吸热型碳氢燃料的定压比热测量研究  

Study of the Measurement of the Specific Heat Capacity of a Heat Absorption Type Hydrocarbon Fuel at a Constant Pressure

作　　者：黄淑君[1] 郭亚军[2] 杨竹强[3] 刘朝晖[3] 

机构地区：[1]西安建筑科技大学 [2]西安建筑科技大学环境与市政工程学院,陕西西安710055 [3]西安交通大学动力工程多相流国家重点实验室,陕西西安710049

出　　处：《热能动力工程》2015年第6期833-836,965,共4页Journal of Engineering for Thermal Energy and Power

基　　金：青年科学基金(21306147)

摘　　要：针对亚临界及超临界压力下吸热型碳氢燃料的定压比热进行了在线测量研究。基于能量守恒原理,设计了一套定压比热测量装置,并对测试装置的几何尺寸和结构进行了优化。在用去离子水和环己烷对测试装置进行标定的基础上,对吸热型碳氢燃料压力在2.0-5.0 MPa、温度在333-903 K范围内的定压比热进行了测量,获得了不同压力下比热随温度变化的曲线。试验结果表明:定压比热在低温区随温度平稳增加,在拟临界、临界温度时达到第一个峰值;在高温区吸热型化学反应发生后比热值随温度的增加不断增大。而定压比热在临界、拟临界温度区的峰值随压力的增加逐渐减小,但在高温化学反应区比热随压力的增加而增大。At subcritical and supercritical pressures,an on-line measurement was performed of the specific heat capacity at a constant pressure of a heat absorption type hydrocarbon fuel. Based on the energy conservation theory,a set of device for measuring the specific heat capacity at a constant pressure was designed and the geometrical dimensions and structures of the device under discussion were optimized. On the basis of the device in question being calibrated by using deioned water and cyclohexane,when the pressure ranges from 2. 0 to 5. 0 MPa and the temperature from 333 K to 903 K,the specific heat capacities of the heat absorption type hydrocarbon fuel were measured and the curves showing changes of the specific heat capacity with temperature were obtained. The test results show that in the low temperature zone,the specific heat capacity at a constant pressure will smoothly and stably increase with an increase of the temperature and reach the peak values at the pseudocritical and critical temperature respectively. After a heat absorption type chemical reaction has taken place in the high temperature zone,the specific heat value will ceaselessly increase with an increase of the temperature while the peak value of the specific heat capacity at a constant pressure in the critical and pseudocritical zone will gradually decrease with an increase in the pressure. However,the peak value in the critical and pseudocritical temperature zone will decrease with an increase of the pressure and the specific heat capacity in the high temperature chemical reaction zone will increase with an increase of the pressure.

关 键 词：定压比热 碳氢燃料 超临界压力 

分 类 号：TK311[动力工程及工程热物理—热能工程]