Comparison of Two-Dimensional Models for Predicting Turbulent Combustion in Inert Porous Media

2008 ◽  
Author(s):  
Marcelo J. S. de Lemos
Keyword(s):  
Heat Transfer ◽  
Porous Media ◽  
Turbulent Combustion ◽  
Two Dimensional ◽  
Flow Rates ◽  
Simple Closure ◽  
Preliminary Testing ◽  
Flow And Heat Transfer ◽  
Excess Air ◽  
Turbulence Generation

The objective of this paper is to simulate turbulent flow and heat transfer in industrial porous burners. Transport equations are written in their time-and-volume-averaged form and a volume-based statistical turbulence model is applied to simulate the intra-porous turbulence generation. Combustion is modeled via a simple closure. Preliminary testing results indicate that a substantially different flow pattern is obtained depending on the model used. In addition, for high inlet flow rates or high excess air, the flame front moves towards the exit of the chamber.

Simulation of Turbulent Combustion in Inert Porous Media Using a Thermal Non-Equilibrium Model

2009 ◽  
Author(s):  
Marcelo J. S. de Lemos
Keyword(s):  
Porous Media ◽  
Temperature Distribution ◽  
Turbulent Combustion ◽  
Radiation Transport ◽  
Porous Matrix ◽  
Simple Closure ◽  
Excess Air ◽  
Methane Mixture ◽  
Mechanical Models ◽  
Turbulence Generation

The objective of this paper is to show numerical simulations of combustion of an air/methane mixture in porous materials. Here, a model that considers the intrapore levels of turbulent kinetic energy is used. Transport equations are written in their time-and-volume-averaged form and a volume-based statistical turbulence model is applied to simulate turbulence generation due to the porous matrix. Different thermo-mechanical models are compared, namely Laminar, Laminar with Radiation Transport, Turbulent, Turbulent with Radiation Transport. Combustion is modeled via a unique simple closure. Results indicate that a substantially different temperature distribution is obtained depending on the model used. In addition, for high excess air, peak gas temperatures are reduced.

NON-DARCY FLUID FLOW AND HEAT TRANSFER IN CONDUITS FITTED WITH POROUS MEDIA

2015 ◽  
Vol 18 (4) ◽  
pp. 449-453 ◽  
Author(s):  
Abdulmajeed A. Mohamad ◽  
Jamel Orfi ◽  
H. Al-Ansary
Keyword(s):  
Heat Transfer ◽  
Porous Media ◽  
Fluid Flow ◽  
Flow And Heat Transfer

Numerical Study on Flow and Heat Transfer of a Cooled First Stage Vane of a Gas Turbine

2016 ◽  
Author(s):  
Lv Ye ◽  
Zhao Liu ◽  
Xiangyu Wang ◽  
Zhenping Feng
Keyword(s):  
Heat Transfer ◽  
Gas Turbine ◽  
Film Cooling ◽  
Numerical Study ◽  
Coolant Flow ◽  
The Other ◽  
Edge Region ◽  
Flow Rates ◽  
Flow And Heat Transfer ◽  
Film Cooling Holes

This paper presents a numerical simulation of composite cooling on a first stage vane of a gas turbine, in which gas by fixed composition mixture is adopted. To investigate the flow and heat transfer characteristics, two internal chambers which contain multiple arrays of impingement holes are arranged in the vane, several arrays of pin-fins are arranged in the trailing edge region, and a few arrays of film cooling holes are arranged on the vane surfaces to form the cooling film. The coolant enters through the shroud inlet, and then divided into two parts. One part is transferred into the chamber in the leading edge region, and then after impinging on the target surfaces, it proceeds further to go through the film cooling holes distributed on the vane surface, while the other part enters into the second chamber immediately and then exits to the mainstream in two ways to effectively cool the other sections of the vane. In this study, five different coolant flow rates and six different inlet pressure ratios were investigated. All the cases were performed with the same domain grids and same boundary conditions. It can be concluded that for the internal surfaces, the heat transfer coefficient changes gradually with the coolant flow rate and the inlet total pressure ratio, while for the external surfaces, the average cooling effectiveness increases with the increase of coolant mass flow rates while decreases with the increase of the inlet stagnation pressure ratios within the study range.

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