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Applicability of scaled testing for CAMUI-type hybrid rocket regression modelling

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Title: Applicability of scaled testing for CAMUI-type hybrid rocket regression modelling
Other Titles: CAMUI型ハイブリッドロケットの燃料後退モデルにおけるスケール則の適用性
Authors: Viscor, TOR Browse this author
Issue Date: 24-Mar-2022
Publisher: Hokkaido University
Abstract: Hybrid rocket engines have several advantages over liquid or solid engines but have traditionally seen limited use due to a low thrust-to-weight ratio. The Cascading Multi-Stage Impinging jet (CAMUI) hybrid rocket engine addresses this by using a series of impinging jets and fountain-like flow paths to improve mixing and increase heat transfer to the solid fuel surface. This thesis investigates the scaling of the CAMUI regression model over an extensive engine size range for the first time, comparing the model to actual firing data from over 30 hybrid rocket firing tests, ranging from 100 mm-diameter-2.5 kN-class engines to 400 mm-diameter-40 kN commercial class engines. With the development of a time-stepped regression simulator, identification and quantification of potential regression simulation uncertainties were performed. Burn time, specifically the effect of long start-up transients, was identified as the most critical. Further investigation into the impact of the transient burn time resulted in the proposed method of using burn time equivalent. This method considerably reduced the errors arising from the long start-up transients. Though done for the CAMUI engine, it was shown to be valid for other hybrid rocket engines. Lastly, with the proposed regression model corrections implemented, the simulator was used to design the successfully fired 40 kN-class engine. The developed model showed good scalability when evaluating the overall regression simulation model in the order of magnitude scaling range of 100 mm-diameter-2.5 kN-class engines to 400 mm-diameter-40 kN. This validates the scalability of the CAMUI concepts as well as its regression modeling to large-scale engines, opening the door for commercial implementation of CAMUI for suborbital and orbital-class rockets.
Conffering University: 北海道大学
Degree Report Number: 甲第14875号
Degree Level: 博士
Degree Discipline: 工学
Examination Committee Members: (主査) 教授 永田 晴紀, 教授 藤田 修, 教授 大島 伸行
Degree Affiliation: 工学院(機械宇宙工学専攻)
Type: theses (doctoral)
Appears in Collections:課程博士 (Doctorate by way of Advanced Course) > 工学院(Graduate School of Engineering)
学位論文 (Theses) > 博士 (工学)

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