Reconstruction techniques for determining O/F in hybrid rockets

Yuji Saito, Landon Kamps, Ayumu Tsuji, Harunori Nagata

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)

Abstract

In this study, the accuracy of reconstruction techniques for determining instantaneous O/F (oxidizer to fuel mass ratio) is investigated using numerical firing tests for which O/F and ηc∗ (efficiency of characteristic exhaust velocity, c) are known. Six methods are introduced and compared: OPMA-F-C (constant c), OPMA-F-E (constant ηc∗), OPMA-F-CE (to avoid the multiple solutions problem), OPTMA-FE-L (constant thrust coefficient, λ), OPMA-F-CE (modified CEA), and OPTMA-FE-L (modified CEA). The calculation results show the advantages and disadvantages for each method in cases of noisy data, multiple solutions problem, and O/F and ηc∗ shifts. For the multiple solutions problem, the OPMA-F-CE method is recommenced for the O/F and ηc∗ calculations. In the case of the O/F shift, the OPMA-F-E, OPTMA-FE-L, OPMA-F-E (modified CEA), and OPTMA-FE-L (modified CEA) methods are recommenced for the O/F and ηc∗calculations, however, when the O/F is shifting within the multiple solutions range, an accurate O/F result is not obtained by any of the methods in this study. In the case of the ηc∗ shift, the OPTMA-FE-L and OPTMA-FE-L (modified CEA) methods are recommended because ηc∗ is not constant in these methods. However, in the case where ηc∗ and O/F shifts occur and there is noise in the multiple solutions range, an accurate O/F cannot be obtained by any of the methods.

Original languageEnglish
Title of host publicationAIAA Propulsion and Energy Forum, 2021
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624106118
DOIs
Publication statusPublished - 2021
EventAIAA Propulsion and Energy Forum, 2021 - Virtual, Online
Duration: 2021 Aug 92021 Aug 11

Publication series

NameAIAA Propulsion and Energy Forum, 2021

Conference

ConferenceAIAA Propulsion and Energy Forum, 2021
CityVirtual, Online
Period21/8/921/8/11

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