Numerical Study on the Heat Transfer Characteristics of Inclined Thread-Hole Jet

doi:10.7652/xjtuxb201909016

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Numerical Study on the Heat Transfer Characteristics of Inclined Thread-Hole Jet

更新时间：2025-07-09

- Numerical Study on the Heat Transfer Characteristics of Inclined Thread-Hole Jet
- Vol. 53, Issue 9, Pages: 120-128+182(2019)
- 作者机构：
  
  1. 西安交通大学机械制造系统工程国家重点实验室,西安,710049
  2. 广东西安交通大学研究院,广东,佛山,528000
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201909016
  CLC： TK124
- Online First：10 September 2019，
  
  Published：2019
- 稿件说明：
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Numerical Study on the Heat Transfer Characteristics of Inclined Thread-Hole Jet[J]. 2019, 53(9): 120-128+182.
DOI：

Numerical Study on the Heat Transfer Characteristics of Inclined Thread-Hole Jet[J]. 2019, 53(9): 120-128+182. DOI： 10.7652/xjtuxb201909016.

摘要

为了提高传统圆孔冲击射流的冷却效果

提出采用螺纹孔来代替圆孔

并采用数值模拟方法研究了倾斜状态下螺纹孔旋转冲击射流的复杂流动状态和传热性能

研究的影响因素包括射流倾斜角(α=45°～90°)、冲击距离(H/d=2

6)、雷诺数(Re=6 000～24 000)。研究结果表明:倾斜角和冲击距离对射流空间内旋涡的大小、形状和位置有较大的影响; 在倾斜状态下

旋转射流冲击冷却效果要优于圆孔射流

但当α=45°时

旋转射流冲击靶面的对流传热效果会明显恶化; 当Re=6 000

α=60°

H/d分别为2、4和6时

旋转射流靶面中心努塞尔数Nu比圆孔射流靶面中心Nu分别高139.9%、107.2%、27.3%; 当冲击距离相同时

旋转射流靶面平均努塞尔数高于圆孔射流。与圆孔射流相比

Re≤18 000下提高射流Re

旋转射流能显著增强靶面传热能力。

Abstract

To improve the cooling effect of traditional circular impinging jet

screw hole is used to replace the round hole.The complex flow and heat transfer performance of the swirling impinging jet with an inclined screw hole are studied by numerical simulation.The influencing factors include jet inclination angle(-=45- - 90-)

impingement distance(H/d=2

and Reynolds number(Re=6 000 - 24 000).The results show that the inclination angle and impact distance have great influences on the si-e

shape and position of vortices in the jet space.Under inclined screw-hole conditions

the impingement cooling effect of rotating jet is better than that of circular-hole jet

but when the inclination angle is equal to 45-

the convective heat transfer effect of the swirling jet impinging on target surface may deteriorate obviously.When Re=6 000

-=60- and the impingement distances H/d are 2

4 and 6

the Nusselt number at the center of swirling jet target surface is 139.9%

107.2% and 27.3% high

关键词

Keywords

references

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