Design method for three-level thermal coupling type high-frequency pulse tube refrigerating machine based on entropy analysis

Abstract

The invention discloses a design method for a three-level thermal coupling type high-frequency pulse tube refrigerating machine based on entropy analysis. The design method includes six steps that firstly, a model is established; secondly, a reasonable fundamental assumption is established, and the model is simplified; thirdly, the performance of the first level is analyzed based on entropy analysis; fourthly, the performance of the second level is analyzed based on the previous research; fifthly, the previous analysis result is substituted into the third level, and the analysis relation between the refrigerating performance of the third level and various levels of work parameters is obtained; and sixthly, various work parameters including the input sound power, the refrigerating temperature, the inflation pressure, the pressure ratio, the work frequency, the thermal regenerator size, the thermal bridge connecting position, the cold storage padding and the like of various levels are optimally designed according to actual needs based on the simulation result, and the optimal work state is achieved. According to the design method, various irreversible losses can be obviously reduced, the refrigerating efficiency of a system is improved, and important significance is achieved for practical development of the three-level thermal coupling type high-frequency pulse tube refrigerating machine.

Description

technical field [0001] The invention relates to the field of refrigeration and low-temperature engineering, in particular to a design method of a three-stage heat-coupled high-frequency pulse tube refrigerator based on entropy analysis. Background technique [0002] Internationally, low-temperature refrigeration technology has developed rapidly in the past half a century, and has been widely used in aerospace, national defense, superconducting industry, medical treatment, energy, and low-temperature physics. The deep low temperature region as low as 10K and below has irreplaceable applications in the fields of very long-wave infrared detection, terahertz detection, X-ray detection, and low-temperature superconductivity. Compared with cryogenic liquid Dewar, the mechanical refrigeration method is small in size, light in weight, easy to maintain, and has a long working life. It has great advantages in mobility, reliability, and service life. It has more obvious advantages in a...

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Problems solved by technology

[0003] Multistage pulse tube refrigerators are mainly divided into heat-coupled type and gas-coupled type. Internationally, attempts have been made to adopt their own design methods for these two types of multi-stage systems, but no effective and recognized design has been summarized yet. in principle

Especially for the design method based on entropy analysis for the three-stage high-frequency pulse tube refrigerator, there is no report in the open literature

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