毛细管绝热节流过程焓变化特性的理论分析与实验验证

Analysis and Experimental Verification for Enthalpy Characteristics of Adiabatic Throttle Process in Capillary Tube

计算分析了焓相等和滞止焓相等情况下毛细管中R22节流特性参数及其变化规律,并将两种情况下所选取的毛细管与真实制冷系统毛细管比较。理论计算和实验结果都表明滞止焓相等才是毛细管绝热节流的基本特性,而绝热节流焓相等的理论不够准确。

Throttle characteristic parameter and its variation of R22 in capillary tube are studied under two conditions：enthalpy and stagnation enthalpy are conserved respectively. The capillary tubes selected on the two conditions are compared with an realistic capillary tube in a refrigerator respectively. The basic character that the stagnation enthalpy is conserved is shown to be correct, which is proved by theoretic calculation and experiment. The enthalpy is shown not to be conserved.