Performance of Mixture-Ratio-Controlled Hybrid Rockets Under Uncertainties in Fuel Regression
| Autor: | Toru Shimada, Kohei Ozawa |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
020301 aerospace & aeronautics
Materials science Sounding rocket Mechanical Engineering Aerospace Engineering Probability density function 02 engineering and technology Mechanics Mass ratio 01 natural sciences Flight simulator Regression 010305 fluids & plasmas Fuel Technology Propellant mass fraction 0203 mechanical engineering Space and Planetary Science Physical phenomena 0103 physical sciences Mass flow rate |
| Zdroj: | Journal of Propulsion and Power. 37:86-99 |
| ISSN: | 1533-3876 |
| DOI: | 10.2514/1.b37970 |
| Popis: | This paper evaluates various sources of oxidizer to fuel mass ratio (O/F) shifts in hybrid rockets and paths (physical phenomena) through which these O/F shifts affect flight performance. Moreover, the performance increase of O/F control in hybrid rockets is evaluated. Vertical launches of O/F uncontrolled and O/F controlled of hybrid sounding rockets were simulated under two uncertainty models of fuel regression behavior based on experimental data: a) systematic errors with a constant deviation within ±3σ±3σ and 2) random errors subject to a probability distribution. These simulations included all sources of O/F shifts that originated in the fuel regression behavior and all paths through which the O/F shifts affect flight performance. Residual propellant mass and decreases in specific impulse are found to be the dominant causes of performance loss under both uncertainty models. For both cases 1 and 2, the O/F-controlled hybrid rockets maintained the performance expected under nominal fuel regression behavior, whereas the O/F-uncontrolled hybrid rockets had a lower performance by upwards of 6.69 and 4.06% in ΔVΔV for cases 1 and 2, respectively. For case 2, 3008 flight simulations revealed that the worst case of the O/F-controlled hybrid rocket had a 4.06 to 4.49% larger ΔVΔV and 10.5 to 13.3% higher apogee than that of the O/F-uncontrolled hybrid rocket, and that the O/F-uncontrolled hybrid rocket had a 6.61 times larger standard deviation in ΔVΔV. These results mean that the elimination O/F shift in hybrid rockets significantly improves performance, as well as the accuracy and reliability of performance predictions. |
| Databáze: | OpenAIRE |
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