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6篇 您的检索式:作者名="SHIN Jichul"
    题名 作者 年代 出处 被引量
1Characteristics of High Speed Electro-thermal Jet Activated by Pulsed DC Discharge显示文摘Experimental study of synthetic jet produced by pulsed direct current(DC) discharge is presented.High velocity jet is activated electro-thermally by high frequency pulsed DC discharge in small cavity.A cavity of 2.38 mm diameter cylinder bounded by circular electrode is made in a ceramic plate and a small orifice of 1.78 mm diameter is drilled in the middle of cavity.High frequency pulsed DC discharge instantaneously heats air in the cavity and produces high velocity jet at the exit of the orifice.Schlieren imaging at high framing rate of 100 kHz reveals the presence of supersonic precursor shock followed by the jet emerging from the orifice.The jet velocity reaches as high as about 300 m/s.Jet with smaller cavity volume produces lesser effect and jet velocity reaches maximum at certain cavity volume with given discharge current and orifice size.As duty time of pulse increases from 5 to 20 μs at fixed frequency of 5 kHz,the jet velocity also increases and becomes nearly constant with further increase in duty time.At fixed duty time of 20 μs,higher frequency pulsing of 10 kHz produces degradation of the jet as the discharge pulse continues.The jet developed in this study is demonstrated to be strong enough to penetrate deep into supersonic boundary layer and to produce a bow shock when the jet is issued into Mach 3 supersonic flow.Jichul Shin 2010Chinese Journal of Aeronautics2010,23,5:15
2Numerical investigation of aerodynamic flow actuation produced by surface plasma actuator on 2D oscillating airfoil显示文摘Numerical simulation of unsteady flow control over an oscillating NACA0012 airfoil is investigated. Flow actuation of a turbulent flow over the airfoil is provided by low current DC surface glow discharge plasma actuator which is analytically modeled as an ion pressure force produced in the cathode sheath region. The modeled plasma actuator has an induced pressure force of about 2 k Pa under a typical experiment condition and is placed on the airfoil surface at 0% chord length and/or at 10% chord length. The plasma actuator at deep-stall angles(from 5° to 25°) is able to slightly delay a dynamic stall and to weaken a pressure fluctuation in down-stroke motion. As a result, the wake region is reduced. The actuation effect varies with different plasma pulse frequencies, actuator locations and reduced frequencies. A lift coefficient can increase up to 70% by a selective operation of the plasma actuator with various plasma frequencies and locations as the angle of attack changes. Active flow control which is a key advantageous feature of the plasma actuator reveals that a dynamic stall phenomenon can be controlled by the surface plasma actuator with less power consumption if a careful control scheme of the plasma actuator is employed with the optimized plasma pulse frequency and actuator location corresponding to a dynamic change in reduced frequency.Minh Khang Phan Jichul Shin 2016Chinese Journal of Aeronautics2016,29,4:5
3Dynamics of pulse phenomena in helium dielectric-barrier atmospheric-pressure glow dis charges显示文摘Jichul Shin Laxminarayan L Raja 2003Journal of Applied Physics2003,94,12:1
4Run-to-run variations, asymmetric pulses, and long time scale transient phenomena in dielectric-barrier atmospheric pressure glow discharges 显示文摘Jichul Shin Laxminarayan L Raja 2007Journal of Physics D: Applied Physics2007,40,10:1
5Dynamic Characteristics of a Microhollow Cathode Sustained Discharge with Split Third Electrodes for Potential Flow Application to Flow Velocimetry显示文摘microhollow 阴极的动态行为与裂口第三电极支撑了分泌物试验性地被调查。持续分泌物面对不与一个传统的单身者一起清楚地是可检测的氩气体流动的小数量各向同性地胀大第三个电极。以高流动率,持续分泌物与弧形状转移到移动迅速的压缩分泌物。修改分泌物结构在第三个电极上在当前的分发引起移动,并且当前的山峰地点在某个流动范围上与流动率线性地变化。如此的线性行为可以被用于在 situ 流动速度测量。Sharmin Sultana Jichul Shin 2014Chinese Physics Letters2014,31,9:1
6One-dimensional simu- lation of multi pulse phenomena in dielectric barrier atmospheric pressure glow discharges 显示文摘YUAN Xiaohui SHIN Jichul RAJA L L 2006Vacuum2006,80,11:1
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