Numerical analysis of acoustic field in standing wave thermoacoustic engine with different stack lengths

This paper deals with a CFD (Computational Fluid Dynamics) simulation of standing wave thermoacoustic engine composed of tube (resonator) and stack placed between two heat exchangers. Theoretical models are developed based on coupled compressible Navier-Stokes and heat transfer equations that govern the working gas. The study is performed to investigate the influence of stack length on the acoustic wave. The thermoacoustic effect has been firstly validated using numerical results obtained by using Ansys fluent in order to be used in the present investigation. It is found that the variation of stack length not only influences the acoustic pressure and frequency of the system, but also affects the acoustic field along the tube.