scholarly journals Scale Effects on Solid Rocket Combustion Instability Behaviour

2021 ◽  
Author(s):  
David R. Greatrix
Keyword(s):  
Numerical Model ◽  
Pressure Wave ◽  
Scale Effects ◽  
Combustion Instability ◽  
Pressure Rise ◽  
Transient Pressure ◽  
Solid Propellant Rocket ◽  
Burning Propellant ◽  
Solid Rocket ◽  
Propellant Rocket

The ability to understand and predict the expected internal behaviour of a given solid-propellant rocket motor under transient conditions is important. Research towards predicting and quantifying undesirable transient axial combustion instability symptoms necessitates a comprehensive numerical model for internal ballistic simulation under dynamic flow and combustion conditions. A numerical model incorporating pertinent elements, such as a representative transient, frequency-dependent combustion response to pressure wave activity above the burning propellant surface, is applied to the investigation of scale effects (motor size, i.e., grain length and internal port diameter) on influencing instability-related behaviour in a cylindrical-grain motor. The results of this investigation reveal that the motor’s size has a significant influence on transient pressure wave magnitude and structure, and on the appearance and magnitude of an associated base pressure rise.

scholarly journals Scale Effects on Solid Rocket Combustion Instability Behaviour

2021 ◽  
Author(s):  
David R. Greatrix
Keyword(s):  
Numerical Model ◽  
Pressure Wave ◽  
Scale Effects ◽  
Combustion Instability ◽  
Pressure Rise ◽  
Transient Pressure ◽  
Solid Propellant Rocket ◽  
Burning Propellant ◽  
Solid Rocket ◽  
Propellant Rocket

The ability to understand and predict the expected internal behaviour of a given solid-propellant rocket motor under transient conditions is important. Research towards predicting and quantifying undesirable transient axial combustion instability symptoms necessitates a comprehensive numerical model for internal ballistic simulation under dynamic flow and combustion conditions. A numerical model incorporating pertinent elements, such as a representative transient, frequency-dependent combustion response to pressure wave activity above the burning propellant surface, is applied to the investigation of scale effects (motor size, i.e., grain length and internal port diameter) on influencing instability-related behaviour in a cylindrical-grain motor. The results of this investigation reveal that the motor’s size has a significant influence on transient pressure wave magnitude and structure, and on the appearance and magnitude of an associated base pressure rise.

scholarly journals Effect of the fluid–structure interaction on solid rocket motors instabilities

2012 ◽  
Author(s):  
J. Richard ◽  
T. Morel ◽  
F. Nicoud
Keyword(s):  
Solid Propellant ◽  
Gas Flow ◽  
Solid Rocket Motors ◽  
Rocket Motors ◽  
Firing Test ◽  
Solid Propellant Rocket ◽  
Acoustic Instabilities ◽  
Solid Rocket ◽  
Coupling Algorithm ◽  
Propellant Rocket

Large solid propellant rocket motors may be subjected to aero-acoustic instabilities arising from a coupling between the burnt gas flow and the acoustic eigenmodes of the combustion chamber. Given the size and cost of any single firing test or launch, it is of first importance to predict and avoid these instabilities at the design level. The main purpose of this paper is to build a numerical tool in order to evaluate how the coupling of the fluid flow and the whole structure of the motor influences the amplitude of the aeroacoustic oscillations living inside of the rocket. A particular attention was paid to the coupling algorithm between the fluid and the solid solvers in order to ensure the best energy conservation through the interface. A computation of a subscaled version of the Ariane 5 solid propellant engine is presented as illustration.

Study of Initial Pressure Rise in Multi Grain Solid Propellant Rocket Motor

2020 ◽  
Vol 45 (5) ◽  
pp. 741-750 ◽  
Author(s):  
Balesh Ropia ◽  
Himanshu K. Shekhar ◽  
Dinesh G. Thakur
Keyword(s):  
Solid Propellant ◽  
Pressure Rise ◽  
Initial Pressure ◽  
Rocket Motor ◽  
Solid Propellant Rocket ◽  
Propellant Rocket

scholarly journals Effects Of Grain Geometry And Vibration On The Suppression Of Combustion Instability In A Solid Rocket Motor

2021 ◽  
Author(s):  
Christopher Baczynski
Keyword(s):  
Pressure Wave ◽  
Combustion Instability ◽  
Combustion Process ◽  
Rocket Motor ◽  
Structural Vibration ◽  
Solid Rocket Motor ◽  
Aspect Ratios ◽  
Port Area ◽  
Solid Rocket ◽  
The Given

A comprehensive numerical model for internal ballistic simulation under dynamic flow, combustion and structural vibration conditions is used to investigate the effectiveness of grain port area transitions of a reference solid rocket motor as a means for suppression of axial combustion instability symptoms. Modification of the propellant grain geometry is one of several traditional means for suppressing symptoms in actual motors. With respect to these symptoms, individual transient simulation runs show the evolution of the axial pressure wave and associated DC shift for the given grain geometry, as initiated by a given pressure disturbance. Limit pressure wave magnitudes are collected for a number of simulation runs for different grain area transition positions, steepness and aspect ratios, and mapped on an attenuation trend chart. Effects of acceleration, through structural vibration of the propellant surface, on the combustion process are investigated, and their influence on the effectiveness of grain area transitions is examined. With or without acceleration/vibrations effects included, the numerical results produced in this study confirm the significant ability of a grain area transition to suppress combustion instability symptoms.

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