摘 要：选用10组分模型替代碳氢燃料，对其在临界点附近的物理特性进行详细分析描述。根据超临界碳氢燃料热物性变化及其在管道内的对流换热特征，基于边界层理论，建立其在换热管中对流换热边界层分析模型和微分方程式，采用理论分析方法给出多项式和正弦速度分布式下常物性和变物性时的温度分布函数表达式。给出的计算公式为超燃冲压发动机的冷却计算提供指导。

Abstract: Using 10-component substituted model for hydrocarbon fuel,physical characteristics near the critical point are analyzed in details.According to the change of thermophysical properties and convective heat transfer characteristics of hydrocarbon fuel,based on the boundary layer theory,convective heat transfer boundary layer analysis model and differential equations are established for the supercritical hydrocarbon fuel in the heat exchange tubes.With theoretical analysis method,the temperature distribution functions are provided with constant and changeable physical property and under polynomial and sinusoidal different velocity distributions.The presented calculation formulas are expected to provide guidance for the cooling of scramjet engine.

TQ038

国家自然科学基金（51376163）；河南省教育厅科技攻关项目（14A480004）