In this work, the effect of swirl on regression rate (rb) in a hybrid rocket motor is investigated numerically. The rb increased monotonically with inlet swirl number and was also found to depend on the inlet swirl profile. The swirl velocity profiles with the peak closer to the axis yielded higher rb. Parametric study on fuel grains of various lengths and diameters (L/D≤25) shows that swirl is more effective in improving the average rb for short grains (L/D&lt;5) and large diameter grains. © 2013 Elsevier Masson SAS. All rights reserved.

Amit Kumar

Department of Aerospace Engineering

EFFECT OF SWIRLS

HYBRID ROCKET MOTORS

HYBRID ROCKETS

LARGE DIAMETER

Parametric study

REGRESSION RATE

SWIRL FLOW

SWIRL VELOCITIES

Computer simulation

Rocket engines

Rockets

Regression analysis

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Aerospace Science and Technology

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. Asingle 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(&lt; 10). The combustion efficiency in the presence of a single diaphragm may increase or decrease relative to the case with no diaphragm depending on the height and the position of the diaphragm. A diaphragm positioned near the nozzle end of the motor is most effective in increasing combustion efficiency. For long motors (L/D &gt; 10), use of multiple diaphragms are required to increase the regression rate and combustion efficiency. This requires diaphragms to be strategically spaced. Simulations show that regression rate and combustion efficiency improvements are maximum when diaphragms are spaced 8-10 times their height. The results also show that, at optimal spacing, a few tall diaphragms are more effective in improving regression rate compared with many short diaphragms. Copyright © 2012 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

Journal of Propulsion and Power

Effect of diaphragms on regression rate in hybrid rocket motors

Energy & Fuels

Multiphysics Simulations of Entrained Flow Gasification. Part I: Validating the Nonreacting Flow Solver and the Particle Turbulent Dispersion Model

Acta Astronautica

Numerical simulation of HTPB combustion in a 2D hybrid slab combustor

Pediatrics in Review

Separation Anxiety Disorder and School Refusal in Children and Adolescents

Combustion, Explosion, and Shock Waves

Flow Structure and Heat and Mass Transfer in Boundary Layers with Injection of Chemically Reacting Substances (Review)

Effect of swirl on the regression rate in hybrid rocket motors

Journal	Aerospace Science and Technology
ISSN	12709638
Open Access	No