Abstract
Paraffin fuel has been found to have a regression rate that is higher than conventional HTPB (hydroxyl-terminated polybutadiene) fuel and, thus, presents itself as an ideal energy source for a hybrid rocket engine. The energy characteristics of paraffin-based fuel and HTPB fuel have been calculated by the method of minimum free energy. The thermal degradation characteristics were measured for paraffin, pretreated paraffin, HTPB and paraffin-based fuel in different working conditions by the using differential scanning calorimetry (DSC) and a thermogravimetric analyzer (TGA). The regression rates of paraffin-based fuel and HTPB fuel were tested by a rectangular solid-gas hybrid engine. The research findings showed that: the specific impulse of paraffin-based fuel is almost the same as that of HTPB fuel; the decomposition temperature of pretreated paraffin is higher than that of the unprocessed paraffin, but lower than that of HTPB; with the increase of paraffin, the initial reaction exothermic peak of paraffin-based fuel is reached in advance, and the initial reaction heat release also increases; the regression rate of paraffin-based fuel is higher than the common HTPB fuel under the same conditions; with the increase of oxidizer mass flow rate, the regression rate of solid fuel increases accordingly for the same fuel formulation.
Highlights
With the development of national defense technology, space launch and manned space activities, the future direction for development in aircraft motor systems will focus mainly on good control, lower cost, higher safety, reliability and reusability, no pollution to the environment, etc
The energy characteristics of the additives in HTPB fuel were analyzed by Junfeng Wu [4], and the analysis showed that AP and B
The thermal degradation characteristics of HTPB/MA were analyzed by the methods of TG-DTG and differential scanning calorimetry (DSC) by Genwang Mao [6], and the results showed that the weightlessness rate of propellant increased when the HTPB contents decreased and the MA content increased; the increase of pressure would advance the low temperature decomposition peak and postpone the high temperature decomposition peak of AP, and the heat release of propellant would increase
Summary
With the development of national defense technology, space launch and manned space activities, the future direction for development in aircraft motor systems will focus mainly on good control, lower cost, higher safety, reliability and reusability, no pollution to the environment, etc. The research mainly focuses on the calculation of the energy characteristics of different paraffin-based fuel and HTPB fuel formulations, the study of the thermal degradation characteristics of pretreated paraffin, paraffin, HTPB and paraffin-based fuel, the testing of the regression rate of paraffin-based fuel in a hybrid engine by the method of a rectangular solid-gas hybrid engine with end-face combustion, the analysis of the effects of different pressure and different heating rates on the regression rate of the fuel, the computation of the chemical kinetics parameters of pretreated paraffin and paraffin-based fuel in an oxygen atmosphere and the study of the relationship among fuel formula, oxidizer mass flow rate and the regression rate
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