射流孔排布对射流表面减阻性能的影响

Effect of Jet Hole Arrangement on Drag Reduction Characteristics of Jet Surface

摘要:

基于单孔射流特性，建立射流孔排布方式的计算模型，利用SST kω湍流模型对射流表面不同射流孔排布情况下的减阻特性进行数值模拟，分析射流表面射流孔排布对壁面黏性阻力和减阻率的影响，得到最大减阻率为33.65%，并对数值计算模型进行了实验验证。通过分析射流表面壁面边界层剪应力、壁面压应力、流场速度及射流孔下游区域产生的漩涡运动特性及分布规律，得知射流表面射流孔排布能够对壁面边界层进行有效的控制，并揭示了射流表面的减阻机理。

Abstract:

A calculation model of jet hole arrangement ways was established based on the characteristics of single jet hole. With SST kω turbulence model, the drag reduction characteristics of jet surface under the condition of different jet hole arrangement was researched by using the numerical simulation. Then, the impact of jet hole arrangement on surface viscous resistance and drag reduction rate was analyzed, and the maximum drag reduction rate reached 33.65%, which was experimentally validated by using numerical calculation model. The movement characteristics and distribution rules of the shear stress of wall boundary layer, the surface compressive stress, the flow velocity and vortex generating in the downstream of the jet hole were studied. The results showed that wall boundary layer could be well controlled by jet hole arrangement of jet surface, and the drag reduction mechanism of jet surface was also revealed.