矩形冷却通道内超临界RP-3航空煤油对流传热数值研究

Numerical study of convective heat transfer characteristics of supercritical RP-3 aviation kerosene in rectangular cooling channel

中文关键词: 超临界压力  航空煤油  矩形冷却通道  对流换热  数值研究

英文关键词: supercritical pressure  aviation kerosene  rectangular cooling channel  convective heat transfer  numerical study

中文摘要:

      对超临界压力下RP-3航空煤油在内截面宽为4 mm、高为4 mm、固体壁面厚为1mm、加热段长度为500 mm的水平矩形冷却通道内的对流传热特性进行了数值模拟研究。分析了通道内速度场的分布规律；讨论了热流密度、压力、进口温度对传热的影响。计算结果表明：当主流温度处于拟临界温度附近时,流体物性参数变化剧烈,导致传热系数降低,传热出现恶化。在超临界压力下,较低的热流密度、增大压力、降低进口流体温度或提高质量流速均有利于改善冷却通道内的传热性能。

英文摘要:

      Numerical simulations of convective heat transfer characteristics of supercritical RP-3 aviation kerosene in a rectangular cooling channel with a dimension of 4mm in width, 4mm in height and 500mm in length were carried out. The distribution of inside velocity was analyzed and the effects of heat flux, pressure and inlet temperature on heat transfer were also investigated. The predictions indicate that the thermophysical properties of the fluid violently changes, reducing the heat transfer coefficient and resulting in deterioration of heat transfer around the pseudo-critical temperature. The heat exchange performance can be improved under the supercritical pressure by decreasing thermal flow density and inlet fluid temperature, increasing pressure and mass flow rate.