Stored chemical energy propulsion system (SCEPS) reactor injector performance prediction modeling with experimental validation
- Restrictions on Access:
- Open Access.
- A quasi one-dimensional compressible-flow model has been developed to characterize the thermodynamic state of gas injectors within stored chemical energy propulsion systems (SCEPS). SCEPS take the form of a batch reactor with a metal fuel and gaseous oxidant. The result is a high-heat, molten metal bath with a reacting gas jet under vacuum pressure conditions. The developed model incorporates the combined effects of Fanno (frictional) and Rayleigh (heat) flow, including entropic predictions of sonic flow conditions. Constant, converging, and diverging-area, Reynolds-scaled nozzle profiles were exercised to demonstrate the capability of the model in forecasting varied flow regimes that may occur in SCEPS injectors. Physical nozzles, with identical geometric profiles to those of the model cases, were then tested for these nozzle conditions in order that the fidelity of the model could be evaluated. The test results validated the models static pressure prediction for each nozzle case by producing the same distribution of pressures on the same order of magnitude. The order of temperature values was also validated, although greater divergence from the model predictions occurred toward the latter half of each nozzle. Overall, the model proved to be capable of approximating the same general flow characteristics as those measured in the nozzles of the same case. The model also confirmed that a combined Fanno-Rayleigh entropy curve was instructive in determining sonic flow conditions in each nozzle case. The results of this study demonstrate that the developed model is a feasible tool for fundamental analysis of SCEPS injectors.
- Dissertation Note:
- M.S. Pennsylvania State University, 2017.
- Technical Details:
- The full text of the dissertation is available as an Adobe Acrobat .pdf file ; Adobe Acrobat Reader required to view the file.
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