射流冲击对内冷通道侧壁面换热特性影响研究

发布时间：2018-04-13 10:32

本文选题：前缘 + 内冷通道　；参考：《推进技术》2016年07期

【摘要】：建立了前缘梯形内冷通道的放大模型,结合斜射流冲击冷却进行试验测量,研究通道内壁面的换热特性,并结合流场测量结果进行换热分析,更好地理解此类受限通道内冲击冷却的强化换热机理,为更高效的内冷通道设计提供参考。使用热电偶对出流侧壁面温度进行了详细测量,研究射流角度、横流和射流雷诺数对其Nu的影响规律。结果表明:出流孔的抽吸作用会强化孔排上方和下方边缘附近壁面的换热;射流入射角度的增加使出流孔上方壁面的Nu峰值对横流强度变化的敏感度提高;横流会削弱侧壁面上Nu峰值,且对出流侧壁面的不同区域换热情况的影响位置不同;射流雷诺数的增加将大幅提高整个出流侧壁面的换热能力,但对其换热特性规律不会产生影响。
[Abstract]:The amplification model of the trapezoidal inner cooling channel is established, and the heat transfer characteristics of the inner wall of the channel are studied by means of the experimental measurement combined with the impact cooling of oblique flow, and the heat transfer analysis is carried out according to the results of the flow field measurement.A better understanding of the enhanced heat transfer mechanism of this kind of impingement cooling in confined channels provides a reference for the design of more efficient internal cooling channels.The influence of jet angle, cross flow and jet Reynolds number on Nu was studied by using thermocouple to measure the temperature of side wall of outlet flow in detail.The results show that the suction of the outlet hole will enhance the heat transfer between the wall above the hole row and the bottom edge, and the increase of jet incidence angle will increase the sensitivity of the peak value of Nu in the wall above the outlet hole to the change of transverse flow intensity.The cross flow will weaken the peak value of Nu on the side wall and influence the heat transfer in different regions of the side surface of the outlet flow, and the increase of Reynolds number of jet will greatly improve the heat transfer capacity of the whole side surface of the outlet flow.However, it has no effect on the heat transfer characteristics.
【作者单位】：第二炮兵工程大学动力工程系;西北工业大学动力与能源学院;
【基金】：国家自然科学基金(51206180) 陕西省自然科学基金(2014JQ7276)
【分类号】：TK124

【相似文献】