Influences of Jet Angle and Jet Nozzle Number on Flow and Heat Transfer Characteristics of Swirl Cooling

doi:10.7652/xjtuxb201604012

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Influences of Jet Angle and Jet Nozzle Number on Flow and Heat Transfer Characteristics of Swirl Cooling

更新时间：2025-07-09

- Influences of Jet Angle and Jet Nozzle Number on Flow and Heat Transfer Characteristics of Swirl Cooling
- Vol. 50, Issue 4, Pages: 76-80+146(2016)
- 作者机构：
  
  西安交通大学叶轮机械研究所,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201604012
  CLC： TK474.7
- Online First：10 April 2016，
  
  Published：2016
- 稿件说明：
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Influences of Jet Angle and Jet Nozzle Number on Flow and Heat Transfer Characteristics of Swirl Cooling[J]. 2016, 50(4): 76-80+146.
DOI：

Influences of Jet Angle and Jet Nozzle Number on Flow and Heat Transfer Characteristics of Swirl Cooling[J]. 2016, 50(4): 76-80+146. DOI： 10.7652/xjtuxb201604012.

摘要

针对喷射角度和喷嘴数影响旋流冷却流动和传热特性的问题

采用数值方法进行了研究。研究时冷气通过不同的喷嘴进口进入旋流腔并经旋流腔出口流出

当变化喷嘴数时

保持喷嘴进口在轴向上均匀分布。研究结果表明:冷气从喷嘴射入旋流腔

冲刷壁面并与轴向主流强烈混合

形成了高传热区域; 换热强度在轴向和周向沿下游逐渐减弱

高传热区域在下游向出口偏移。喷射角度远离90°时

冷气旋流运动减弱

传热强度减小; 随着喷嘴数的增多

冷气喷射速度减小

高传热区换热强度减小

冷气周向速度和靶面传热强度分布更为均匀; 平均努塞尔数随着喷射角度和喷嘴数的增大而先增大后减小

在喷射角为90°、喷嘴数为9时平均努塞尔数最大; 总压损失系数随着喷射角度和喷嘴数的增大而增大。与简单圆管旋流冷却模型相比

喷射角为90°、喷嘴数为9的旋流腔结构的换热特性更加优良。

Abstract

A numerical method is utilized to investigate effects of jet angle and number of jet nozzles on the aerodynamic and heat transfer behaviors of swirl cooling. Cooling air is injected into the swirl chamber through various jet nozzles

and then flows out from the swirl chamber outlet. The distribution of jet nozzles along the axial direction is kept uniform when the number of jet nozzles is changed. Results show that when the cooling air jets into the swirl chamber from jet nozzles

it scours the wall and mixes with the axial mainstream

then a significant high heat transfer region is generated. The heat transfer intensity gradually decays along the axial and the circumferential directions

and the high heat transfer region shows deflection towards outlet at the downstream. When the jet angle turns away from 90°

the cooling air rotation movement is weakened

leading to a decrease of heat transfer intensity. When the number of jet nozzles increases

the air jet velocity reduces

and the thermal intensity in the high heat transfer region decreases. Moreover

the circumferential air velocity and the distribution of heat transfer intensity in target wall become more uniform. The global average Nusselt number increases at first and then reduces as the jet angle and the number of jet nozzles increase

and reaches the highest value when the jet angle arrives 90° and the number of jet nozzles is 9. The total pressure loss ratio increases as the jet angle and the number of jet nozzles increase. A comparison with the traditional simple pipe swirl cooling model shows that the present blade leading edge swirl chamber structure with 90° jet angle and 9 jet nozzles has more remarkable heat transfer property.

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references

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DU Changhe, FAN Xiaojun, LI Liang, et al. Effects of jet nozzle aspect ratio and Reynolds number on flow and heat transfer characteristics of vortex cooling [J]. Journal of Xi'an Jiaotong University, 2015, 49(12): 124-129.

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