冠齿喷管射流冲击半圆形靶面的对流换热

吕元伟; 张靖周; 单勇; 孙文静

doi:10.7527/S1000-6893.2020.24762

航空学报 >

2021 , Vol. 42 >Issue 7: 124762 - 124762

DOI: https://doi.org/10.7527/S1000-6893.2020.24762

流体力学与飞行力学

冠齿喷管射流冲击半圆形靶面的对流换热

吕元伟 ,
张靖周 ,
单勇 ,
孙文静

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南京航空航天大学能源与动力学院江苏省航空动力系统重点实验室, 南京 210016

收稿日期: 2020-09-17

修回日期: 2020-10-14

网络出版日期: 2020-12-31

基金资助

国家自然科学基金（51776097）

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Convective heat transfer of chevron-nozzle jet impingement on semi-circular surfaces

LYU Yuanwei ,
ZHANG Jingzhou ,
SHAN Yong ,
SUN Wenjing

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Jiangsu Province Key Laboratory of Aerospace Power System, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

Received date: 2020-09-17

Revised date: 2020-10-14

Online published: 2020-12-31

Supported by

National Natural Science Foundation of China (51776097)

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摘要

针对具有相同相对曲率（d/D=0.1）的凹形和凸形半圆柱靶面，在典型的雷诺数（Re=5 000~12 000）和无因次冲击距离（H/d=1~8）下进行了射流冲击对流换热的实验研究，同时在特定的射流雷诺数下进行了射流冲击大涡模拟分析，以揭示冠齿喷管在不同形状靶面上的强化传热作用机制。研究结果表明：射流喷管和靶面形状对于射流驻点附近的流场和对流换热具有显著的影响，冠齿喷管出口诱导的流向涡改变了圆形射流发展中的轴对称环形涡内在特征，无论是凹形还是凸形靶面，冠齿喷管相对于圆形喷管都体现出一定的强化射流传热效果；与凸形靶面相比，射流冲击凹形靶面受到凹腔内部的回流影响，导致冠齿喷管射流冲击对流换热的降低。

关键词： 射流冲击; 冠齿喷管; 凹形靶面; 凸形靶面; 对流换热

本文引用格式

吕元伟 , 张靖周 , 单勇 , 孙文静 . 冠齿喷管射流冲击半圆形靶面的对流换热[J]. 航空学报, 2021 , 42(7) : 124762 -124762 . DOI: 10.7527/S1000-6893.2020.24762

Abstract

An experimental research is performed to illustrate the different mechanisms of the chevron nozzle in improving jet impingement heat transfer over concave and convex semi-circular target surfaces with the same relative curvature (d/D) of 0.1. The experimental tests are carried out with jet Reynolds numbers (Re) ranging from 5 000 to 12 000 and dimensionless nozzle-to-surface distances (H/d) ranging from 1 to 8. Simultaneously, computations based on the large eddy simulation approach are conducted with a specific jet Reynolds number to characterize the flow dynamics of the chevron jet impingement on the different target surfaces. Results show that both the nozzle shape and the target surface shape significantly affect the jet flow dynamics and heat transfer in the vicinity of jet stagnation. For the chevron nozzle, the streamwise vortices developed from the chevron notches change the vortical coherence of the axisymmetric toroidal vortices in the round jet development. Despite of the target surface shape, the chevron nozzle is confirmed to be capable of enhancing the jet impingement heat transfer related to the round nozzle. Compared to that on the convex surface, the jet impingement on the concave surface is affected by the recirculation flow inside the concave cavity, leading to a degradation of chevron-nozzle jet impingement heat transfer, particularly at large nozzle-to-surface distances.

Key words： jet impingement; chevron nozzles; concave target surface; convex target surface; convective heat transfer

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