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The performance optimization of a reverse flow combustor in a mini-jet engine is studied numerically. Different turbulence models (with appropriate mesh resolutions), i.e. steady (RANS) and unsteady k-ε (URANS) and the Reynolds stress model is adopted to investigate and compare the performance of the combustor. The probability density function (PDF) model is used to include combustion to complete...
In a nuclear power reactor fuel integrity must be ensured for its safe and smooth operation by minimizing the fuel rod damages. One of the main recognized reasons of fuel failure is due to interaction of metallic debris with fuel rods. On average one damaged fuel rod is found per reactor per cycle. The debris present in coolant is entrapped in the spacer grid and produces debris fretting which ultimately...
This paper investigates the effect of inclined angle of fuel jet on concentration of NOx emission in high temperature air combustion furnace. Computational Fluid Dynamics (CFD) modeling was implemented to investigate the combustion process and NOx formation in the furnace. The CFD model presented in this paper is validated by comparing the modeling results with measured data. The results show that...
In this paper, an alternative multi-stage self-preheating burner is presented and initial analyzed through Computational Fluid Dynamics (CFD). The chief advantages of the present design are to create a high temperature inlet air without using other auxiliary heating devices and a high speed jet in the furnace. Details of the flow field, flow velocity, temperature are provided and flue gas recirculation...
Liquefied Natural Gas (LNG) is being developed as a transportation fuel for transit buses, to lessen the dependency on oil and to reduce greenhouse gas emissions. But LNG is hazardous because of its temperature, the possibility of asphyxiation and of course the fire risk. This paper describes the use of Fluent, a widely-used commercial CFD code, to simulate the dynamics of spills from LNG bus fuel...
Challenge Project C4C is dedicated to developing and applying high-performance computing capabilities to accelerate the development of hypergolic and hybrid rocket engine concepts. Computational fluid dynamics is employed to model chemically-reacting flows within engine combustion chambers, and computational chemistry is employed to characterize propellant physical and reactive properties. Accomplishments...
An evaluation of the Computational Fluid Dynamics (CFD) sub-models for in-cylinder diesel engine combustion and emission simulations was conducted using an integrated numerical model from commercial CFD software FLUENT 6.3.26. As these simulations are sensitive to user-defined empirical parameters, the main aim of this investigation is to obtain an adjusted set of model parameters in order to achieve...
This piece of work seeks to address issues related to combustion of diesel fuel in light-duty engines, with an emphasis on bridging detailed chemical kinetics mechanism and Computational Fluid Dynamics (CFD). Numerical computation was undertaken by means of integrating CHEMKIN and FLUENT software. The computational effort was focused onto the Laminar Finite Rate model, incorporating a surrogate diesel...
Challenge Project C2N is dedicated to developing and applying high performance computing capabilities to accelerate the development of hypergolic and hybrid rocket engine concepts. Computational fluid dynamics is employed to model chemically reacting flows within engine combustion chambers and computational chemistry is employed to characterize propellant physical and reactive properties. Accomplishments...
To calculate turbulent movement and combustion in internal combustion (IC) engines the three dimensional software (KIVA-3V code) is analyzed. Computational fluid dynamics (CFD) has become an established tool for the design and understanding of practical combustion systems. Multidimensional models have proven their value in reducing the need for physical experimentation, the benefit of which has been...
The objective of this study is to develop a 3D DMFC model for modeling gas evolution and flow patterns to design optimal flow field for gas management. The gas management on the anode side is important issues in DMFC design and they greatly influence the performance of the fuel cell. The flow field is tightly related to gas management and distribution. Since experiment for the optimal design of various...
During the second year of this challenge effort, combustion simulations were employed to provide significant insight into the relative impact of flow distortion arising in the different inlet designs: rectangular, scoop and "jaws". Efforts on the rectangular cross-section design extended previous analyses to explore multi-cavity injection with streamwise and spanwise interlacing. To this...
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