论文部分内容阅读
本文针对中国3号航空煤油在超燃冲压发动机冷却通道内的超临界压力流动和传热现象,开展了流/固/热耦合的三维数值模拟研究.在准确考虑热物性变化的基础上,探讨了壁面热流密度及流体的入口速度对超临界压力传热过程的影响。结果表明,由于航空煤油在低流速下的传热效果较差,会造成冷却通道壁面温度在加热入口段快速升高;固体热传导现象在航空煤油超临界压力传热中变得非常重要,冷却通道侧壁面和下壁面固体温升现象突出;不同对流换热经验公式在航空煤油超临界压力传热中的适用性和应用范围也得到了初步的验证。
In view of the supercritical pressure flow and heat transfer in China’s No. 3 aviation kerosene in the scramjet cooling channel, a three-dimensional numerical simulation of flow / solid / thermal coupling is carried out.On the basis of accurately considering the change of thermal properties, The effects of wall heat flux and fluid inlet velocity on supercritical pressure heat transfer were investigated. The results show that due to the poor heat transfer effect of aviation kerosene at low flow rate, the wall temperature of the cooling passage will rapidly increase at the heating inlet section. The solid heat conduction phenomenon becomes very important in the supercritical pressure heat transfer of aviation kerosene. The phenomenon of temperature rise on the side wall and the lower wall is prominent. The applicability and application range of different convective heat transfer empirical formulas in the supercritical pressure heat transfer of aviation kerosene have also been preliminary verified.