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Active flow control by means of MHD plasma actuator in the curvilinear channel

机译：通过MHD等离子体执行器在曲线通道中进行主动流量控制

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The active flow separation control by means of magnetohydrodynamic (MHD) plasma actuator was organized in the curvilinear channel. The first type of MHD plasma actuator was the surface arc discharge in external magnetic field. Detailed description and preliminary testing of this type of actuator was described in [1]. The second type of MHD plasma actuator was based on modified spark jet actuator. Typical characteristics and jet properties was presented in [2]. The discharge mean power of first actuator was about 500W (5 kW/m). The velocity of flow induced flow by means of surface MHD actuator was more than 50m/s, providing the comparable disturbances of the flow velocity. The significant influence on the flow was obtained at flow velocities up to V=70 m/s for actuator operation at 150Hz repetition rate. The particle image velocimetry (PIV) visualization shows that the shift of separation point doesn't occur but, the circulation zone reduces meaningfully. The total pressure distribution was measured at the exit section of the channel. It was shown, that the average pressure loss coefficient distribution was changed at MHD actuator operation. Mean discharge power of MHD spark jet actuator was no more than 200 W. The schlieren photography shows that the maximum velocity of thermal point could be up to 200 m/s however typical velocities were 60-90 m/s. The influence on the flow was obtained at flow velocities up to V=40 m/s for actuator operation at 100Hz repetition rate.
机译：在曲线通道中组织了借助磁流体动力学（MHD）等离子体执行器进行的主动流分离控制。 MHD等离子致动器的第一种类型是外部磁场中的表面电弧放电。此类致动器的详细描述和初步测试在[1]中进行了描述。第二种MHD等离子致动器基于改进的火花喷射致动器。在[2]中介绍了典型的特性和射流特性。第一执行器的放电平均功率约为500W（5 kW / m）。借助表面MHD执行器产生的流的流速大于50m / s，从而提供了相当的流速扰动。在执行器以150Hz重复频率运行时，在高达V = 70 m / s的流速下获得了对流量的显着影响。粒子图像测速（PIV）可视化显示分离点未发生偏移，但循环区显着减小。在通道的出口部分测量总压力分布。结果表明，在MHD执行器运行时，平均压力损失系数分布发生了变化。 MHD火花喷射执行器的平均放电功率不超过200W。schlieren摄影显示，最大的热点速度可能高达200 m / s，但是典型速度为60-90 m / s。在执行器以100Hz重复频率运行时，在高达V = 40 m / s的流速下获得了对流量的影响。

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