Two-port network model and startup criteria for thermoacoustic oscillators
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- 作者：XingHua Hu (1)
XiaoQing Zhang (1)
HuiLing Wang (1)
ShuiMing Shu (1) - 关键词：thermoacoustic engine ; two ; port ; oscillator ; Nyquist criterion ; startup oscillation
- 刊名：Chinese Science Bulletin
- 出版年：2009
- 出版时间：January 2009
- 年：2009
- 卷：54
- 期：2
- 页码：335-343
- 全文大小：552KB
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XiaoQing Zhang (1)
HuiLing Wang (1)
ShuiMing Shu (1)
1. Institute of Refrigeration and Cryogenics, Huazhong University of Science and Technology, Wuhan, 430074, China - ISSN：1861-9541
文摘
The startup process of a thermoacoustic engine is a self-excited oscillation process generated in inhomogeneous acoustic media. To reveal these coupling relations between various influential factors is an important task of basic research on thermoacoustics. In this paper thermoacoustic engines are regarded as thermoacoustic oscillators consisting of the active network and the passive network. Accordingly, the two-port Y-parameter for relevant component is derived, and standing wave and traveling wave thermoacoustic engine are described by the negative-resistance and feedback model, respectively. The relevant two-port network topology is given as well. The startup criteria for thermoacoustic oscillators are obtained by using Nyquist instability criterion. The model prediction of startup parameters, particularly, startup frequency and mode characteristic are in agreement with that of experimental results reported in the literature. Moreover, with topological graphs it is verified that standing wave engines would start up in a negative-resistance state and there would exist high frequency modes in thermoacoustic-Stirling engines. By investigating into the frequency response of thermoacoustic system, this method proposed can achieve such an objective that these effects of operating and structural parameters of engine on startup modes and startup temperature can be revealed in an analytical way. Thus this approach to test and check thermal stability can be provided in a design phase, instead of using empirical frequency to design thermoacoustic systems.