Vortex breakdown: a review

Evaporation and combustion of sprays

Second-moment closure: present… and future?

Ash formation and deposition in coal and biomass fired combustion systems: Progress and challenges in the field of ash particle sticking and rebound behavior

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

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

Modeling coal-fired cyclone 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

Finite difference computations were carried out in relation to isothermal expanding swirling flows in burner quarls (tiles). The turbulence was modelled both by a second order closure with the Reynolds stress tensor components being computed from their partial differential transport equations and the k −∈ model of isotropic turbulence. Two cases of vortex expansion which were measured at the IFRF were computed and analysed in detail. These cases vere chosen in order to represent different transitions in swirling flow streams which were originally in solid body rotation. Direct comparison of measured and computed flow patterns led to the conclusion that in the analysed cases the Reynolds stress model was far superior to the widely used k −∈ model. However, some further improvements of the Reynolds stress model are still required since, for example, although the position of the internal recirculation zone formed downstream of the burner quarl was predicted very well, the amount of reverse flow was underestimated in one of the analysed cases.

Computations of near field aerodynamics of swirling expanding flows

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