Modeling of nonreactive and reactive turbulent combustor flows

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1987

OSTI ID:7158752

Nikjooy, M

A numerical study of nonreactive and reactive axisymmetric combustor flows with and without swirl is presented. Closure of the Reynolds equations is achieved by three different levels of models: k-epsilon, algebraic stress, and Reynolds stress closure. Performance of two locally nonequilibrium and one equilibrium algebraic stress models is analyzed assuming four different pressure-strain models. A comparison is also made of the performance of a high and a low Reynolds number model for combustor-flow calculations using Reynolds-stress closures. Effects of diffusion and pressure-strain models on these closures are also investigated. Two different models for the scalar transport are presented. One employs the second-moment closure which solves the transport equations for the scalar fluxes, while the other solves the algebraic equations for the scalar fluxes. In addition, two cases of non-premixed and one case of premixed combustion are considered. Fast- and finite-rate chemistry models are applied to non-premixed combustion. Both models show promise for application in gas-turbine combustors. However, finite-rate-chemistry models, which are more realistic,need to be further examined to establish a suitable coupling of the heat release effects on the turbulence field and the rate constants.

• Research Organization: Arizona State Univ., Tempe (USA)
• OSTI ID: 7158752
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
421000* -- Engineering-- Combustion Systems
COMBUSTORS
FLOW STRESS
FLUID FLOW
MATHEMATICAL MODELS
REYNOLDS NUMBER
STRAINS
STRESSES
TURBULENT FLOW