周向喷嘴数对旋流冷却流动传热特性的影响

吴凡; 杜长河; 王杰枫; 范小军; 李亮

doi:10.7652/xjtuxb201807014

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周向喷嘴数对旋流冷却流动传热特性的影响

更新时间：2025-07-09

- 周向喷嘴数对旋流冷却流动传热特性的影响
- Influence of the Number of Circumferential Nozzles on the Flow and Heat Transfer Characteristics of Swirl Cooling
- 西安交通大学学报 2018年52卷第7期页码：94-100
- 作者机构：
  
  西安交通大学叶轮机械研究所,西安,710049
- 作者简介：
  
  李亮(通信作者),男,教授,博士生导师。基金项目: 国家科技重大专项资助项目(2017-I-0009-0010)
- 基金信息：
- DOI：10.7652/xjtuxb201807014
  中图分类号： TK474.7
- 网络首发：2018-07-10，
  
  纸质出版：2018
- 稿件说明：
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吴凡, 杜长河, 王杰枫, 等. 周向喷嘴数对旋流冷却流动传热特性的影响[J]. 西安交通大学学报, 2018,52(7):94-100.

Influence of the Number of Circumferential Nozzles on the Flow and Heat Transfer Characteristics of Swirl Cooling[J]. 2018, 52(7): 94-100.
吴凡, 杜长河, 王杰枫, 等. 周向喷嘴数对旋流冷却流动传热特性的影响[J]. 西安交通大学学报, 2018,52(7):94-100. DOI： 10.7652/xjtuxb201807014.

Influence of the Number of Circumferential Nozzles on the Flow and Heat Transfer Characteristics of Swirl Cooling[J]. 2018, 52(7): 94-100. DOI： 10.7652/xjtuxb201807014.

摘要

为了研究在旋流腔周向布置多个喷嘴对旋流冷却特性的影响

分别建立了保持喷嘴几何尺寸不变和保持喷嘴进口总面积不变的旋流冷却模型。在相同质量流量和喷嘴长宽比的条件下

采用数值计算方法

研究了周向喷嘴数对旋流冷却特性的影响

并分析、对比了两种情况下旋流冷却性能的差异。研究结果表明:当保持喷嘴几何尺寸不变时

靶面平均Nu随周向喷嘴数增加而逐渐减小

但靶面Nu分布更加均匀

由于下游冷气速度受轴向横流影响较大

高Nu区向下方偏移

旋流腔冷气涡数目随周向喷嘴数增多而逐渐减少

冷气总压损失也随之减少; 当保持喷嘴进口总面积不变时

随着周向喷嘴数的增加

靶面高Nu区面积和靶面平均Nu先增大然后略有减小

都在周向喷嘴数为2时达到最大值。由于下游冷气速度受轴向冲击影响较小

在旋流腔轴向下游处

靶面展向平均Nu略有提高

而总压损失随着周向喷嘴数的增加逐渐增加。

Abstract

To study the effects of the number of circumferential nozzles in vortex chamber on the swirl cooling characteristics

two swirl cooling models were established

keeping the nozzle geometry and the total area of the nozzle inlets unchanged

respectively. At the same mass flow rate and nozzle aspect ratio

the effects of the number of circumferential nozzles on the swirling cooling characteristics were studied by numerical method

and the difference of swirling cooling performance between the two models were compared and analyzed. Results revealed that when the nozzle geometry is unchanged

the target average Nusselt number decreases with the number of nozzles

but the target Nusselt number distribution becomes more uniform. As the downstream air speed is more affected by the axial flow

the high Nusselt number region deflects downward. The number of air vortexes in vortex chamber decreases due to the increase in the number of nozzles

and the total pressure loss also decreases. When the total area of the nozzle inlets is unchanged

as the number of nozzles increases

the area of target high Nusselt number region and the average Nusselt number at first increase and then decrease

and become the largest when the number of nozzles is two. Because the downstream air velocity is less affected by the impact of axial flow

the target spanwise average Nusselt number has a small increase in the axial downstream

while the total pressure loss increases with the number of circumferential nozzles.

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Keywords

references

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