Investigation of Graphite Nozzle Erosion in Hybrid Rockets Using Oxygen/High-Density Polyethylene
| Autor: | Harunori Nagata, Kazuhito Sakurai, Shota Hirai, Landon T. Kamps, Naoto Adachi, Raymond Guan, Tor Viscor, Mitsunori Itoh, Yuji Saito, Hikaru Isochi |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
business.product_category Mechanical Engineering Nozzle Aerospace Engineering chemistry.chemical_element Thermal diffusivity Oxygen Chamber pressure Fuel Technology chemistry Rocket Space and Planetary Science Thermocouple Graphite High-density polyethylene Composite material business |
| Zdroj: | Journal of propulsion and power. 36(3):423-434 |
| ISSN: | 0748-4658 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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