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Investigation of Graphite Nozzle Erosion in Hybrid Rockets Using Oxygen/High-Density Polyethylene

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Title: Investigation of Graphite Nozzle Erosion in Hybrid Rockets Using Oxygen/High-Density Polyethylene
Authors: Kamps, Landon Browse this author
Hirai, Shota Browse this author
Sakurai, Kazuhito Browse this author
Viscor, Tor Browse this author
Saito, Yuji Browse this author
Guan, Raymond Browse this author
Isochi, Hikaru Browse this author
Adachi, Naoto Browse this author
Itoh, Mitsunori Browse this author
Nagata, Harunori Browse this author →KAKEN DB
Issue Date: May-2020
Publisher: The American Institute of Aeronautics and Astronautics
Journal Title: Journal of propulsion and power
Volume: 36
Issue: 3
Start Page: 423
End Page: 434
Publisher DOI: 10.2514/1.B37568
Abstract: A recently developed reconstruction technique is used to investigate graphite nozzle erosion in two scales of hybrid rocket motors, 30-N-thrust class and 2000-N-thrust class, using oxygen as the oxidizer and high-density polyethylene as the fuel. Thermocouple measurements taken from within the nozzles are used to estimate nozzle throat wall temperature. Forty-four static firing tests were conducted under varying experimental conditions to confirm the validity of the reconstruction technique results, to investigate the conditions at the onset of erosion, and to formulate an empirical predictive model of nozzle erosion rate. Results show that a single formula that treats the combustion gas as a single oxidizing agent for which heterogenous rate constants are functions of equivalence ratio can satisfactorily replicate the erosion rate of graphite by a combustion gas containing multiple oxidizing species. Furthermore, the chemical-kinetic-limited conditions of the onset of nozzle erosion are specified by a novel empirical correlation, which shows that erosion begins at lower temperature and pressure in oxidizer-rich combustion gas than in fuel-rich combustion gas.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: Kamps Landon Thomas

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