Modelling three-dimensional gas-turbine-combustor model flow using second-moment closure

Conference · Fri Jan 01 04:00:00 EST 1993

OSTI ID:5997784

Lin, C A; Lu, C M ^[1]

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1. National Tsing Hua Univ., Hsinchu (Taiwan, Province of China)

Numerical predictions were applied to a gas-turbine combustor model flow where dilutions jets were injected radially inwards into a swirling flow, leading to a very strong interaction between the two streams. Effects of different inlet swirl level to the interior flow field were investigated numerically and the predicted mean and turbulence results were also contrasted with measurements. The present study demonstrates that the characteristics of the combustor flow are closely linked to the representation of the interaction between the swirl field and the jets. Diffusive transport was found to be highly influential, and this also increases the importance of turbulence representation. Comparisons with experimental measurements indicated that the stress model with an anisotropy modified e-source combined with quadratic approximation of convection fluxes represents the flow field reasonably well, in contrast to the k-epsilon model whose diffusive nature leads to an intense vortex core near the centerline region. Reduction of strength of the centerline recirculation zone due to the elevated level of swirl momentum transport from the swirler, was also well reproduced by the stress model variant. 15 refs.

• OSTI ID: 5997784
• Report Number(s): AIAA-Paper--93-3104; CONF-930714--; CNN: NSC-81-0401-E007-537
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330103* -- Internal Combustion Engines-- Turbine
42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
COMBUSTION CHAMBERS
COMPUTERIZED SIMULATION
ENGINES
FLUID FLOW
GAS TURBINE ENGINES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
SIMULATION
THREE-DIMENSIONAL CALCULATIONS
TURBULENT FLOW