Drag reduction characteristics of longitudinal grooves under the condition of limited gap height

JU Kang; ZHAO Zhuobin; DENG Qinghua; LI Jun

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Drag reduction characteristics of longitudinal grooves under the condition of limited gap height

更新时间：2026-03-19

- Drag reduction characteristics of longitudinal grooves under the condition of limited gap height
- JOURNAL OF XI’AN JIAOTONG UNIVERSITY (2026)
- 作者机构：
  
  西安交通大学能源与动力工程学院，710049，西安
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK14
- Received：27 January 2026，
  
  Revised：2026-03-10，
  
  Accepted：19 March 2026，
- 稿件说明：
移动端阅览
JU Kang, ZHAO Zhuobin, DENG Qinghua, et al. Drag reduction characteristics of longitudinal grooves under the condition of limited gap height[J/OL]. JOURNAL OF XI’AN JIAOTONG UNIVERSITY, 2026.
DOI：

JU Kang, ZHAO Zhuobin, DENG Qinghua, et al. Drag reduction characteristics of longitudinal grooves under the condition of limited gap height[J/OL]. JOURNAL OF XI’AN JIAOTONG UNIVERSITY, 2026. DOI：

摘要

纵向沟槽能够显著降低湍流流动的壁面摩擦阻力，在诸多工程领域具有重要应用价值。针对当前其在间隙高度受限场景下减阻特性不明晰的现状，本文通过数值方法研究了6种纵向微沟槽在不同间隙高度下的减阻情况，从速度梯度、摩擦切应力、平均速度分布、湍流动能和流向涡量5个方面深入探讨了其减阻机制，比较了各种槽形的减阻性能，分析了沟槽的无量纲横截面积和无量纲湿润周长对减阻性能的影响规律。结果表明，纵向沟槽能够有效减缓速度梯度、降低摩擦切应力、降低湍动能峰值，抑制流向涡，使得矩形沟槽和半圆形沟槽的减阻效果最好，梯形沟槽次之；在无量纲槽宽、无量纲横截面积和无量纲湿周分别为18、13和40左右时，各种纵向沟槽的减阻效果达到最佳，且法向湿润周长增加可使得槽谷两端摩擦切应力大幅度下降，增大减阻区域，提升减阻效果；随着间隙高度增加，减阻效果增加，且逐渐趋于稳定，矩形沟槽在间隙高度为80倍沟槽宽度时，可减阻4.2%。本文研究结果为纵向沟槽截面形状和尺寸优化提供了技术支撑，同时更为间隙高度受限条件下的湍流减阻提供了重要参考。

Abstract

Longitudinal grooves can significantly reduce wall frictional resistance in turbulent flow

holding substantial application value across various engineering fields. In light of the unclear drag reduction characteristics in scenarios with restricted gap heights

this study investigates the drag reduction performance of six types of longitudinal micro-grooves at different gap heights using numerical methods. The research delves into the drag reduction mechanisms from five perspectives: velocity gradient

frictional shear stress

mean velocity distribution

turbulent kinetic energy

and streamwise vorticity. The drag reduction performances of various groove geometries are compared

and the effects of the dimensionless cross-sectional area and dimensionless wetted perimeter on drag reduction performance are analyzed. The results indicate that longitudinal grooves effectively mitigate the velocity gradient

reduce frictional shear stress

lower the peak turbulent kinetic energy

and suppress streamwise vortices

with rectangular and semicircular grooves demonstrating the most effective drag reduction

followed by trapezoidal grooves. Optimal drag reduction is achieved when the dimensionless groove width

dimensionless cross-sectional area

and dimensionless wetted perimeter are approximately 18

and 40

respectively. Furthermore

an increase in normal wetted perimeter significantly reduces the frictional shear stress at both ends of the groove valley

enlarging the drag reduction area and enhancing the drag reduction effect. As the gap height increases

the drag reduction effect improves

eventually stabilizing. At a gap height of 80 times the groove width

rectangular grooves can achieve a drag reduction of 4.2%. The findings of this study provide technical support for the optimization of the cross-sectional shape and size of longitudinal grooves

and serve as an important reference for turbulent drag reduction under conditions of restricted gap height.

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references

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