Investigation of Mixing, Diffusion, and Combustion Mechanism on Multi-species Fluid under Cryogenic High-Pressure Conditions

2021 Fiscal Year Final Research Report

• Project/Area Number: 19H02349
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 24010:Aerospace engineering-related
• Research Institution: Kyushu Institute of Technology
• Principal Investigator: Tsuboi Nobuyuki 九州工業大学, 大学院工学研究院, 教授 (40342620)
• Co-Investigator(Kenkyū-buntansha): 寺本 進 東京大学, 大学院工学系研究科(工学部), 教授 (30300700)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: ロケット / 航空宇宙工学 / 流体工学 / 熱工学 / 水素 / 超臨界流体

Outline of Final Research Achievements

The numerical and experimental studies on the cryogenic flow under the transcritical and supercritical pressures are performed to understand the thermodynamic characteristics and fluid dynamics. As for the multi-species flow simulations, the numerical method using a hybrid method between the energy equation and pressure　equation is developed. The numerical simulations can perform with numerical robustness for the hydrogen/oxygen advection problem and oxygen jet injected into hydrogen. Adiabatic mixing solution with energy-based solver and isochoric mixing solution with pressure-based solver are obtained for the coarse grid. In the experiments, using PIV, BOS, and the backlight method for cryogenic nitrogen jets, quantitative measurements become possible such as velocity distribution on the cross-section and unsteady variation mode for the jet central axis.

Free Research Field

熱流体工学

Academic Significance and Societal Importance of the Research Achievements

ロケットエンジンやガスタービンエンジンの高圧な流動現象を明らかにするために数値解析及び実験を行った．数値解析では計算が安定にできるように改良し，実現象をより明確に把握することが可能になり，将来的にはより効率的なエンジンの設計に適用できることが期待される．また，数値解析単独では検証が不十分であることから，検証にも必要な定量的な実験データを取得することができた．そして新たな物理現象の存在を明らかにした．