| Thermoacoustic engine is a kind of device of converting the heat energy into acoustic power,it has many advantages such as no pollution, no moving parts and so on.Conversion efficiency of traveling-wave thermoacoustic engine is up to 0.3, which can be comparable to a conventional engine.This paper is based on the basic theory of thermoacoustic, which uses acoustic-electric analogy and combines with the existing swift thermoacoustic network theory,analyszing traveling-wave thermoacoustic engine of using lumped parameter method and establishing a complete network model diagram of traveling-wave thermoacoustic engine.It uses thermoacoustic network model to calculate the phase difference of regenerator and amplitude of the pressure antinode as well as compared with the result of DeltaEC. The influence of porosity and the length of regenerator resonance tube on system performance is analyzed, and it provides theoretical guidance for design of thermoacoustic engine.A traveling-wave thermoacoustic engine based on thermoacoustic network model is designed by using DeltaEC software, it is studied experimentally and utilize helium as the working medium. The influence of the system inflated pressure and system heating power on system frequency, oscillation amplitude and pressure ratio is anasyzed quantitatively.Beyond that, the relationships between the heating power and frequency, acoustic power and pressure ratio are obtained when pressure was constant as well as the relationships of system pressure and frequency, acoustic power and ratio are obtained when the heating power was constant.The way to improve the thermoacoustic efficiency was proposed,utilizing the least cost to get the maximum benefit has been realized, so it makes thermoacoustic engine toward a practical step. |
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