• 제목/요약/키워드: Pulse tube

검색결과 253건 처리시간 0.032초

맥동관 냉동기 열교환기에 관한 실험적 연구 (An Experimental Study on the Heat Exchangers in the Pulse Tube Refrigerator)

  • 남관우;정상권;정은수
    • 설비공학논문집
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    • 제12권3호
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    • pp.284-291
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    • 2000
  • A basic pulse tube refrigerator has been constructed with extensive instrumentation to study the characteristics of the heat exchanger experimentally under the oscillating pressure and the oscillating flow. This paper describes the sequential experiments with the basic pulse tube refrigerator. The experiments were performed for various cycle frequencies under the square pressure wave forms. First, the heat flux was measured through the cycle at the both cold and warm end heat exchangers without the regenerator. In order to enhance the thermal communication capability of the heat exchanger with the gas at low operating frequencies, a unique design of the triangular shape radial fin concept was applied to the heat exchangers. For the fin heat exchanger, the measured heat flux and the calculated heat flux from the two well-known oscillating heat transfer correlations were compared and discussed. Second, the regenerator was added to the pulse tube to make a basic pulse tube refrigerator configuration. The experiment showed the great impact of the regenerator on the temperature and the heat flux profiles. At the warm-end, the cyclic averaged heat flux had its maximum value at the specific operating frequency. The paper presents the explanation of the surface heat pumping effect as well as the experimental data.

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유체가 흐르는 튜브 라인의 기하학적 형상에 따른 진동해석 (Vibration Analysis on the Variable Configurations of Tube Conveying Fluid)

  • 유계형;김영권;신귀수;박태원
    • 한국안전학회지
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    • 제16권1호
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    • pp.25-30
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    • 2001
  • This paper studies the effect of vibration characteristics of tube line conveying fluid with the power steering system of bus. We modelled fluid-filled tube line using I-DEAS software to investigate vibration characteristics of the power steering tube line. And we obtained the natural frequency of tube line through finite element analysis. Analytic solutions were compared with experimental solutions to verify finite element model. We tested the tube line to examine an effect of pressure pulse by vane pump and variation of geometry of tube. From both the experimental results and the modeling results for vibration characteristics of the tube line conveying fluid, we confirmed that vibration characteristics induced by pulse propagated along the power steering tube line and resonance occurred around the natural frequency with pulse excitation.

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맥동관 엔진의 구현 가능성에 대한 연구 (Investigation on feasibility of pulse tube engine)

  • 기태경;정상권
    • 한국초전도ㆍ저온공학회논문지
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    • 제14권1호
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    • pp.34-37
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    • 2012
  • In this paper, configurations and performance of a pulse tube engine (PTE) are investigated. The configuration of PTE is basically designed by using a concept of energy flow. The configurations of PTE are classified as a PTE with two pistons and a PTE with one piston. First, the PTE with two pistons is simulated and the Carnot efficiency is about 41 %. The phase difference of between motion of two pistons located at expander and compressor mainly effects the performance of the PTE. Second, the PTE with one piston is designed. From a concept of analogy, the piston of compressor is replaced by a compliance tube and a resonator. The PTE with one piston is identical with a thermoacousic engine and has the large volume because the compliance tube and resonator are consisted of large volume tubes. Therefore, we will consider each usefulness of the compact PTE with two pistons and the huge PTE with one piston for PTE applications and the judgement of feasibility.

관성관 맥동관 냉동기의 성능에 관한 해석적 연구 (The Study of the performance analysis of the inertance Pulse Tube refrigerator)

  • 홍용주;박성제;김효봉;최영돈
    • 한국초전도저온공학회:학술대회논문집
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    • 한국초전도저온공학회 2003년도 추계학술대회 논문집
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    • pp.159-162
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    • 2003
  • Cooling with easy, reliable cryocooler is highly desirable for the commercial and military application The pulse tube refrigerator has no moving parts at the cold end, so that the mechanical vibration and magnetic noise can be reduced to the low level with higher relaibility and longer lifetime than the Stilting cryocooler. The inertance tube improve the performance of pulse tube refrigerator by providing optimal phase shift between pressure and amss flow rate, and it is easiest to implement at large cooling capacity and high operating frequency. In this study, the performance of the inertance pulse tube refrigerator was investigated by analysis. The results show the influence of the diameter and length of the inertance tube on the performance of the refrigerator.

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맥동연소기 도관에서의 열전달 해석 (An Analysis of Heat Transfer in the Flue Tube of a Pulse Combustor)

  • 김창기;차상명;박희용
    • 설비공학논문집
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    • 제4권1호
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    • pp.20-32
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    • 1992
  • A numerical solution for heat transfer in the flue tube of a pulse combustion water heater was presented. The $k-{\varepsilon}$ turbulent model was adopted to describe turbulent characteristics and radiative heat transfer was calculated by P-N approximation. Three pulsating conditions equivalent to existing experimental studies were used for analysis. Pulsating pressure was specified at the inlet and outlet of flue tube and numerical procedure using control volume method and pressure boundary condition was presented. It was found that the present mathematical model and numerical method could predict effectively the flow field and heat transfer for the flue tube in pulse combustor.

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기체 레이저용 진공관식 펄스 전원 (A vacuum tube based pulse generator for gas lasers)

  • 진정태;차병헌;남성모;이흥호
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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    • pp.221-223
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    • 2002
  • This paper describes a vacuum tube based high voltage pulse generator for pulsed gas lasers. The pulse generator delivers 20 kV, 300 A pulse outputs with more than 10 kHz pulse repetition rates It can be controlled its Pulse width from 30 ns to 80 ns continuously without any hardware change.

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전자장 pulse 하의 금속 Cylinder의 팽창에 대한 연구 (Numerical Analysis of the Expansion of a Metalic Cylinder Under Electormagnetic Pulse)

  • 서주하
    • 산업기술연구
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    • 제8권
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    • pp.71-80
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    • 1988
  • 높은 전압으로 충전된 Capacitor를 순간적으로 원통형 coil에 방전하면 순간적으로 강한 전자장 impulse가 발생한다. 이때 coil를 둘러 싼 금속 tube는 radial 방향의 힘을 얻어 팽창한다. 본 논문은 이때 tube내의 전자장분포와 tube 벽의 움직임을 integral equation method를 사용하여 해석하였다.

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맥동관 내부의 열전달에 관한 실험적 연구 (Experimental study on the transfer in pulse tube)

  • 김민규;남관우;정상권;장호일;정은수
    • 한국초전도ㆍ저온공학회논문지
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    • 제2권1호
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    • pp.45-50
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    • 2000
  • The present study has been conducted to observe the heat transfer under pulsating pressure and oscillating flow. The experimental apparatus was fabricated to measure the gas temperature, the wall temperature. the pressure and the instantaneous heat flux inside the pulse tube. The measured gas temperature and heat flux must be calibarated to compensate their finite time constant in the oscillating flow conditious. The experiment was performed from 1 Hz to 5 Hz. The phase difference between the instantaneous heat flux and the gas-wall temperature difference was clearly observed. The experimental heat fluxes were compared to the theroretical correlations such as Complex Nusselt Number Model(CNNM) and Variable Coefficient Model(CVM). The heat flux predisted by CNNM was always greater than that of VCM. The experiment confirmed the valisity of the VCM for the instantaneous heat flux under the pulsating pressure and oscillating flow in the warm end of the pulse tube.

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네온을 작동유체로 하는 GM형 맥동관 냉동기의 실험적 연구 (Experimental study on GM-type pulse tube refrigerator with neon as working fluid)

  • 김효봉;박종호
    • 한국초전도ㆍ저온공학회논문지
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    • 제13권3호
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    • pp.31-35
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    • 2011
  • This paper describes experimental study on GM-type pulse tube refrigerator with neon as a working fluid instead of helium. Neon gas has similar compression characteristics with helium gas because it is a monoatoimc gas. In experiments, a cooling performance test was performed with same compressor and pulse tube refrigerator for neon and helium as working gas. From experimental results, a PTR with neon show the improved cooling performance than a PTR with helium. Cooling performance and operating characteristics of a PTR were discussed and compared for two different working gas.

오리피스 맥동관 냉동기의 수치적 해석 (Numerical Analysis of an Orifice Pulse Tube Refrigerator)

  • 이강선;정은수;최헌오
    • 설비공학논문집
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    • 제6권3호
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    • pp.282-290
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    • 1994
  • A numerical model for the analysis and design of orifice pulse tube refrigerators has been developed. Heat transfer coefficient and friction factors in the model vary with time, and the real physical properties such as thermal conductivity and viscosity were used to improve the accuracy of the model. Thermodynamic behavior of the working fluid within pulse tube refrigerators was investigated and the effect of design parameters, such as reservoir volume, orifice diameter, and NTU of regenerator, on the cooling load and COP was shown.

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