Analysis of Unsteady Combustion Performance in Solid Rocket Motor with Pintle

Abstract

In this paper, unsteady characteristics of pressure in solid rocket motor were analyzed by using response of pintle actuation, pressure and thrust data from ground test. Pressure and thrust in solid rocket motor can be controlled in real time by varying nozzle throat area with pintle, installed in the valve. Unsteady characteristics of pressure can be observed in this system occurred by various reasons.Two critical reasons, error of pintle actuation and ablation of center tube, are found and effects of each reason can be analyzed individually by re-prediction of pressure with response of pintle actuation and analyzing thrust to pressure ratio.

Numerical Simulation of Chemical Propulsion Systems: Survey and Fundamental Mathematical Modeling Approach

“…In the past, since the mathematical model of SPRMs was simple and easy to develop, it was sufficient to construct a simulation model assuming a first-or second-order linear system [19,20,22,24]. However, over the past two or three decades, as the study on a variable-thrust solid-propellant rocket motor (VTSRM) using a pintle valve has been conducted, as shown in Figure 4 [ [71][72][73][74][75][76], it has become essential to develop a mathematical simulation model to solve some uncertainties in changing system parameters by the moving pintle and limited range of the pintle motion, as shown in Figure 5 [77,78]. Therefore, several institutes developed a mathematical simulation model considering the combustion chamber volume change as combusting progressed and verified by a cold gas test to design a pressure and thrust control system [77][78][79][80][81][82][83][84].…”