Earticle

초록

영어

It is difficult to fabricate and maintain moving parts of expander at cryogenic temperature. This paper describes numerical analysis and experimental investigation on a cryogenic reciprocating expander without moving piston. An intake valve which takes high-pressure gas, and an exhaust valve which discharges low-pressure gas, are connected to a tube. The inside pressure of the tube is pulsated for work production. This geometric configuration is similar to that of pulse tube refrigerator but without regenerator. An orifice valve and a reservoir are installed to control the phase of the mass flow and the pressure. At the warm end, a heat exchanger rejects the heat which is converted from the produced work of the expanded gas. For the numerical analysis, mass conservation, energy conservation, and local mass function for valves are used as the governing equations. Before performing cryogenic experiments, we carried out the expander test at room temperature and compared the performance results with the numerical results. For cryogenic experiments, the gas is pre-cooled by liquid nitrogen, and then it enters the pulse tube expander. The experiments are controlled by the opening of the orifice valve. Numerical analysis also found the expander conditions that optimize the expander performance by changing the intake pressure and valve timing as well as the opening of the orifice valve. This paper discusses the experimental data and the numerical analysis results to understand the fundamental behavior of such a newly developed non-mechanical expander and elucidate its potential feature for cryogenic application.

목차

Abstract
1. INTRODUCTION
2. NUMERICAL ANALYSIS
3. EXPERIMENTAL APPARATUS
4. COMPARISON OF EXPERIMENTAL RESULTS AND NUMERICAL ANALYSIS
4.1. Experiment and numerical analysis at ambient temperature
4.2. Experiment and numerical analysis at low temperature
5. ADDITIONAL EXHAUST LINE
6. CONCLUSION
ACKNOWLEDGMENT
NOMECLATURE
REFERENCES

키워드

저자

• Sehyeon Park [ Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Korea ] Corresponding Author
• Junhyuk Bae [ Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Korea ]
• Kyoungjoong Kim [ Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Korea ]
• Sangkwon Jeong [ Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Korea ]

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  한국초전도·저온논문지 (구 한국초전도저온공학회논문지) [Progress in Superconductivity and Cryogenics]

• 간기

  계간

• pISSN

  1229-3008

• eISSN

  2287-6251

• 수록기간

  1999~2026

• 등재여부

  KCI 등재,SCOPUS

• 십진분류

  KDC 427 DDC 537