Journal ArticleDOI
Fuel Regression Rate in Hydroxyl-Terminated-Polybutadiene/ Gaseous-Oxygen Hybrid Rocket Motors
TLDR
The results of a systematic experimental investigation on the methods of enhancing the regression rate in hydroxyl-terminated polybutadiene (HTPB) fuel used in an HTPB/gaseous oxygen hybrid motor are presented in this paper.Abstract:
The results of a systematic experimental investigation on the methods of enhancing the regression rate in hydroxyl-terminated polybutadiene (HTPB) fuel used in an HTPB/gaseous oxygen hybrid motor are presented The effects of the addition of ammonium perchlorate (AP) or aluminum in the fuel, the variation of oxidizer ‐fuel ratio, and the variation of characteristic dimensions of fuel grain are presented For the extents of the parametric variations considered, while the addition of AP and/or Al and the reduction of grain port diameter enhance the regression rate, the effect due to the latter is the most signie cant one Furthermore, the regression rate increases along theaxis, and it becomes essentially constant in the port region corresponding to a fuel-rich composition The possible physical processes for all of these behaviors are discussed The experimentally obtained exponents of the variables for regression rate (oxidizer mass e ux and port diameter ) are found to be signie cantly different from those of the conventional theory The similarity between the fuel regression rate equation used in solid-fuel ramjet and that obtained in hybrid motor is discussedread more
Citations
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Proceedings ArticleDOI
Hybrid Rocket Fuel Regression Rate Data and Modeling
Gregory Zilliac,M. Karabeyoglu +1 more
TL;DR: In this paper, a regression rate model was developed based on the results of several previous studies, which is applicable to vaporizing fuels in a cylindrical grain configuration that do not form significant char or melt layers.
Journal ArticleDOI
Influence of a Conical Axial Injector on Hybrid Rocket Performance
Carmine Carmicino,A. Russo Sorge +1 more
TL;DR: In this paper, the axial-symmetric polyethylene cylindrical grains through two different injector configurations: an axial conical subsonic nozzle and a radial injector.
Journal ArticleDOI
Approaches to Low Fuel Regression Rate in Hybrid Rocket Engines
TL;DR: In this article, two approaches (multiport grain and high mixture ratio) are presented to improve the low fuel regression rate of hybrid rocket engines, which aim at reducing negative effects without enhancing regression rate.
Proceedings ArticleDOI
Performance comparison of HTPB-based solid fuels containing nano-sized energetic powder in a cylindrical hybrid rocket motor
Proceedings ArticleDOI
Scale-up tests of high regression rate liquefying hybrid rocket fuels
TL;DR: In this article, a class of paraffin-based fuels that burn at surface regression rates that are 3 to 4 times that of conventional hybrid fuels is identified and a series of scale-up tests with gaseous oxygen have been carried out using a new Hybrid Combustion Facility (HCF) at NASA Ames Research Center.
References
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Computer Program for Calculation of Complex Chemical Equilibrium Compositions and Applications II. Users Manual and Program Description. 2; Users Manual and Program Description
Bonnie J. McBride,Sanford Gordon +1 more
Computer Program for Calculation of Complex Chemical Equilibrium Compositions, Rocket Performance, Incident and Reflected Shocks, and Chapman-Jouguet Detonations
Sanford Gordon,Bonnie J. McBride +1 more
TL;DR: Computer program is described for numerical solution of chemical equilibria in complex systems by using nonlinear algebraic equations using free-energy minimization technique.
Computer program for calculation of complex chemical equilibrium compositions
Sanford Gordon,Bonnie J. McBride +1 more
TL;DR: In this article, a computer program is described for numerical solution of chemical equilibria in complex systems by using nonlinear algebraic equations and free-energy minimization technique is used.
Book ChapterDOI
Fundamentals of Hybrid Boundary-Layer Combustion
TL;DR: In this article, a regression rate equation for hybrid motors in which convective heat transfer to the grain is the rate-limiting mechanism is developed for the flat-plate flow and the theoretically predicted flame position and regression rate for a flatplate flow are compared with measurements from a Plexiglas-oxygen slab burner.
Journal ArticleDOI
Regression rates of nonmetalized hybrid fuel systems
C. F. Price,L. D. Smoot +1 more
TL;DR: In this article, a laboratory-scale slab burner has been used to characterize the regression rate of three different binder compounds with oxidizers varied from 100% fluorine to 100% oxygen.