Characteristic Study And Of Regenerators Under Oscillatory Flow

Striling refrigerator is widely used as their many advantages, and many scholars have put a lot of research on how to improve its efficiency. As one of the key components, regenerator's performance has directly effects on the efficiency and characteristics of the whole machine. Following lots of researches and the development of Striling refrigerator technology, the nature of the regenerator is constantly to be understood, and the regenerator experimental performance and by which obtaining relevant equations have made great breakthrough in the steady-state flow. In fact, regenerator is working in oscillation flow conditions, and the flow and heat transfer characteristics have obvious difference compared to the conditions, especially in high frequency oscillation of Stirling machine, which has a great error using the stability conclusions. Therefore, the researches of regenerator characteristics in oscillation flow conditions are very important.This study is mainly to resistance character of regenerator for experimental study and numerical simulation in the oscillation flow conditions. At the same time, it's provided the experimental platform to be used regenerator tested and studied its resistance characteristic in different parameters at the variety of conditions. Firstly, the needed components which are needed to design in the test bed are calculated and regenerator resistance characteristic of the platform is prepared in the oscillation flow conditions, which provides actual working environment for the regenerator. Dynamic pressure drop characteristics of the regenerator are studied in the conditions of various porosities, screen stacked length and screen stacked ways when existing temperature difference on both ends. Experimental results show that the length of the screen type regenerator and porosity have significant effect on the pressure drop characteristics of the both ends, which has a on a linear relationship. However, in the same conditions, the regenerator screen stack way is no influence. In addition, when the regenerator ends is added certain temperature, the pressure drop characteristics is increasing linearly with the temperature. Secondly, the board fold and screen regenerator are analyzable by numerical simulation. As a simple structure regenerator, the board fold regenerator is analyzable the effect of viscosity when medium after board fold the channel and speed oscillations by the cause of pressure oscillations, which calculate the velocity distribution on the cross section. For the porous medium model of screen regenerator, the influences of dynamic characteristics are studied on regenerator factors such as porosity, flow and frequency, which verify the experimental conclusion and provide for certain instructional roles for machine optimum design.Moreover, the problems which are encounter in the course of study and the solving methods are detailed introduced. The specific settings of regenerator in numerical simulation are simply introduced.