超音速扩压器喷雾冷却数值仿真研究

为了探讨研究喷雾冷却中冷却水流量、喷射速度及喷嘴轴向分布位置等因素对超音速扩压器壁面温度的影响,借助CFD计算软件FLUENT,采用标准k-ε湍流模型,对喷雾冷却下超音速扩压器内流场进行了数值仿真。通过计算,得到了扩压器内压强分布及壁面温度分布。分析了喷雾冷却中冷却水流量、喷射速度及喷嘴轴向位置对超音速扩压器壁面温度的影响。研究表明：随着冷却水流量的增大,扩压器壁面温度降低。同时,扩压器入口处静压升高,对应仿真高度降低;减小冷却水喷射速度,可以有效降低扩压器入口处壁面温度;喷嘴的轴向分布位置对扩压器壁面温度有较大影响,仿真结果证明,喷嘴沿轴向呈对数分布有利于降低扩压器壁面温度。

An Emulational Study of Supersonic Diffuser Spray Cooling

In order to study the influences of water flux, spraying velocity and sprayer position on surface tempera-ture , based on standard k-edouble equation turbulent models, numerical simulation of the flow field of a supersonic diffuser cooled by spraying was done by using the CFD software Fluent. The distributions of pressure and surface tem-perature were attained. The influences of water flux, spraying velocity and sprayer position on surface temperature were analyzed. The results show that in company with cooling water aggrandizement, the surface temperature of the diffuse wall decreases. At the same time, the mass increase of cooling water causes reduction of the pressure at the entrance of the diffuser. As a result, the corresponding simulated altitude decreases. Reducing cooling water spraying velocity properly can reduce the diffuser entrance temperature effectively. The sprayer position influences the surface temperature greatly.