Evaporation and combustion of sprays

http://www.nano.kochi-tech.ac.jp/tosiyuki/PDF/rejime-Modeling_GandP_flow_inside_cyclone_separators.pdf

Modeling the gas and particle flow inside cyclone separators

The effect of cyclone inlet dimensions on the flow pattern and performance

This paper reviews the application of Computational Fluid Dynamics (CFD) for cyclone modelling on three-dimensional unstructured meshes using both the Reynolds Stress Turbulence model and Large Eddy Simulation. Results of the subsequent numerical simulations show consistent agreement compared with Laser Doppler Anemometry measurements at a series of axial stations throughout the length of a Stairmand high efficiency cyclone.

Advances in Cyclone Modelling Using Unstructured Grids

Computational fluid dynamics (CFD) and empirical modelling of the performance of a number of cyclone samplers

Axial and tangential velocity components and associated r.m.s. fluctuations have been measured in a cyclone of 1 m height and 0.2 m diameter using Laser-Doppler anemometry. The flow problem has been formulated in terms of the partial differential equations for the conservation of mass and momentum. A second order Reynolds Stress Closure has been employed to model turbulence. The agreement between measured and predicted mean and r.m.s. velocity components is satisfactory with the main features of the flow being represented.

Experimental and theoretical studies of cyclone separator aerodynamics

A mathematical model of the three-dimensional two-phase reacting flows in gas turbine combustors has been developed which takes into account the mass, momentum, and energy coupling between the phases. The fundamental equations of motion of the droplets are solved numerically in a Lagrangian frame of reference, using a finite-difference solution of the governing equations of the gas. Well-known relations are used to model the heat and mass transfer processes and the initial droplet heat-up is allowed for. The entire fuel spray is constructed using a finite number of size ranges obeying a two parameter droplet size distribution. The results are found to be in close agreement with experimental data. An important feature of this analytical technique is that it permits the rational selection or specification of fuel nozzle design.

/pdf/three-dimensional-model-of-spray-combustion-in-gas-turbine-2tu1kr5vxy.pdf

Three-Dimensional Model of Spray Combustion in Gas Turbine Combustors

A mathematical model of the three-dimensional two-phase reacting flows in gas turbine combustors has been developed which takes into account the mass, momentum and energy coupling between the phases. The fundamental equations of motion of the droplets are solved numerically in a Lagrangian frame of reference using a finite difference solution of the governing equations of the gas. Well known relations are used to model the heat and mass transfer processes and the initial droplet heat-up is allowed for. The entire fuel spray is constructed using a finite number of size ranges obeying a two parameter droplet size distribution. The technique permits the rational selection or specification of fuel nozzle design. 26 refs.

Three-dimensional model of spray combustion in gas turbine combustors

Application de la formulation Lagrangienne a la simulation numerique de la dispersion de particules lourdes dans des ecoulements turbulents de gaz a des donnees experimentales publiees relatives a des bruleurs a charbon pulverise et un courant de gaz froid charge de particules solides

Simulation of dispersion of heavy particles in confined turbulent flows

: Much work is currently being carried out in the field of mathematical modelling of the physical and chemical processes taking place within combustion equipment to enable better combustion chamber design. One aspect of this is the numerical prediction of burning droplet trajectories in a gas flow field and in this paper a general three-dimensional particle/droplet trajectory algorithm is presented and applied to fuel sprays in gas turbine combustors. Droplet evaporation and initial heating up effects are included and trajectories are calculated within a three-dimensional computer predicted gas flow field. By injecting many droplets with initial conditions representing a particular fuel nozzle a complete fuel spray can be constructed, and this is presented graphically. The results show that in some cases the three-dimensional nature of the gas flow and the behaviour of large droplets may be expected to have a significant effect on combustor performance. (Author)

Droplet Trajectories in Three-Dimensional Gas Turbine Flow Fields.

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