以氦气为工质的行波热声发动机研究

随着对热声热机研究的深入，特别是行波热声发动机概念的提出，热声发动机效率得到了质的提高。为了实现热声发动机与制冷机的良好匹配，以氦气为工质时热声发动机需具有较低的起振温度、较大的压力波强度、较好的单频率特性。本文对自行研制的新型热声发动机进行了深入研究，以氦气为工质，在充气压力为2．0MPa时获得了1．19的压比，系统频率稳定在约73Hz，为利用新型热声发动机驱动脉管制冷机或其它热声制冷机创造了有利条件。此外，该热声发动机起振温度较低，初步具备了利用工业废热等低品位能源驱动的条件。

INVESTIGATION ON A TRAVELING-WAVE THERMOACOUSTIC ENGINE WITH HELIUM AS WORKING GAS

Thermoacoustic engines convert thermal engine. In order to obtain good match between thermoacoustic engine and thermoacoustic refrigerator, thermoacoustic engine with He as working gas should have relatively lower onset-temperature, large intensity of pressure oscillation, good mono-frequency characteristic. The self-made thermoacoustic engine charged with He of 2. 0 MPa, the maxim pressure ratio reaches 1. 19 and the operation frequency stable at about 73 Hz were investigated for driving a pulse tube refrigerator or other thermoacoustic refrigerator with good conditions. Moreover, this engine has lower onset-temperature; so it is possible to use thermal energy of low quality, such as industrially waste heat, solar energy and so on.