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本文用流体的压缩性系数Z、导数压缩性系数Z_P、Z_T及比热的特定关系式来表述常遇的含有热力偏导数的流体热力性质。为了推荐Z_P、Z_T的通用计算公式及图表,本文导出了Lee-Kesler方程导数压缩性系数Z_P~（（O）or（R））、Z_T（（O）or（R））的分析表达式。在P_r=0.1—10、T_r=0.3—4范围内,算得L-K方程Z_P（（O））、Z_P（（l））、Z_T（（O））、Z_T（（l））数值并列成表格。所提供的Z_P（（O）or（R））、Z_T（（O）or（R））表达式或表格,可用来机算或手算非极性和轻微极性流体的热力性质,诸如流体等熵指数、流体声速、等压及等容比热比、比热差等。 对CO_2、F-22、N_2进行了上述热力性质计算,所得结果和有关文献比较,误差在工程允许范围内。
In this paper, the thermodynamic properties of the fluid with partial thermal conductivity, which are often encountered, are described by the compressibility factor Z, the derivative compressibility coefficients Z_P, Z_T and the specific heat of fluid. In order to recommend general formulas and diagrams of Z_P and Z_T, the analytical expression of the derivative of the compressibility Z_P ~ (O) or (R) and Z_T ((O) or (R)) of the Lee-Kesler equation is derived. The values of Z_P ((O)), Z_P ((l)), Z_T ((O)) and Z_T ((l)) of L-K equations are listed in the form of P_r = 0.1-10 and T_r = 0.3-4. The provided Z_P ((O) or (R)), Z_T ((O) or (R)) expressions or tables can be used to calculate or calculate the thermodynamic properties of nonpolar and slightly polar fluids such as fluids Isentropic index, fluid velocity of sound, isobaric and isobaric specific heat ratio, specific heat differential. The thermodynamic properties of CO_2, F-22 and N_2 were calculated. The results obtained were compared with those of the related literatures. The errors were within the allowable range of the project.