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Cold flow analysis of trapped vortex combustor using two equation turbulence models

Published online by Cambridge University Press:  03 February 2016

P. Selvaganesh  and
S. Vengadesan
P. Selvaganesh
Affiliation:
Department of Applied Mechanics, Indian Institute of Technology Madras, Chennai, India
S. Vengadesan
Affiliation:
Department of Applied Mechanics, Indian Institute of Technology Madras, Chennai, India
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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 conventional 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-ω and modified k-ω 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-ω model closely matches with that obtained by DNS in the case of forebody-spindle alone. Non-linear k-ω 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.

Type
Research Article
Information
The Aeronautical Journal , Volume 112 , Issue 1136 , October 2008 , pp. 569 - 580
Copyright
Copyright © Royal Aeronautical Society 2008 

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References

1. Bredberg, J., Peng, S.H. and Davidson, L., An improved k-ω turbulence model applied to recirculating flows, Int J Heat and Fluid Flow, 2002, 23, pp 731–743.Google Scholar
2. Hsu, K.Y., Goss, L.P. and Roquemore, W.M., Characteristics of a trapped vortex combustor, J Propulsion and Power, 1998, 14, (1), pp 57–65.Google Scholar
3. Katta, V.R. and Roquemore, W.M. Numerical studies on trapped vortex concepts for stable combustion, J Eng for Gas Turbines and Power, 1998, 120, pp 61–68, Trans ASME.Google Scholar
4. Katta, V.R. and Roquemore, W.M., Study on trapped vortex combustor – Effect of injection on flow dynamics, J Propulsion and Power, 1998, 14, (3), pp 273–281.Google Scholar
5. Le, H., Moin, P. and Kim, J., Direct numerical simulation of turbulent flow over a backward facing step. J Fluid Mechanics, 1997, 330, pp 349–375.Google Scholar
6. Little, B.H. and Whipkey, R.R., Locked-Vortex afterbodies, J Aircr, 1979, 16, pp 296–302.Google Scholar
7. Pope, S., Turbulent Flows, 2000, Cambridge University Press.Google Scholar
8. Song, B. and Amano, R.S., Application of non-linear k-ω model to a turbulent flow inside a sharp U-bend, Computational Mechanics, 2000, 26, pp 344–351.Google Scholar
9. Stone, C. and Menon, S., Simulation of fuel-air mixing and combustion in a trapped vortex combustor, 2000, AIAA paper 2000-0478.Google Scholar
10. Wilcox, D.C., Turbulence Modeling for CFD, 2006, Third edition, DCW Industries.Google Scholar