scholarly journals COLD FLOW ANALYSIS IN AN ANNULAR GAS TURBINE COMBUSTOR USING CFD TOOL

2015 ◽  
Vol 2 (04) ◽  
Keyword(s):  
Gas Turbine ◽  
Flow Analysis ◽  
Gas Turbine Combustor ◽  
Cold Flow ◽  
Annular Gas Turbine Combustor

Gas Turbine Combustor: Modelling and Optimization

2005 ◽  
Author(s):  
V. Ganesan ◽  
V. Jyothish Kumar
Keyword(s):  
Gas Turbine ◽  
Three Dimensional ◽  
Field Analysis ◽  
Gas Turbine Combustor ◽  
Cold Flow ◽  
Flow Losses ◽  
Flow Through ◽  
Flow Field Analysis ◽  
Probability Density Function Pdf ◽  
Modelling And Optimization

Present work is concerned with the flow field analysis inside an annular gas turbine combustor both under non-reacting and reacting conditions. Three-dimensional gas turbine combustor of 20-degree sector has been modeled using the pre-processor GAMBIT. Flow through the combustor has been simulated using FLUENT code by solving the appropriate governing equations viz., conservation of mass, momentum and energy. RNG κ-ε turbulence model is used for physical modeling. Initially prediffuser optimization has been carried out with respect to angle, length and contours. Flow through holes is modeled using porous jump boundary condition as well as modeling real holes themselves to study the efficacy of real hole modeling. Total pressure loss has been calculated to evaluate the cold flow as well as hot flow losses. Combustion has been modeled using the Probability Density Function (PDF) approach. Temperature and species concentrations are predicted.

Lean Blow-out Studies in a Swirl Stabilized Annular Gas Turbine Combustor

2015 ◽  
Vol 32 (2) ◽  
Author(s):  
R. K. Mishra ◽  
S. Kishore Kumar ◽  
Sunil Chandel
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Gas Turbine ◽  
Cfd Analysis ◽  
Gas Turbine Combustor ◽  
Tetrahedral Meshes ◽  
Annular Combustor ◽  
Unstructured Tetrahedral Meshes ◽  
Annular Gas Turbine Combustor

AbstractLean blow out characteristics in a swirl stabilized aero gas turbine combustor have been studied using computational fluid dynamics. For CFD analysis, a 22.5° sector of an annular combustor is modeled using unstructured tetrahedral meshes comprising 1.2 × 10

scholarly journals CFD Indications of Premix Flame Stability in a Gas Turbine Combustor

1996 ◽  
Author(s):  
J. Allan
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Gas Turbine ◽  
Heating Rate ◽  
Flame Stability ◽  
Cfd Model ◽  
Gas Turbine Combustor ◽  
Flow Models ◽  
Cold Flow ◽  
Primary Zone

An approach for predicting the relative tendency for weak extinction among similar gas turbine premix combustors is presented. The method involves analyzing CFD (computational fluid dynamics) solutions so as to evaluate the recirculating masses in the primary zone and the resulting potential heating rate of incoming fresh mixture. Results are illustrated for two combustor geometries which look similar but have very different behaviour. The comparison between the combustors agrees with test data when the CFD model incorporates a simulation of the flame. The inadequacy of cold flow models for the purpose is shown.

Experimental Investigations on Isothermal Swirling Flows in a Reverse Flow Annular Gas Turbine Combustor

2005 ◽  
Author(s):  
K. Sudhakar Reddy ◽  
D. N. Reddy ◽  
C. M. Vara Prasad
Keyword(s):  
Reynolds Number ◽  
Combustion Chamber ◽  
Gas Turbine ◽  
Reverse Flow ◽  
Swirling Flows ◽  
Recirculation Region ◽  
Gas Turbine Combustor ◽  
Swirl Number ◽  
Inlet Swirl ◽  
Annular Gas Turbine Combustor

An experimental work was carried out on confined swirling flows under non-combusting conditions in a reverse flow annular gas turbine combustor. Flow measurements with a five hole pitot probe are carried out in a flow apparatus of a geometrical configuration similar to the model of a swirl combustor. Mean flow results are obtained for different flow conditions to determine the effect of swirl on the recirculation zone and the variation of the swirl strength along the axis of the gas turbine combustion chamber. The boundaries of the recirculation region are plotted to compare the size and length of the zone with various swirlers. Minimum flow Reynolds number is required for flow recirculation; the effect of Reynolds number on determining which flow class is present for flow of interest in combustion chamber was investigated. The inlet swirl number is optimized for higher swirl strength and the inlet swirl number for which recirculation completely vanishes is also estimated.

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