Journal ArticleDOI
Effect of Diaphragms on Regression Rate in Hybrid Rocket Motors
C. Palani Kumar,Amit Kumar +1 more
TLDR
In this work, single-port, cylindrical grain laboratory-scale hybrid rocket motors are numerically simulated to study the effect of diaphragms.Abstract:
In this work, single-port, cylindrical grain laboratory-scale hybrid rocket motors are numerically simulated to study the effect of diaphragms. The effect of single and multiple diaphragms is investigated by varying diaphragm height, its axial location (for a single diaphragm), and spacing (for multiple diaphragms) at selected inlet GOX. A single diaphragm increases the local regression rate and its influence is prominent only in the region immediate downstream. Therefore, a tangible increment in average regression rate with a single diaphragm can only be realized for motors with small L/D( 10), use of multiple diaphragms are required to increase the regression rate and combustion effici...read more
Citations
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Journal ArticleDOI
Simulation of Gaseous Oxygen/Hydroxyl-Terminated Polybutadiene Hybrid Rocket Flowfields and Comparison with Experiments
TL;DR: In this paper, numerical simulations of the flowfield in a gaseous oxygen/hydroxyl-terminated polybutadiene hybrid rocket engine are carried out with a Reynolds-averaged Navier-Stokes solver including detailed gas/surface interaction modeling based on surface mass and energy balances.
Journal ArticleDOI
Hybrid Rockets with Axial Injector: Port Diameter Effect on Fuel Regression Rate
TL;DR: In this article, a numerical reconstruction of a series of test data obtained with static firings of a lab-scale hybrid rocket is carried out with a Reynolds-averaged Navier-Stokes solver including detailed gas-surface interaction modeling based on surface mass and energy balances.
Journal ArticleDOI
Effect of swirl on the regression rate in hybrid rocket motors
C. Palani Kumar,Amit Kumar +1 more
TL;DR: In this paper, the effect of swirl on regression rate (r b ) in a hybrid rocket motor is investigated numerically, and it is shown that swirl is more effective in improving the average r b for short grains (L / D 5 ) and large diameter grains.
Journal ArticleDOI
Numerical investigation on the regression rate of hybrid rocket motor with star swirl fuel grain
Shuai Zhang,Fan Hu,Weihua Zhang +2 more
TL;DR: In this article, an attempt has been made to numerically investigate the flow field characteristics and local regression rate distribution inside the hybrid rocket motor with complex star swirl grain, where a propellant combination with GOX and HTPB has been chosen.
Journal ArticleDOI
Effect of protrusion on the enhancement of regression rate
Rajiv Kumar,P. A. Ramakrishna +1 more
TL;DR: In this article, a detailed study was carried out by using two types of protrusion (a) rubber, which burns along with fuel but at different rate, hence its shape changes with burn time), and (b) graphite, which does not burns in the combustion chamber, and therefore its shape does not change with the burn time).
References
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Journal ArticleDOI
Two-equation eddy-viscosity turbulence models for engineering applications
TL;DR: In this paper, two new two-equation eddy-viscosity turbulence models are presented, which combine different elements of existing models that are considered superior to their alternatives.
Journal ArticleDOI
Turbulent boundary layer combustion in the hybrid rocket
G. Marxman,M. Gilbert +1 more
TL;DR: In this article, it has been shown that the flame height above the surface should be in the range of 10% to 20% of the boundary layer thickness, depending on operating conditions.
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 Rate Behavior of Hybrid Rocket Solid Fuels
Martin J. Chiaverini,Nadir Serin,David K. Johnson,Yeu Cherng Lu,Kenneth K. Kuo,Grant A. Risha +5 more
TL;DR: In this paper, an experimental investigation of the regression-rate characteristics of hydroxyl-terminated polybutadiene (HTPB) solid fuel burning with oxygen was conducted using a windowed, slab-geometry hybrid rocket motor.
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