超临界压力下航空煤油流动与传热特性试验

Experiment on convective heat transfer of aviation kerosene under supercritical pressures

关键词:  航空煤油  超临界态  对流传热

Key words:  Aviation kerosene  Supercritical state  Convective heat transfer

摘要:

本文针对超燃冲压发动机再生冷却系统运行条件,实验研究了大庆RP-3煤油在超临界压力下的流动和传热特性,目的在于研究煤油在各种工况下的流动参数变化以及对流传热规律。煤油通过二级煤油加热/输运系统加热,试验的煤油压力约2.6M～5.0MPa,油温约300～800K。相应的壁面热流密度为10～300kW/m2。通过油温与壁温的同步测量,结合非定常传热分析,获得了超临界压力下、亚/超临界温度范围内煤油的流动和传热物理参量的变化曲线。

Abstract:

In this paper,characteristics of the convective heat transfer of aviation kerosene were studied experimentally under supercritical pressure according to the conditions in a regenerative cooling system for the scramjet application. A two-stage kerosene heating system was used to heat the kerosene up to temperature of 300~800K at pressures of 2.6~5.0 MPa. The corresponding wall heat flux varied from 10 kW/m2 to 300kW/m2. By simultaneously measurements of the local fuel and wall temperatures,the heat transfer characteristics of aviation kerosene under supercritical pressures and both sub-critical and supercritical temperatures were determined using the method of unsteady heat-transfer analysis.