Evaluation of heat transfer characteristics of liquid oxygen flow with phase change and phase distribution under high heat flux conditions in a thin tube

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K04852
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 24010:Aerospace engineering-related
• Research Institution: Kyushu Institute of Technology (2020-2021); Japan Aerospace EXploration Agency (2019)
• Principal Investigator: Kitagawa Koki 九州工業大学, 大学院工学研究院, 准教授 (10575476)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: ハイブリッドロケット / 液体酸素 / 再生冷却 / 熱伝達 / 二相流 / ノズル / 熱流束 / 気化

Outline of Final Research Achievements

The author has succeeded in developing a heat transfer characteristic measurement experimental system to clarify the heat transfer characteristics of a liquid oxygen flow under high heat flux conditions, which is a thin tube simulating a regenerative cooling nozzle of a hybrid rocket. As a function verification test, cold flow tests and a tube unit heating tests were conducted, and the characteristics of the measurement system were understood. Liquid oxygen heat transfer characteristic measurement experiments were carried out. A calculation method to estimate heat transfer characteristics from experimental data was constructed, and the heat transfer coefficients were estimated. By comparing with the heat transfer coefficient obtained from the existing heat transfer correlation equation, it was clarified that there is a difference in the phenomenon.

Free Research Field

宇宙推進工学

Academic Significance and Societal Importance of the Research Achievements

ハイブリッドロケットは、本質的非爆発性の画期的な推進システムであり、来る高頻度宇宙輸送時代の輸送システムに適している。実用化のためには、液体酸素を気化した上で、旋回流として燃焼室に噴射し、高効率な推進力を得ることが不可欠である。本研究では、液体酸素の熱伝達特性を明らかにし、システムを開発するために必要な液体酸素気化に関する基礎データを蓄積することができた。この結果は、ハイブリッドロケット実用化の促進に貢献するものであり、将来的には宇宙開発の発展につながる。