| Thermoacoustic heat engines, which have some advantages, such as high reliability, no pollution, long non-maintenance, attracts more and more interest in academic circles. The development of thermoacoustic technology requires increasingly high specific power, and in turn requires high acoustic amplitude conditions which produce various nonlinear effects, in this case, linear thermoacoustic theory can not provide satisfactory predictions. It is necessary to investigate new simulation analysis method. Therefore, it is an exploring work that using lattice gas method simulated thermoacoustic engines. Based on the formers'work, the research work has been focused on following points:1. A D2Q13 lattice gas model for thermoacoustic engines is built initially, which is an exploring work. The collision rule and border is designed. The results of the curve of the temperature response in thermoacoustic engines, which is logical, shows the assumption is feasible.2. A resonant cavity of thermoacoustic engines is simulated and analyzed using D2Q9 lattice gas model. The onset process is compared between resonant cavity model and straight tube model and, The temperature distribution and temperature gradient along the direction of tube length is simulated. The propagation and reflection of the pressure wave in one cycle after steadily has been analyzed preliminarily. The results shows, the pressure amplitude is magnified in the resonant cavity model and, emerged at the two closed-end of the resonator. It is consistency with theory.3. The influence of the muti-particles collision rule is considered, and shows the nonlinear effects is more clear. Moreover, the pressure amplitude is magnified by the larger hot temperature.4. The flow field of resonator is analyzed. The horizontal oscillation velocity in the stack is disposed and the field near the hot exchangers is visualized. The period oscillation of the velocity and the mutation of the flow field near the heat exchangers is reflected. |
PDF Full Text Request