Internal chamber modeling of a solid rocket motor: Effects of coupled structural and acoustic oscillations on combustion

Montesano, John; Behdinan, Kamran; Greatrix, David R.; Fawaz, Zouheir

doi:10.1016/j.jsv.2007.08.030

Cited by 45 publications

(46 citation statements)

References 8 publications

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“…The level of sophistication required for modelling the motor structure (propellant, casing, static-test sleeve, nozzle) and applicable boundary conditions (load cell on a static test stand) can vary, depending on the particular application and motor design. Montesano et al [14] employed a finite-element approach towards the structural modeling of the given motor configuration. In the present study, a cylindrical-grain configuration allows for a simpler approach via the thick wall theory, as reported in [15].…”

Section: Numerical Modelmentioning

confidence: 99%

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

Greatrix

2015

Energies

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Abstract: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.

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Section: Numerical Modelmentioning

confidence: 99%

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

Greatrix

2015

Energies

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“…The level of sophistication required for modeling the motor structure (propellant, casing, nozzle) and applicable boundary conditions can vary, depending on the particular application and motor design. Montesano et al [4] employed a finite-element approach towards the structural modeling of the given motor configuration. In the present study, a cylindrical-grain configuration allows for a simpler approach via thick-wall theory, as reported in [5,6].…”

Section: Numerical Modelmentioning

confidence: 99%

“…Note that the roughness height value of 400 :m comes from the nominal peak AP crystal diameter used by some comparable composite-propellant experimental motors in the literature [2]. The effects of propellant and casing dynamic deflection have been considered in past combustion instability studies (see [4,6]). Here, we are interested in looking at quasi-steady outward deflection of the propellant and surrounding casing under pressure loading, and how this affects the resulting internal ballistics of the motor.…”

Section: 33mentioning

confidence: 99%

Scale Effects on Quasi-Steady Solid Rocket Internal Ballistic Behaviour

Greatrix

2010

Energies

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Abstract:The ability to predict with some accuracy a given solid rocket motor's performance before undertaking one or several costly experimental test firings is important. On the numerical prediction side, as various component models evolve, their incorporation into an overall internal ballistics simulation program allows for new motor firing simulations to take place, which in turn allows for updated comparisons to experimental firing data. In the present investigation, utilizing an updated simulation program, the focus is on quasi-steady performance analysis and scale effects (influence of motor size). The predicted effects of negative/positive erosive burning and propellant/casing deflection, as tied to motor size, on a reference cylindrical-grain motor's internal ballistics, are included in this evaluation. Propellant deflection has only a minor influence on the reference motor's internal ballistics, regardless of motor size. Erosive burning, on the other hand, is distinctly affected by motor scale.Keywords: solid rocket motor internal ballistics; scale effects; quasi-steady operation

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“…Utilizing O-rings to support the bearings flexibly, thereby producing significant viscous damping, has been known as one of the best ways to suppress these vibrations (Dousti et al 2013;Kligerman, Gottlieb, and Darlow 1998;Ertas et al 2015). The effectiveness of rubber materials for high-frequency vibrations have been widely recognized in other fields including those involving the engine mount of automobiles (Wollscheid and Lion 2013;Rendek and Lion 2010), combustion instability of solid propellant rocket motors (Montesano et al 2008), and ultrasonic testing of piping systems with a flange gasket (Cho and Rokhlin 2015). However, the nonlinear viscoelasticity of the rubber materials is not clearly understood, compared to that of structural materials like metals.…”

Section: Introductionmentioning

confidence: 99%

Calculation of high-frequency dynamic properties of squeezed O-ring for bearing support

Shoyama

Fujimoto

2018

Mechanical Engineering Journal

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Determination and prediction of the dynamic properties of an O-ring for bearing support were performed. Utilizing O-rings as supporters of bearing is a promising way to suppress severe vibrations such as resonance and self-excited whirl experienced in high-speed turbo machinery. However, analytical prediction of the dynamic properties of O-rings has not been very successful so far because of its non-linear dependence on many parameters. In this study, focusing on the incompressibility of rubber materials, the isochoric shear viscoelasticity of an O-ring material was measured for high frequencies of up to 1 kHz. In measuring the viscoelasticity, a testing method developed by the authors was used. This method enables obtaining high-frequency shear viscoelasticity directly without assuming the temperature-frequency superposition principle. The obtained dynamic shear properties were modeled as functions of the frequency and hydrostatic pressure. Finite element models of squeezed O-rings were constructed with the material model assuming uniform property distribution, and dynamic analyses were conducted. The dynamic properties of O-rings were determined from the time-series data for the applied force and displacement. The data agreed with the experimental results of an actual O-ring. It was found that the dynamic properties of rubber components can be analytically predicted by considering the frequency and hydrostatic pressure dependence on the viscoelasticity.

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Internal chamber modeling of a solid rocket motor: Effects of coupled structural and acoustic oscillations on combustion

Cited by 45 publications

References 8 publications

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

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

Scale Effects on Quasi-Steady Solid Rocket Internal Ballistic Behaviour

Calculation of high-frequency dynamic properties of squeezed O-ring for bearing support

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