy efficiency of two-electrode plasma synthetic jet actuator is about 2.3% at1 atm.The influence of different actuator orifice shapes was studied and it shows that shrinking orifice can effectively improve the jet velocity,but will reduce jet momentum and saturation frequency simultaniously.
出处
《空气动力学学报》
CSCD
北大核心
2015年第6期799-805,共7页
Acta Aerodynamica Sinica
基金
国家自然科学基金(11372349)
全国优秀博士论文作者专项资金(201058)
国防科技大学杰出青年基金(CJ110101)
关键词
等离子体合成射流
唯象模拟
能量效率
出口构型
性能
plasma synthetic jet
phenomenological simulation
energy efficiency
orifice shape
performance characteristics
