Z函数图解积分法计算气体逸度

A Calculation Method on Gas Fugacity by Z Function of Graphcial Integation

摘要: 本文讨论了传统计算气体逸度的准确方法——α函数图解积分法,在实际计算中的麻烦和误差。并指出了当压力趋近于零而α函数不为零的原因。
本文提出的Z函数图解积分法,利用原试验数据仅改变图解积分的函数形式,就克服了α函数法的缺点,并指出了α函数法计算误差的性质,又为Z函数近似计算法的应用条件和适用范围做了说明,从而得到一个在理论解释和计算误差上,都优于α函数的方法。具有实际意义的是,Z函数法可估计出气体服从理想气体方程式的压力范围。

Abstract: A calculation method of gas fugacity,traditional a function method,has been discussed on its complexity and error.The error of a function method consists in the inequality between its value and that value when the pressure is close to zero. The substitution of Z function for a function, it shows that the deficiency of a function can be overcomed. The conditions and range of applications of Z function are also explained.One of the advantages is to estimate the field of pressure that obeies the perfect gas law so that it is used widely in practice.