发动机冷却燃料做功潜力?分析

在高马赫数飞行下,用燃料冷却超燃冲压发动机壁面的冷却需求量大于发动机燃烧量。为了降低燃料的冷却量以及实现燃料冷却量和燃烧量的匹配,采用?分析法对超燃冲压发动机壁面燃料冷却工质进行做功潜力分析。发动机壁面冷却燃料的特性决定其热量?大小。根据发动机壁面温度分布、热流密度分布计算热量?,建立稳定流动燃料工质的?平衡方程。结果表明：在壁面最高温度为1200K时,传入壁面的热量为562.4kW,其中理论热量?为541.3kW；冷却燃料工质流量的增加,最大输出功减小；燃料工质出口温度增加,输出功减小,燃料工质出口压力增加,输出功基本不变。

Exergy Analysis of the Potential Working about the Heat of Cooling Fuel for Scramjet

Coolant flow rate of fuel for scramjet exceeds stoichiometric flow rate in the high flight Mach number. In order to decrease the coolant flow rate of fuel and implement the matching between coolant flow rate and stoichiometric flow rate, the potential working for the cooling fuel has been analyzed by exergy method. It is determining the quantity of exergy that the properties of the cooling of fuel. The exergy has been calculated according to the distribution of scramjet wall`s temperature, scramjet wall`s heat flux, and the exergy equilibrium equation has been given. It has been conclusion that the heat of scramjet wall is 562.4kW and the exergy is 541.3kW when the maximum temperature of scramjet wall is 1200K. It is also concluded that the potential working is decreased when the coolant flow rate of fuel is increasing and the output temperature of fuel is increasing, and the potential working is no changed when the output pressure of fuel is increasing.