Dynamics and control of the vortex flow behind a slender conical forebody by a pair of plasma actuators
Dynamics and control of the vortex flow behind a slender conical forebody by a pair of plasma actuators
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一对等离子体执行器对细长圆锥形前体后面涡流的动力学和控制
DOI：
10.1063/1.5005514
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发表时间：
2018-02-01
影响因子：
4.6
通讯作者：
Luo, Shijun
中科院分区：
文献类型：
--
作者：
Meng, Xuanshi;Long, Yuexiao;Luo, Shijun
本文利用粒子图像测速技术（PIV）和表面压力测量技术对细长锥形前体大攻角绕流进行了研究。计算结果证实了分离涡存在两个随机出现的镜像非对称双稳态，从而产生较大的侧向力和力矩。一对精心设计的介质阻挡放电等离子体致动器安装在圆锥体的顶点附近和两侧，用于操纵涡流，从而提供对身体上的侧力的控制，而不使用襟翼。通过利用占空比驱动方案，交替驱动的端口和右舷等离子体致动器和优化的占空比频率，目前的工作表明，实现一个近乎完美的线性比例控制的侧力和力矩响应占空比比的可行性。采用锁相PIV技术和表面压力测量技术研究了非定常流场的动态演化。
Detailed particle-image-velocimetry (PIV) and surface pressure measurements are presented to study the vortex flow behind a slender conical forebody at high angles of attack. The results confirm the existence of two randomly appearing mirror imaged asymmetric bi-stable states of the separation vortices, giving rise to large side force and moment. A pair of carefully designed dielectric barrier discharge plasma actuators mounted near the apex and on both sides of the conical body are used to manipulate the vortex flow and thus provide control of the side forces on the body without using flaps. By making use of a duty-cycle actuation scheme that alternately actuates the port and starboard plasma actuators and optimizing the duty-cycle frequency, the present work demonstrates the feasibility of achieving a nearly perfect linear proportional control of the side force and moment in response to the duty-cycle ratio. Phase-locked PIV and surface pressure measurements are used to study the unsteady dynamic evolut...