基于等离子体合成射流的后台阶流动控制  

Flow control over backward-facing step by plasma synthesis jets

作　　者：王泽阳 王建明 王怡菲 WANG Zeyang;WANG Jianming;WANG Yifei

机构地区：[1]沈阳航空航天大学航空发动机学院,辽宁省航空推进系统先进测试技术重点实验室,辽宁沈阳110136

出　　处：《现代机械》2022年第6期6-10,共5页Modern Machinery

基　　金：国家自然科学基金(51476106)。

摘　　要：为实现对后台阶流动的控制,采用等离子体唯象模型,通过数值模拟的方法,将等离子体设置在台阶竖直壁面上的双开口方腔中构成合成射流,研究其对后台阶流动的控制。结果表明:无论是上部开口吸气、下部开口吹气还是上部开口吹气、下部开口吸气都能将主流再附点的位置提前。吸气效应能够将分离区流体吸入,减小分离区的强度,吹气效应能够为分离的主流注入动量,加快主流的再附,随着激励强度的增强,控制效果也得到增强。当将等离子体设置在方腔的上部,激励电压为5 kV,激励频率为6 kHz,并在上部开口吸气,下部开口吹气时,分离区尺度最小、控制效果最佳,相对基态工况可将再附点前移52.9%。In order to realize the control of the flow over backward-facing step,the plasma is set in a double-opening square cavity on the vertical wall of the step to form a synthetic jet by numerical simulation using a phenomenological model.The results show that either upper opening suction,lower opening blowing or upper opening blowing,lower opening suction can advance the position of the mainstream reattachment point.The suction effect can draw the fluid in the separation zone and reduce the intensity of the separation zone.The blowing effect can inject momentum into the separated mainstream and accelerate the reattachment of the mainstream,and the control effect is enhanced with the enhancement of the excitation intensity.When the plasma is set in the upper part of the square cavity,the excitation voltage is 5 kV,the excitation frequency is 6 kHz,and the upper opening suction and lower opening blowing,the separation zone scale is the smallest and the control effect is the best,and the reattachment point can be shifted forward by 52.9%relative to the baseline.

关 键 词：后台阶流动 流动控制 等离子体合成射流 再附点位置 数值模拟 

分 类 号：V211[航空宇航科学与技术—航空宇航推进理论与工程]