Abstract
A gas wave refrigerator is a device that uses gas pressure to expand and refrigerate; the moving shock wave in the gas wave tube is the key to cooling. If the shock wave is reflected to the open mouth of the gas wave tube, it will heat the expanded refrigeration gas at the open end, severely reducing the refrigeration efficiency. In order to reduce this effect, a Helmholtz middle wave chamber-type gas wave tube is presented here. This study describes the performance of this structure in the gas wave refrigeration process. The refrigeration performance of the structure’s gas wave tube use was evaluated experimentally and numerically using computational fluid dynamics (CFD). The function of the middle wave elimination chamber was studied and explained: the chamber turns the reflected shock wave back to the end section of the tube and converts part of the incoming shock wave to an expansion wave, which may counteract the reflected shock wave by escaping from wave elimination chamber. The experimental results showed that the structure increased refrigeration efficiency by about 2.9% (50 Hz), 2% (40 Hz), and 2.2% (25 Hz) at the corresponding ejection frequencies, and reduced the reflected shock wave intensity by 11%, which proves the high-efficiency energy dissipation performance and the significant increase in refrigeration efficiency of the Helmholtz-type gas wave tube.
Highlights
Due to the high storage and transportation risk factors, the efficient use of pressure energy has long plagued researchers
We proposed and studied the Helmholtz-type wave-elimination chamber structure, which was used to enhance the incident shock wave, prevent the return of the reflected shock wave, and fold the reflected shock wave back to the back section of the gas wave tube to accelerate energy dissipation and reduce the impact on the exit position of the reflected shock wave
The gas wave tube structure of the static gas wave refrigerator was optimized by the method of combining computational fluid dynamics (CFD) numerical simulation and experimental studies
Summary
Due to the high storage and transportation risk factors, the efficient use of pressure energy has long plagued researchers. In order to efficiently use the ejection pressure energy and reduce the reflected shock wave, one should try to reconstruct the distribution and reflection of the wave system in the gas wave tube, improve the shock wave forward path, block the shock wave reflection, and increase the dissipation in the back section of the gas wave tube, improving shock wave attenuation According to this idea, we proposed and studied the Helmholtz-type wave-elimination chamber structure, which was used to enhance the incident shock wave, prevent the return of the reflected shock wave, and fold the reflected shock wave back to the back section of the gas wave tube to accelerate energy dissipation and reduce the impact on the exit position of the reflected shock wave. Improve thethe efficiency of aofstatic gas gas wave
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