TED-AJ03-361 EXPERIMENTAL STUDY ON CRYOGENIC FLOW BOILING UNDER LOW GRAVITY

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概要

• 論文の詳細を見る

• In a future space infrastructure based on Orbit Transfer Vehicle (OTV), resupply technology of cryogenic fluid, especially heat management technology will be of importance. We investigated on cryogenic flow boiling under low gravity for establishment of fuel transfer technology on orbit. In the present experiments, we used a transparent heating tube, which can allow simultaneous temperature measurements and visual recordings. They were conducted under low gravity using Japan Microgravity Center (JAMIC) as well as under 1G. A schematic diagram of the experimental apparatus used in this study is shown in Figure A-1. At the start, GN_2,of which pressure was controlled by pressure regulator, expelled the LN_2 from its tank to a transparent heating tube of the test section. The flow direction was against gravity under 1G. The initial temperature of the test section was kept to the room temperature (about 300K). The flow behavior in the test section was observed by a CCD camera and the temperature of the innerwall of the tube was evaluated using the gold film as a resistance temperature sensor. [figure]Figure A-2 shows typical innerwall temperature histories taken under 1G and μG. The quenching time, which innerwall temperature became to the LN_2 temperature (73K), was about 1.2 times shorter than that under 1G. From those temperature histories, we obtained heat flux from the innerwall of the tube to LN_2 by using Fourier's law, and we found that maximum heat flux and minimum heat flux were about 1.4 times and 1.2 times larger than those under 1G respectively. In parallel with the temperature measurements, we succeeded in observation of advancing quench front, and we obtained that this advancing speed was about 1.2 times faster than under 1G for the same average mass velocity. The increase of quench front speed under μG coincides with the increase of heat flux and the decrease of quenching time. It was concluded from these results that heat transfer promotion of cryogenic flow boiling under low gravity was caused by the quench front speed increase.[figure]

• 一般社団法人日本機械学会の論文

著者

• OHTA Haruhiko

  Department of Aeronautics and Astronautics, Kyushu University

• AZUMA Hisao

  National Aerospace Laboratory

• Azuma Hisao

  Department Of Aerospace Engineering Osaka Prefecture University

• Ohta Haruhiko

  Department Of Aerospace Engineering Kyushu University

• Ohta Haruhiko

  Department Of Aeronautics And Astronautics Kyushu University

• HIEJIMA Toshihiko

  Department of Aerospace Engineering, Osaka Prefecture University

• KAWANAMI Osamu

  Department of Mechanical and System Engineering, University of Hyogo

• Kawanami Osamu

  Department Of Mechanical And System Engineering University Of Hyogo

• Hiejima Toshihiko

  Department Of Aerospace Engineering Osaka Prefecture University

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• CURRENT STATUS OF ROCKET DEVELOPMENTS IN UNIVERSITIES : DEVELOPMENT OF A SMALL ROCKET WITHOUT COMBUSTION PROCESS
• On-orbit Cryogenic Fluid Transfer Technique Using Swirl Flow Combined with Condensation by Spray Cooling : Preliminary Study of Microgravity Experiment and Thermal Analysis in Refilling Process
• TED-AJ03-361 EXPERIMENTAL STUDY ON CRYOGENIC FLOW BOILING UNDER LOW GRAVITY
• The Effects of Gravity on Cryogenic Boiling Heat Transfer During The Tube Quenching at Low Mass Velocity

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