Cfd Analysis Of Lean Premixed Prevapourised Combustion Chamber

CATEGORY: COMBUSTION CHAMBERS
International Journal Of Advanced Research In Engineering And Technology (IJARET), Volume 4, Issue 2 March – April 2013, pp. 69-74
Cfd Analysis Of Lean Premixed Prevapourised Combustion Chamber
S.Poovannan a, Dr.G.Kalivarathan b
a Research Scholar, CMJ University, Meghalaya, Shillong.
b Principal/ PSN Institute of Technology and Science, Tirunelveli, Tamilnadu, Supervisor,
ABSTRACT
Preliminary design procedures were verified using the advanced numerical techniques of computational fluid dynamics (CFD) and finite element analysis (FEA). These techniques are used to solve the swirling flowfield inside the premixer, the reacting flowfield inside the liner, and the complex stress state in the liner walls. Although CFD and FEA indicated that the preliminary design was successful, some large discrepancies existed between the predictions.
These findings suggest the need for more complex numerical models and experimental testing to validate the preliminary design. A three-dimensional solid model of the combustor and a complete set of engineering drawings were prepared and included as part of the mechanical design. These regulations demanded the development of new designs such as water or steam injection, which lowered NOx levels considerably by reducing the flame temperature. NOx formation rates are high in conventional combustors due to the high peak local flame temperatures typical of diffusion flames. Efforts to minimize UHC emissions were followed by the elimination of visible smoke, a problem common to the diffusion (non-premixed) flames that are used in conventional combustors. Some of the fuel can pyrolyse to form fine soot particles that are visible as smoke. Pyrolysis is the thermal decomposition of fuel when heated in the absence of oxygen.
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