Investigation on a Thermoacoustic Heat Engine unit with a Displacer
A novel thermoacoustic heat engine — double-acting travelling wave thermoacoustic heat engine has been proposed by our research group recently.It consists of at least three symmetric engine and resonator units and has advantages on efficiency,power density and heat source flexibility.However,3D computational and experimental results indicate a dramatic heat loss caused by the jet-flow in the thermal buffer tube due to the structures of the high temperature heat exchanger and the secondary ambient heat exchanger at its two ends.To solve this problem,a displacer locating in the thermal buffer tube is proposed to suppress the jet-flow.Moreover,the displacer is capable of isolating the hot region from room temperature,which provides an opportunity to eliminate the secondary ambient heat exchanger.In order to investigate such a double-acting thermoacoustic heat engine,a test rig of the engine unit has been developed by utilizing two linear motors to provide real operational conditions in the system.In this paper,a numerical simulation is performed to reveal the influences of the displacer on the system performance.According to the numerical results,the impact of displacer is very limited when the displacer is working under the resonant state.In addition,the influences of spring constant and mechanical damping coefficient of the displacer are analysed in detail respectively.
Double-acting Thermoacoustic Heat Engine Displacer
Shuang Zhang Zhanghua Wu Ruidong Zhao Wei Dai Ercang Luo
University of Chinese Academy of Sciences,Beijing 100049,China Key Laboratory of Cryogenics,Chinese Academy of Sciences,Beijing 100190,China
国际会议
桂林
英文
1-10
2013-07-16（万方平台首次上网日期，不代表论文的发表时间）