Internal Ballistic Modeling of a Star-Grain Solid Rocket Motor

2003 ◽  
Author(s):  
Sonny Loncaric ◽  
David Greatrix ◽  
Zouheir Fawaz
Keyword(s):  
Rocket Motor ◽  
Solid Rocket Motor ◽  
Internal Ballistic ◽  
Solid Rocket

A Modified Discriminance in Performance Reliability Simulation of Solid Rocket Motor

2015 ◽  
Vol 798 ◽  
pp. 576-581
Author(s):  
Hao Xu ◽  
Fu Ting Bao ◽  
Chen Cheng ◽  
Bin Hang Wang
Keyword(s):  
Rocket Motor ◽  
Uncertain Parameters ◽  
Sample Analysis ◽  
Solid Rocket Motor ◽  
Ballistic Performance ◽  
Internal Ballistic ◽  
Solid Rocket ◽  
Curve Similarity ◽  
Analysis Of Performance ◽  
Monte Carlo Simulation Model

In the assessment of internal ballistic performance reliability of Solid Rocket Motor (SRM), eigenvalue discriminance method has long been used. In order to avoid the limitations of the traditional methods, a curve similarity discriminance modification combined with Hausdorff Distance was introduced. A Monte-Carlo simulation model of internal ballistic performance was established, and several uncertain parameters were chosen. A sample analysis of performance reliability of a designed SRM was presented. The result was credible, which proved the modification is feasible and it can meet the needs of the assessment of the internal ballistic performance reliability.

scholarly journals Structural vibrations and internal ballistic modelling of a star-grain solid rocket motor

2021 ◽  
Author(s):  
Sonny Loncaric
Keyword(s):  
Finite Element ◽  
Simulation Model ◽  
Numerical Solutions ◽  
Damping Ratio ◽  
Structural Response ◽  
Rocket Motor ◽  
Numerical Dissipation ◽  
Solid Rocket Motor ◽  
Internal Ballistic ◽  
Solid Rocket

A numerical model is developed to solve the governing equations for the structural dynamics and internal ballistics of a solid rocket motor (SRM). An explicit finite element method is used to solve for the structural response, and an explicit finite volume method is used to solve for the internal ballistic flow. Together, these two numerical solutions are coupled to model the nonsteady behaviour of axial combustion instability in sleeved cylindrical- and star-grain SRMs. The simulation model is used to predict the axial instability in star-grain SRMs. A parametric analysis is made to record the effects of various parameters on the simulation model. These parameters include the numerical dissipation constant, damping ratio and pulsing strength. It is found that both the numerical dissipation constant and damping ratio can, both artificially and physically, affect the finite element structural response of the motor. The pulsing strength affects only the rate at which the do pressure rises as well as how quickly the limiting wave amplitude is reached. A numerical model is developed to solve the governing equations for the structural dynamics and internal ballistics of a solid rocket motor (SRM). An explicit finite element method is used to solve for the structural response, and an explicit finite volume method is used to solve for the internal ballistic flow. Together, these two numerical solutions are coupled to model the nonsteady behaviour of axial combustion instability in sleeved cylindrical- and star-grain SRMs.The simulation model is used to predict the axial instability in star-grain SRMs. A parametric analysis is made to record the effects of various parameters on the simulation model. These parameters include the numerical dissipation constant, damping ratio and pulsing strength. It is found that both the numerical dissipation constant and damping ratio can, both artificially and physically, affect the finite element structural response of the motor. The pulsing strength affects only the rate at which the do pressure rises as well as how quickly the limiting wave amplitude is reached.The detailed analysis of simulated star-grain SRM axial instability reveals the effect of structural vibrations on burning rate augmentation and wave development in nonsteady operation. The variation in oscillation frequencies about a given grain section periphery, and along the grain with different levels of burnback, influences the means by which the local acceleration drives the combustion and flow behavior. The amount of damping also plays a role in influencing the predicted instability symptoms of the motor.

scholarly journals Structural vibrations and internal ballistic modelling of a star-grain solid rocket motor

2021 ◽  
Author(s):  
Sonny Loncaric
Keyword(s):  
Finite Element ◽  
Simulation Model ◽  
Numerical Solutions ◽  
Damping Ratio ◽  
Structural Response ◽  
Rocket Motor ◽  
Numerical Dissipation ◽  
Solid Rocket Motor ◽  
Internal Ballistic ◽  
Solid Rocket

A numerical model is developed to solve the governing equations for the structural dynamics and internal ballistics of a solid rocket motor (SRM). An explicit finite element method is used to solve for the structural response, and an explicit finite volume method is used to solve for the internal ballistic flow. Together, these two numerical solutions are coupled to model the nonsteady behaviour of axial combustion instability in sleeved cylindrical- and star-grain SRMs. The simulation model is used to predict the axial instability in star-grain SRMs. A parametric analysis is made to record the effects of various parameters on the simulation model. These parameters include the numerical dissipation constant, damping ratio and pulsing strength. It is found that both the numerical dissipation constant and damping ratio can, both artificially and physically, affect the finite element structural response of the motor. The pulsing strength affects only the rate at which the do pressure rises as well as how quickly the limiting wave amplitude is reached. A numerical model is developed to solve the governing equations for the structural dynamics and internal ballistics of a solid rocket motor (SRM). An explicit finite element method is used to solve for the structural response, and an explicit finite volume method is used to solve for the internal ballistic flow. Together, these two numerical solutions are coupled to model the nonsteady behaviour of axial combustion instability in sleeved cylindrical- and star-grain SRMs.The simulation model is used to predict the axial instability in star-grain SRMs. A parametric analysis is made to record the effects of various parameters on the simulation model. These parameters include the numerical dissipation constant, damping ratio and pulsing strength. It is found that both the numerical dissipation constant and damping ratio can, both artificially and physically, affect the finite element structural response of the motor. The pulsing strength affects only the rate at which the do pressure rises as well as how quickly the limiting wave amplitude is reached.The detailed analysis of simulated star-grain SRM axial instability reveals the effect of structural vibrations on burning rate augmentation and wave development in nonsteady operation. The variation in oscillation frequencies about a given grain section periphery, and along the grain with different levels of burnback, influences the means by which the local acceleration drives the combustion and flow behavior. The amount of damping also plays a role in influencing the predicted instability symptoms of the motor.

scholarly journals Numerical Evaluation of the Use of Aluminum Particles for Enhancing Solid Rocket Motor Combustion Stability

2021 ◽  
Author(s):  
David Greatrix
Keyword(s):  
Pressure Wave ◽  
Internal Flow ◽  
Rocket Motor ◽  
Combustion Stability ◽  
Transient Pressure ◽  
Solid Rocket Motor ◽  
Aluminum Particles ◽  
Internal Ballistic ◽  
Reactive Particles ◽  
Solid Rocket

The ability to 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 typically necessitates a comprehensive numerical model for internal ballistic simulation under dynamic flow and combustion conditions. On the mitigation side, one in practice sees the use of inert or reactive particles for the suppression of pressure wave development in the motor chamber flow. With the focus of the present study placed on reactive particles, a numerical internal ballistic model incorporating relevant elements, such as a transient, frequency-dependent combustion response to axial pressure wave activity above the burning propellant surface, is applied to the investigation of using aluminum particles within the central internal flow (particles whose surfaces nominally regress with time, as a function of current particle size, as they move downstream) as a means of suppressing instability-related symptoms in a cylindrical-grain motor. The results of this investigation reveal that the loading percentage and starting size of the aluminum particles have a significant influence on reducing the resulting transient pressure wave magnitude.

scholarly journals Numerical Evaluation of the Use of Aluminum Particles for Enhancing Solid Rocket Motor Combustion Stability

2021 ◽  
Author(s):  
David Greatrix
Keyword(s):  
Pressure Wave ◽  
Internal Flow ◽  
Rocket Motor ◽  
Combustion Stability ◽  
Transient Pressure ◽  
Solid Rocket Motor ◽  
Aluminum Particles ◽  
Internal Ballistic ◽  
Reactive Particles ◽  
Solid Rocket

The ability to 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 typically necessitates a comprehensive numerical model for internal ballistic simulation under dynamic flow and combustion conditions. On the mitigation side, one in practice sees the use of inert or reactive particles for the suppression of pressure wave development in the motor chamber flow. With the focus of the present study placed on reactive particles, a numerical internal ballistic model incorporating relevant elements, such as a transient, frequency-dependent combustion response to axial pressure wave activity above the burning propellant surface, is applied to the investigation of using aluminum particles within the central internal flow (particles whose surfaces nominally regress with time, as a function of current particle size, as they move downstream) as a means of suppressing instability-related symptoms in a cylindrical-grain motor. The results of this investigation reveal that the loading percentage and starting size of the aluminum particles have a significant influence on reducing the resulting transient pressure wave magnitude.

Solid rocket motor design using a surrogate model

2018 ◽  
Vol 90 (7) ◽  
pp. 1104-1127
Author(s):  
Ceyhun Tola ◽  
Melike Nikbay
Keyword(s):  
Structural Strength ◽  
Response Surfaces ◽  
Rocket Motor ◽  
Geometric Parameters ◽  
Solid Rocket Motor ◽  
Ballistic Performance ◽  
Content Type ◽  
Internal Ballistic ◽  
Solid Rocket ◽  
Sectional Parameters

Purpose This study aims to determine the relationship between sectional geometric parameters of a slotted solid rocket propellant on structural integrity and internal ballistic performance of a rocket motor by using response surface method. Design/methodology/approach Zero-dimensional (0D) ballistic solver is developed and validated to determine the effects of sectional geometric parameters on internal ballistic performance of a rocket motor. Additionally, effects of these parameters on structural strength of the system are examined by performing linear viscoelastic finite element analysis under plane strain assumption. Results of the 0D internal ballistic analyses are used as an input to the structural analysis. Findings Different response surfaces are constructed to represent the characteristic variation of solid propellant’s structural strength and internal ballistic performance with respect to design variables. Originality/value Coupled analysis methodology in terms of structural strength and internal ballistic performance presented in this work facilitates many designers who are working on solid rocket motor development. This study represents graphical results summarizing effects of sectional parameters of a slotted grain on both internal ballistic performance and structural strength results. Additionally, graphical results summarizing the effects of sectional parameters on structural strength and internal ballistic performance provide useful information for researchers that lessens design period. Finally, validations presented in this work can also be used as a benchmark reference for different studies.

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