干涉法测量气体低压下声速的实验研究  

Sound speed measurements in gases at low pressures

作　　者：张昌[1] 段远源[2] 张重华[2] 史琳[2] 朱明善[2] 韩礼钟[2] 

机构地区：[1]武汉科技学院机械系,武汉430073 [2]清华大学热能工程系,北京100084

出　　处：《应用声学》2001年第2期23-26,共4页Journal of Applied Acoustics

基　　金：国家自然科学基金资助项目!(批准号:59906006)

摘　　要：介绍了干涉法测量气体声速的试验原理和变程干涉声速测量的实验系统，使用本套测量系统测得的气体声速的精度可达 ５ × １０－４．根据热力学原理，分析了气体声速与理想气体比定压热容之间的物理关系．在本套实验系统上测得了一批高精度的新环保制冷剂的气相声速数据，并可进一步确定其理想气体比定压热容．The principle of measurements of speed of sound in gaseous phase is discussed and a cylindrical variable-path acoustic interferometer is described. The uncertainty of speed of sound data measured in the experimental apparatus is estimated to be within 5 ×10-4. Based on thermodynamics, the relationship between the ideal-gas heat capacity at constant pressure and the speed of sound in the gaseous phase was analyzed. Speeds of sound for some new environmental friendly refrigerants were obtained and the corresponding ideal-gas heat capacities at constant pressure were also determined.

关 键 词：超声变程干涉仪 理想气体比定压热容 气体 声速测量 干涉法 

分 类 号：TB52[理学—物理] O354[理学—声学]