射流表面主流场速度与射流速度耦合减阻特性

谷云庆，赵刚，郑金兴，王飞，李照远，刘文博，赵华兴

(哈尔滨工程大学 机电工程学院，黑龙江 哈尔滨，150001)

摘 要：针对射流表面流场特性，运用可拓学基本原理，建立主流场速度与射流速度耦元、耦合方式的可拓模型。利用RNG k-ε湍流模型对射流表面主流场速度与射流速度耦合情况下减阻特性进行数值模拟，研究射流表面减小黏性阻力和压差阻力的原因及对射流孔附近壁面流域边界层控制行为。研究结果表明：主流场速度越小与射流速度越大耦合情况下射流表面减阻效果最好，节能效果明显；主流场速度与射流速度耦合对边界层的控制行为表现在, 射流表面模型使射流孔下游流域黏性底层厚度减小，边界层厚度降低，导致壁面所受黏性阻力减小；同时形成的反向漩涡在壁面形成的反向流对仿生射流表面产生逆流向的推动作用，对压差阻力产生抑制效应。

关键词：射流表面；摩擦阻力；耦合；数值模拟；减阻

Characteristics of drag reduction on coupling of jet surface main flow field velocity and jet velocity

GU Yun-qing, ZHAO Gang, ZHENG Jin-xing, WANG Fei, LI Zhao-yuan, LIU Wen-bo, ZHAO Hua-xing

(College of Mechanical and Electrical Engineering, Harbin Engineering University, Harbin 150001, China)

Abstract:Based on the characteristics of flow field of jet surface and the basic principles of extension, the extension module of coupling elements and coupling ways between the main flow field velocity and jet velocity was built. With RNG k-ε turbulence model simulating the drag reduction characteristics of the coupling between the main flow field velocity and the jet velocity, the reasons for reducing the viscous resistance and pressure resistance of the jet surface as well as the controlling behavior towards the flow field of the boundary layer of the wall near the jet holes were studied. The results show that the dray reduction effect of the jet surface is the best when the main flow field velocity gets smaller and the jet velocity gets greater, as well as the energy saving effect is also obvious. The behavior that the coupling of the main flow field velocity and jet velocity controlled the boundary layer is shown as reducing the thickness of viscous layer and the boundary layer, which leads to the reduction of the viscous resistance, and the effect that a counter-flow brought by the reversed eddy near the wall pushes the bionic jet surface flow towards upstream, which results in the pressure drag reduction.

Key words:jet surface; friction resistance; coupling; numerical simulation; drag reduction