Investigation On Traveling Wave Thermoacous-Tic Engine And Thermoacoustically Driven Pulse Tube Refrigerator

Wide attention has been focused on thermoacoustic machines for their potentially high efficiency, simple configuration, reliability and working gas friendly to environment. A thermoacoustic engine takes thermal energy as direct driving source. Especially, low grade energy such as waste thermal energy from industrial processes and solar energy can be used, which is of great significance for environment protection. It is promising in liquefaction of natural gas, liquefaction and separation of oil associated gases, and cooling of electronic devices, and so on. In order to enhance the driving ability of the thermoacoustic engine and to optimize the matching between thermoacoustic engine and pulse tube refrigerator, this research emphasizes in designing and constructing efficient traveling wave thermoacoustic engine, exploring effective way to use low grade thermal energy, seeking methods to enhance the driving ability of thermoacoustic engine, and investigating the potential of thermoacoustically driven pulse tube refrigeration system to obtain cryogenic temperatures. The present work focuses on the following sections:1. Establishment of a Set of Mathematical Model of Traveling Wave Thermoacoustic Engines On the basis of former theoretical researches, a complete mathematical model has been set up for traveling wave thermoacoustic engines. Preconditions and conditions to solve the model are presented as well. Although the model is within the linear thermoacoustic theory frame, not including streaming and parameters of high orders, it covers most of the problems encountered in thermoacoustic field. Based on a simplified version of the model, working frequency of a traveling wave thermoacoustic engine is...