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1-D Transient Thermal Analysis by Finite Difference Methods (Unsteady Heat Transfer)

Author(s):

Khizeruddin Mohd , Sreenidhi institute of science and technology (JNTUH), Hyderabad, India

Keywords:

Retro Rocket Motor, 1-D Transient Thermal, Heat Transfer

Abstract

Retro rocket motor is used for stage separation of missiles and rockets. The retro motor hardware design generally carried out with metals. Retro motors are widely used to generate reverse thrust to impart a desired stabilized forced to separate spent and ongoing stages. The working principle of Retro motor is mainly Newton’s 2nd and 3rd laws. Retro motors are non-air breathing propulsion class i.e., then don’t require oxygen from the atmosphere for combustion of the fuel which is stored in the retro motor. Hot gases are generated during the firing of retro motor. The hot gases are at a temperature of ⁓2000K. The thermal analysis has been carried out to study the effect of hot gases on the retro rocket motor case. Transient thermal analysis has been carried out to predict the temperature distribution across the casing thickness for the retro rocket motor for an operating duration of 1.5 seconds. Transient heat conduction analysis based on the finite difference method is used applying the known boundary conditions. The motor casing experiences convective heat transfer due to the turbulent flow of the gases. The outer surface of the retro motor is assumed to be insulated for a conservative design. The temperature on the motor casing have been predicted using transient thermal analysis. Finite difference method was employed to study the temperature variation across the motor casing thickness. Based on the stability criteria, time intervals were calculated for Fo=0.5, 0.4, 0.3 and solved to determine the temperature variation across motor casing. Comparison of implicit and explicit-finite difference method, depending upon the stability criteria of Fourier number limitation- increment and decrement of time and spatial intervals is carried out.

Other Details

Paper ID: IJSRDV7I40133
Published in: Volume : 7, Issue : 4
Publication Date: 01/07/2019
Page(s): 260-263

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