Numerical Investigation on the Transient Ignition Behavior Using CFD-DEM Approach

Cheng, Cheng; Zhang, Xiaobing

doi:10.1080/00102202.2014.907796

Cited by 16 publications

(7 citation statements)

References 32 publications

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“…The heating of the flow path, the local variation of temperature within the particle, the localized fluid induced temperature changes in the diverting plate, and the localized cooling and/or heating effects due to specific particle contact with the plate cannot be captured with this level of detail using the DEM-Eulerian-based models or when using simplified solid body thermal models coupled to a CFD model. 12,[15][16][17] The contour plots presented clearly show, qualitatively, the spatial and temporal variation in the temperature and flow fields surrounding and within the particles, flow path surfaces, and the flow obstructing plate and how localized, time-dependent effects such as a specific contact or specific flow stream impingement upon surface contributes to these thermal conditions. As the particles move and impact the flow obstructing plate, the particles in the right-most column rebound from the surface, and, as a consequence, are forced to more vigorously interact with the particles that are continuing to move toward the plate, leading to contact between particles from different initial rows at different temperature levels and to changes in the particle positioning.…”

Section: Representative Results and Description Of Phenomenamentioning

confidence: 90%

“…Yang et al 14 estimate convective heat transfer from a particle surface through a correlation and use analytical methods to model contacting particles with each particle at a uniform temperature. Cheng and Zhang, 15 in a study of the combustion process of propellant grains, use a quasi-steady, semi-infinite solid approximation to determine the particle surface temperatures with a heat transfer coefficient for the convective and radiative exchange. In all of these studies, the particles are not discretized and so the temperature distributions around and within the solid bodies and the local flow over the solids are not available and the flow and particle conditions cannot be locally coupled.…”

Section: Introductionmentioning

confidence: 99%

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Direct simulation of thermally and mechanically coupled particle-laden flow

Florio

2021

SIMULATION

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This work describes a unique technique to simulate continuously and directly coupled fluid flow and moving particles including both mechanical and thermal interactions between the flow, particles, and flow paths. The particles/flow paths are discretized within a computational fluid dynamics flow domain so that the local flow and temperature field conditions surrounding each particle or other solid body are known along with the local temperature distribution within the particle and other solids. Contact conduction between solid bodies including contact resistance, conjugate heat transfer at the fluid–solid interfaces, and even radiation exchanges between solid surfaces and between solid surfaces and the fluid are incorporated in the thermal interactions and a soft collision model simulates the solid body mechanical contact. The ability to capture these local flow and thermal effects removes reliance on correlations for fluid forces and for heat transfer coefficients/exchange and removes restrictions on the flow regime and particle size and volume fraction considered. Larger particle sizes and higher particle concentration conditions can be studied with local effects captured. The method was tested for a range of particle thermal and mechanical properties, driving pressures, and for limited radiation parameters. The results reveal important information about the basic thermal and flow phenomena that cannot be obtained in standard modeling methods and demonstrate the utility of the modeling method. The technique can be applied to examine phenomena dependent on local thermal conditions such as chemical reactions, material property variation, agglomerate formation, and phase change. The methods can also be used as a basis for machine learning algorithm development for flows with large particle counts so that more detailed phenomena can be considered compared to those provided by standard techniques with reduced computational costs compared to those with fully resolved particles in the flow.

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Section: Representative Results and Description Of Phenomenamentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Direct simulation of thermally and mechanically coupled particle-laden flow

Florio

2021

SIMULATION

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“…The first approach is improving the accuracy of mathematical modeling, especially for the propellant combustion and the flow of the combustion products in gun chambers. There are mainly three aspects of improvements, which include the dimension of the models [1][2][3][4][5], the characterization of the solid phase [6][7][8], and direct models for the chemical reactions [9,10]. The second approach is utilizing high-resolution numerical methods to solve the PDEs established through the mathematical modeling.…”

Section: Introductionmentioning

confidence: 99%

A Riemann Problem Based Coupling Method for Predicting the Combustion of Propellant in a Gun Launching Process

Zhang

2019

Propellants Explo Pyrotec

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Methods for improving the accuracy and guaranteeing the fidelity of numerical predictions are of great importance for physical problems accompanied by strong nonlinear multi‐physic interactions and extreme working conditions. The prediction of propellant combustion in a gun launching process is a typical example. A one‐dimensional two‐fluid model was utilized to govern the fluid field induced by the combustion. In order to guarantee the accuracy of the predictions, we utilized a Roe's scheme to solve the partial differential equations. To guarantee the accuracy of the moving boundaries in the expanding chamber, the coupling between the updating of the fluid field and the approximation of the mechanical interactions between the projectile and the barrel is realized based on the commercial software ABAQUS. The separate treatment of the advection and source terms in the split approach was verified through the agreement between the maximum value of the predicted average pressure in a closed bomb and the theoretical value. The coupled method dealing with the moving boundaries was validated by comparing the numerical results with the analytical results of a pressure‐driven piston case. Finally, the numerical method was applied to a large‐caliber gun. The predicted maximum pressure and the muzzle velocity agree well with experiments.

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“…According to the assumption, the density of the products is uniformly distributed in the combustion chamber and the velocity is linearly distributed along the axis of the barrel. According to multidimensional and multi-phase flow models (Wildegger-Gaissmaier and Johnston, 1996; Beckstead et al , 2007; Miura et al , 2008; Sung et al , 2013; Cheng and Zhang, 2014; Qiao and Zhang, 2017; Hu and Zhang, 2018a) for the combustion, the density, velocity and pressure of the combustion products are irregularly distributed in the chamber. Due to the high-pressure environments and the nonlinear mechanical interactions in the barrel, discontinuities such as flame waves and shock waves are unavoidable phenomena.…”

Section: Introductionmentioning

confidence: 99%

A Godunov type method determining boundary conditions to predict the transient heat transfer in an expanding combustion chamber

Zhang

2019

HFF

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Purpose This paper aims to improve the reliability of numerical methods for predicting the transient heat transfers in combustion chambers heated internally by moving heat sources. Design/methodology/approach A two-phase fluid dynamic model was used to govern the non-uniformly distributed moving heat sources. A Riemann-problem-based numerical scheme was provided to update the fluid field and provide convective boundary conditions for the heat transfer. The heat conduction in the solids was investigated by using a thermo-mechanical coupled model to obtain a reliable expanding velocity of the heat sources. The coupling between the combustion and the heat transfer is realized based on user subroutines VDFLUX and VUAMP in the commercial software ABAQUS. Findings The capability of the numerical scheme in capturing discontinuities in initial conditions and source terms was validated by comparing the predicted results of commonly used verification cases with the corresponding analytical solutions. The coupled model and the numerical methods are capable of investigating heat transfer problems accompanied by extreme conditions such as transient effects, high-temperature and high-pressure working conditions. Originality/value The work provides a reliable numerical method to obtain boundary conditions for predicting the heat transfers in solids heated by expanding multiphase reactive flows.

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Numerical Investigation on the Transient Ignition Behavior Using CFD-DEM Approach

Cited by 16 publications

References 32 publications

Direct simulation of thermally and mechanically coupled particle-laden flow

Direct simulation of thermally and mechanically coupled particle-laden flow

A Riemann Problem Based Coupling Method for Predicting the Combustion of Propellant in a Gun Launching Process

A Godunov type method determining boundary conditions to predict the transient heat transfer in an expanding combustion chamber

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