Study On The Resonant Jet-oscillator And Application

Static gas wave refrigerator is a type of machinery, in which self-induced jet oscillator is used to produce oscillation jet's periodical injection and come into oscillating tube with one-closed end. Energy is rapidly transferred from the injected gas to the intrinsic gas by way of propagation of those gas wave, which makes the temperature of the intrinsic gas increase and deliver the quantity of heat to the surrounding environment via the oscillating tube wall. The refrigerator has no running part and its seal components are simple. So its application is appropriate for the condition of high pressure. However, the research of the resonant gas wave refrigerator is few and far between theory and experiment. So, in this paper, the resonant oscillator is studied and used into the gas wave refrigerator.The numerical simulation and experiments are conducted to investigate the flow and thermal of the refrigerator and validate the results, including:(1) The oscillating apparatus is based on the theory of jet's wall-attaching effect which is also called Coanda effect, the performance of wall-attaching is the essential data for designing the gas wave refrigerator. To research on the property of the wall-attaching, numerical models were established and numerical analysis was applied to validate the results, including:it is not conducive to jet flow wall-attached to increase the expansion ratio; with the condition of oscillating, wide nozzle is welcome; the distance of wall-attached is longer as the smaller potential difference.(2) Within the gas wave refrigerator, the jet flow should oscillate with a certain range of frequency. In this paper, the resonant gas wave refrigerator was simulated numerically in integery, and the emphasis is mainly established in analysis on the pressure change of the gas in the oscillating tube, and the velocity distribution. The influence of operating parameter (e.g. pressure ratio) and geometry parameters (e.g. resonant cavity diameter and resonant tube) on the flow wall-attachment effect was studied. In order to understand oscillating frequency of gas wave refrigerator with different resonant line lengths and structure, the simulation was did.(3) The oscillation performance of jet, as oscillating frequency and refrigeration efficiency are the essential factor for the gas wave refrigerator. To analyze these how effect, an experimental equipment was set up and applied in the research on the wave movement within the receiving tube and the temperature of inlet and outlet. The oscillating frequency of the gas wave refrigerator is connected with the resonant tube, be independent of the resonant cavity and the operating condition. However, the refrigeration efficiency has the relationship with the resonant tube and the operating condition.