Investigation of film cooling from cylindrical hole with plasma actuator on flat plate

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• 作者：Yang Xiao ; Sheng-ji Dai ; Li-ming He ; Tao Jin ; Qian Zhang…
• 刊名：Heat and Mass Transfer
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：52
• 期：8
• 页码：1571-1583
• 全文大小：2,974 KB
• 刊物类别：Engineering
• 刊物主题：Engineering Thermodynamics and Transport Phenomena
  Industrial Chemistry and Chemical Engineering
  Thermodynamics
  Physics and Applied Physics in Engineering
  Theoretical and Applied Mechanics
  Engineering Fluid Dynamics
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1181
• 卷排序：52

文摘

This paper reports the Computational Fluid Dynamics modeling studies on the effect of plasma aerodynamic actuation on combustor film cooling performance. By comparing Case (i.e. film cooling hole with plasma actuator) result to Base (i.e. film cooling hole without plasma actuator) result, the mechanism of improving film cooling performance by using plasma actuator was analyzed. The results show that the Counter Rotating Vortex Pairs in Base are weakened by a new pair of vortex in Case, which is induced by the plasma-actuator-generated arc-shape-distributed electric body force. This leads to less interaction and less mixing between the main flow and the jet flow. Then it causes enhancement of the stability and the steadiness of the jet flow. Finally the average film cooling effectiveness in Case is higher than that in Base. For Case, the uniformity of temperature distribution along spanwise wall surface is improved as the actuator electrode radian increases, so does the average film cooling effectiveness. The film cooling effectiveness is higher when actuator is closer to the exit of hole.List of symbolsBRecombination coefficientc_pSpecific heat capacityDDiameter of circular holeDIFDiffusivity coefficientEElectric field strengtheElementary chargeFPlasma induced body force in 3DfBody force in 2DkHeat transfer coefficientlDistance between leading edge of actuator and holeM = (ρ_ju_j)/(ρ_∞u_∞)Blow rationDensity of plasmarThe inside radius of exposed electrodeRThe outside radius of encapsulate electrodeSPhoto ionization sourceTTemperatureuVelocity of fluid flowVAC voltagevVelocity of plasmax, y, zCoordinatesy+The normalized distanceαIonization coefficientρGas densityεPermittivityθThe radian of actuator’s electrodeη_acAttachment coefficientη = (T_∞ − T_aw)/(T_∞ − T_j)Adiabatic film cooling effectivenessφVoltage