丙烷气相音速与理想气体比热的实验研究

STUDY ON SPEED-OF-SOUND AND IDEAL-GAS HEAT CAPACITY FOR GASOUS PROPANE

用球共鸣声学法测量了工质丙烷（Ｒ２９０）在温度分别为２９３．４８ Ｋ、３０２．９６Ｋ、３１３．２１Ｋ和３２３．１９Ｋ时，压力从２００ｋＰａ～７００ｋＰａ范围内的四条等温线共２８个音速数据。温度、压力和气体音速测量的不确定度分别为±１４ｍＫ、２．０ｋＰａ和±０．００３７％．根据实验数据，由热力学关系式得到了Ｒ２９０在四个温度下的理想气体比热和第二音速维里系数．同时根据现有的高精度实验数据拟合Ｒ２９０的理想气体比热方程．这些研究为Ｒ２９０在工程上的应用提供了必需的热物理性质基础数据．

Speed-of-sound, ideal-gas heat capacity and the second acoustic virial coefficient have been experimentally studied for gaseous propane, which is thought to be one of the important components of the alternatives for R22 and/or R12. Twenty-eight speed-of-sound values in gaseous propane were measured using a spherical resonator for pressure from 200 kPa to 700 kPa along with four isotherms at 293.48K、302.96K、313.21K and 323.19 K. The experimental uncertainties of temperature, pressure and speed-of-sound for propane are estimated to be ±14K、2.0 kPa and ±10.0037%, respectively. The ideal-gas heat capacity as well as the second acoustic virial coefficient has been deduced from the speed-of-sound measurements. The equation of ideal-gas specific heat capacity for propane was also proposed based on the reliable experimental data.