湿空气绝热节流系数计算及讨论
Calculation and discussion of adiabatic throttling coefficient for moist air
摘要：
基于修正的PR方程（MPR方程）与压缩因子方程，将焦耳-汤姆孙系数的计算转化为压缩因子在等压条件下对温度的偏导数的计算，提出了一种计算湿空气绝热节流系数的方法。对该方法进行了验证，首先计算了饱和湿空气的压缩因子，与相关文献的数据进行了比较；其次计算了不同压力、不同温度下氧气的焦耳-汤姆孙系数，与基于实验数据的经验公式的计算值进行了比较，结果均表明此方法具有较高精度。最后分析了温度、压力及含湿量对湿空气绝热节流系数的影响，并比较了MPR方程和PR方程的计算结果。
Abstract：
Based on the modified PR equation(MPR equation) and the compression factor equation, changing the calculation of the Joule-Thomson coefficient into the calculation of partial derivative of the compression factor to temperature in the constant pressure condition, deduces a calculation method of the adiabatic throttling coefficient for moist air. In verifying this method, firstly calculates the compression factor of saturated moist air and compares it with the data from related literatures; secondly calculates the Joule-Thomson factors of the oxygen gas in different pressures and temperatures condition and compares them with the calculation values by an empirical formula based on experimental data, with the results showing that the method has higher accuracy; finally analyses the influence of the temperature, pressure and humidity ratio on the adiabatic throttling coefficient of moist air, and compares the calculation result by MPR equation and that by PR equation.
Keywords:moist air, adiabatic throttling, Joule-Thomson coefficient, MPR equation, compression factor