Drag reduction characteristics on jetting surface with jet angle-jet velocity coupling

作者：Gu, Yunqing; Zhao, Gang; Zheng, Jinxing; Zhang, Shu; Ru, Jing; Liu, Mingming; Yao, Jianjun

来源：Journal of Xi'an Jiaotong University, 2012, 46(9): 71-77.

• Coupling element
• Jet surfaces
• K-Omega turbulence model
• Maximum drag reductions
• Pressure resistance
• Reduction effects
• Velocity gradients
• Viscous resistance

An extension model for coupling elements and coupling ways of the jet angle and jet velocity was built to reduce the resistance of unsmoothed bionics surfaces from the basic extension theory. With the SST k-ω turbulence model, the simulation on the drag reduction characteristics with the jet angle-jet velocity coupling was performed, and then the reasons for reducing the viscous resistance and pressure resistance of the jetting surface and the controlling behavior of jetting surface towards the boundary layer were explored. The results show that the drag reduction effect of the jetting surface is better when the jet angle and the jet velocity are coupled. The maximum drag reduction rate reaches 28.10% when the jet angle is 30° coupled with the jet velocity of 1.2 m/s. With the jet angle-jet velocity coupling, the jetting surface can reduce the velocity gradient at the wall and increase the viscous sublayer thickness, thus reducing the pressure resistance and viscous resistance at the wall and then leading to the drag reduction. In addition, the pressure resistance with the coupling, as an additional power to a certain extent, has a propelling effect on the fluid of the jetting surface.

• 出版日期2012
• 单位哈尔滨工程大学