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Energies 2015, 8(9), 10058-10081; doi:10.3390/en80910058

Study on Thermal Degradation Characteristics and Regression Rate Measurement of Paraffin-Based Fuel

1
Science and Technology on Combustion Internal Flow and Thermal-Structure Laboratory, Northwestern Polytechnical University Xi'an, Xi'an 710072, China
2
School of Foreign Languages, Shaanxi Normal University, Xi'an 710062, China
*
Author to whom correspondence should be addressed.
Academic Editor: Chang Sik Lee
Received: 7 November 2014 / Revised: 20 June 2015 / Accepted: 8 July 2015 / Published: 15 September 2015

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. View Full-Text
Keywords: paraffin fuel; energy characteristics; hybrid rocket; regression rate paraffin fuel; energy characteristics; hybrid rocket; regression rate
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Hu, S.; Wu, G.; Hua, Y.; Rashid, N.F.; Hu, H. Study on Thermal Degradation Characteristics and Regression Rate Measurement of Paraffin-Based Fuel. Energies 2015, 8, 10058-10081.

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