Journal ArticleDOI
Cold flow analysis of trapped vortex combustor using two equation turbulence models
P. Selvaganesh,S. Vengadesan +1 more
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In this article, numerical investigation of cold flow (non-reacting) through trapped vortex combustor is performed, which involves passive flow through TVC to obtain an optimum cavity size to trap stable vortices inside the cavity and to observe the important characteristics of TVC.Abstract:
A new combustor concept referred as the trapped vortex combustor (TVC) employs a vortex that is trapped inside a cavity to stabilise the flame. The cavity is formed between two axisymmetric disks mounted in tandem. TVC offers many advantages when compared to conven- tional swirl stabilisers. In the present work, numerical investigation of cold flow (non-reacting) through trapped vortex combustor is performed. The numerical simulation involves passive flow through TVC to obtain an optimum cavity size to trap stable vortices inside the cavity and to observe the important characteristics of TVC. One of the main objectives is to evaluate various two equation turbulence models for the aerodynamic predictions of TVC. Commercial CFD software Fluent is used for the present study. In addition to many models available, Non-linear k-� and modified k-� models are incorporated through user defined functions. Results obtained include streamlines, residence time and entrainments for all models. The reattachment length obtained by non-linear k-� model closely matches with that obtained by DNS in the case of forebody-spindle alone. Non-linear k-� model alone captures the corner vortices while all the other models failed to capture. From the entrainment characteristics study, it is inferred that the primary air needs to be injected for accommodating the decrease in oxidizer inside the cavity to obtain better performance from the TVC.read more
Citations
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Journal ArticleDOI
The unsteady turbulence flow of cold and combustion case in different trapped vortex combustor
TL;DR: In this paper, a new structure with guide vane and blunt body is proposed to improve combustion efficiency of trapped vortex combustor, and the results show that the setting of blunt body can increase the value and the distribution area of turbulent kinetic energy, and improve the heat and mass transfer of the combustion chamber.
Journal ArticleDOI
Characteristics study on a modified advanced vortex combustor
TL;DR: In this article, a modified advanced vortex combustor is proposed to overcome the incomplete combustion of fuel, which is characterized by a variable cross-section with a bevel and guide vanes.
Journal ArticleDOI
Enhanced vortex stability in trapped vortex combustor
S. Vengadesan,C. Sony +1 more
TL;DR: In this paper, a numerical investigation of cold flow through the two-cavity trapped vortex combustor is performed, where passive flow is assumed to be achieved by circulation and the vortex is trapped inside when a second afterbody is added.
Journal ArticleDOI
A review of computational studies on trapped vortex combustors for gas turbine applications
TL;DR: In this paper , a review of the progress in the development of trapped vortex combustors (TVC) in the past three decades is presented, which aims to identify the needs, predict the scope and discuss the challenges of numerical simulations in TVC applied to gas turbines.
References
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Turbulence modeling for CFD
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Journal ArticleDOI
Direct numerical simulation of turbulent flow over a backward-facing step
Hung Le,Parviz Moin,John Kim +2 more
TL;DR: In this paper, a simulation of the Navier-Stokes equations of a backward-facing step flow was performed at a Reynolds number of 5100 based on the step height h and inlet free-stream velocity.
Journal ArticleDOI
Characteristics of a Trapped-Vortex Combustor
TL;DR: In this article, the characteristics of a trapped-vortex (TV) combustor are described and the instantaneous shape of the recirculation zone of the trapped vortex is measured using a two-color PIV technique.
Journal ArticleDOI
Study on Trapped-Vortex Combustor-Effect of Injection on Flow Dynamics
TL;DR: In this paper, the authors employed a numerical simulation to investigate the vortex dynamics of a cavity into which fuel and air are directly injected through jets, and found that mass injection increases the optimum size of the cavity.
Journal ArticleDOI
An improved k−ω turbulence model applied to recirculating flows
TL;DR: In this paper, an improved k−ω turbulence model is proposed, which brings the asymptotic boundary value for ω into accord with direct numerical simulation (DNS) data.