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- W2106257151 abstract "A series of combustion tests were designed with a PMMA/GOX combination in order to study the effect of resonance between acoustic perturbations due to a vortex shedding and an unsteady heat release on the non-linear combustion in a hybrid rocket. Test results showed that the pressure traces with disk 4 only showed a peculiar discontinuity with a pressure drop of about 10 psi during the nominal combustion. The pressure exhibited a sudden drop known as a negative DC-shift reported in the literature. The mechanism of negative DC-shift is not fully understood yet. However, it is conjectured the induced oscillation generated by disk 4 in the pre-chamber may be out of phase and thus suppress the amplification of oscillations formed by vortex shedding in the post chamber. Also, an accompanying LES was performed for a duct flow with wall blowing instead of a channel configuration to account for more realistic geometrical configuration of fuel grain including curvature effects and compressibility. LES analysis for a duct flow with wall blowing could simulate vey similar flow behaviors observed in the analysis of a channel flow. These include the formation of roller-like vortices, vortices broken into pieces from the coherent streaky structure, and the existence of periodic oscillatory flow having an instantaneous negative velocity. The excursion to negative velocity can be responsible to oscillate temperature profile near the wall surface. Even though the role of negative velocity profile and oscillatory surface flow is not fully understood yet, it should be further investigated for a future study." @default.
- W2106257151 created "2016-06-24" @default.
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- W2106257151 date "2010-07-11" @default.
- W2106257151 modified "2023-09-22" @default.
- W2106257151 title "Non-linear Combustion and LES Analysis with Wall Blowing in Hybrid Rocket" @default.
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- W2106257151 doi "https://doi.org/10.2514/6.2010-6956" @default.
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