吸热型碳氢燃料热沉的测定研究

STUDY ON HEAT SINK OF ENDOTHERMIC FUELS

改进并重新组装了自行研制的高温热导型流动热量计 ,利用电标定法测定了该仪器在 70 0℃和 80 0℃的热量常数。为检验仪器的可靠性 ,本仪器测定了氮气的热沉 ,结果表明实验值与用氮气的热容公式计算所得的计算值基本吻合。对自制的吸热型碳氢燃料 (FRA)和作为模型化合物的正庚烷的热沉进行了测定 ,发现在 70 0℃时两者的热沉值比较接近 ,分别为 3 0 7MJ kg和 3 2 3MJ kg。在 80 0℃时 ,两者都具有较高的热沉值 ,分别达到 5 6 9MJ kg和 6 6 0MJ kg ,该热沉值能够满足超高音速飞行器的热管理要求。

A set of high-temperature heat conduction type calorimetric system for measuring of heat sink of endothermic fuels has been developed. The thermal constant for the apparatus has been determined through an electric-heating method. By using this set-up, the heat sink of nitrogen has been measured. The experimental values are in good agreement with those calculated from formula of thermal capacity. In addition, the heat sinks of fuel FRA and model compound heptane have been measured. The values at 700℃ are 3.07MJ/kg and 3.23MJ/kg respectively while the values at 800℃ are 5.69MJ/kg and 6.60MJ/kg. With such a large heat sink value, FRA can meet the requirement of hypersonic flying machine.