ansys combustion brochure

7/27/2019 ANSYS Combustion Brochure

1/4

Combustion Modeling

A large percent o worldwide energy conversion processes are based

on combustion. Sotware rom ANSYS oers a wide range o user-

riendly models to simulate the interactions between ow, turbulent

mixing, heat release and chemical reactions.

Turbulent Combustion

Because chemical kinetics are highly nonlinear, turbulencechemistry

interactions should be taken into account to accurately predictturbulent reacting ows. Fluid dynamics sotware rom ANSYS

oers a wide range o turbulencechemistry interaction models o

various complexities suitable or almost every turbulent reacting ow

application.

Fast Chemistry

The eddy dissipation model (EDM), in combination with the fnite

rate chemistry model, allows accurate simulation o the heat

release and the distribution o the main chemical species or many

industrial applications, such as gas turbines, internal combustion

engines, urnaces and thrusters. The EDM can be used or all types o

combustion as well as in combination with advanced scale-resolvingturbulence and multiphase models.

Non-Premixed Combustion

With the non-premixed (or diusion ame) model, the turbulence

chemistry interaction is described using an assumed shape o

probability density unction (PDF). The thermodynamic state o

the uid, related to the mixture raction and the chemistry is

calculated either rom equilibrium or by using a tabulated steady

amelet approach. The non-premixed model oers a robust and ast

solution or any turbulent reacting ow that is at or near chemical

equilibrium. This model is oten used or gas turbine, process urnace

and IC engine applications.

Low NOx burner

Courtesy John Zink Company

Swirl combustion chamber

Courtesy GE Energy

Biomass urnace

Courtesy TU Graz, Institut for Ressourcenschonendeund Nachhaltige Systeme

Industry Solutions


2/4

Premixed and Partial Premixed Combustion

For a premixed ame, an additional transport equation is solved or

the reaction progress variable, ame surace density or distance to

the ame ront. The solution o this variable predicts the position o

the ame ront. For closure o the source term, ANSYS oers dierent

proven correlations related to the turbulent burning velocity. These

correlations provide the best practical method to predict turbulent

premixed ames. In combination with the equilibrium or amelet

model, this approach is applicable to partially premixed and ully

premixed combustion.

Laminar Combustion and Stiff-Chemistry Systems

ANSYS CFD sotware is capable o incorporating simple and complex

reaction mechanisms to model reacting ows. Special solution

algorithms compute numerically sti chemical kinetic equations

efciently and robustly. It is also possible to import reaction mechanisms

in CHEMKIN ormat.

PDF transport and eddy dissipation concept (EDC) models incorporate

detailed chemical kinetics in general turbulent reacting ows or

which it cannot be assumed that the chemistry is close to equilibrium

conditions such as ame ignition and extinction, and slowly orming

pollutant species. In situ adaptive tabulation (ISAT), chemistry

agglomeration and mechanism reduction are available to make detailed

chemistry calculation more efcient and aordable.

Sotware rom ANSYS also enables use o surace reactions as they occur,

or example, in catalytic converters, chemical vapor deposition (CVD)

or uel cells. A sti-surace chemistry solver is available to handle an

arbitrary complex surace chemistry mechanism. It is possible to import

surace reaction mechanisms in CHEMKIN ormat.

All combustion models can be used with most o the turbulence models

including RANS, LES and hybrid turbulence models such as DES and SAS.

Pollutant Formation Model

Pollutant species, such as NOx, SOx or soot, typically can be calculated

by post-processing a combusting ow solution. ANSYS oers several

pathways to predict NOx ormation in gas, oil and coal ames using

thermal, uel and prompt NOx mechanisms and to predict NOx

reduction via re-burning or selective non-catalytic reduction (SNCR).

One- and two-step soot models are available; soot radiation can be

included in the simulation.

A general capability is available to solve any arbitrary pollutant

chemistry mechanism as post-processing on a rozen ow and

temperature feld.

Industry Solutions

Combustion chamber o a gas turbine

Courtesy MTU Aero Engines GmbH

Automotive heater

Courtesy Webasto AG

Evaporated diesel or an ATR

mixing chamber

Courtesy Forschungszentrum Julich GmbH


3/4

Multiphase (Fluid and Solid) Fuels

In many applications, uel is ed into the combustion chamber as a

uid or a solid. Examples are gasoline or diesel or internal combustion

engines or pulverized coal or power plants. In these cases ANSYS

provides a variety o multiphase models that are ully compatible with

the combustion models available in sotware rom ANSYS.

Liquid Fuels

For liquid spray uels, the common assumption is that the liquid can

be described with a EulerLagrange or EulerEuler model, and that

vaporization is complete beore the actual combustion process starts.

Once the vapor is in the gas phase, any o the ANSYS CFD combustion

models can be used to simulate the reactions.

Solid Fuels

Combusting solid uels generally undergo moisture evaporation and

devolatilization ollowed by combustion o volatiles in the gaseous

phase and heterogeneous gassolid reaction o the char. ANSYS

oers several devolatilization and char combustion models that

have been extensively tested on real applications. A general particle

surace reaction model also is available to accommodate any type

o heterogeneous reactions to model applications, such as sorbent

injections and gasifcation.

The ANSYS Combustion Team

The ANSYS combustion team is actively engaged in high-level research

and development projects and interacts directly with leaders in the

combustion research community. A long-standing partnership with

Robert J. Kee, George R. Brown Distinguished Proessor o Engineering

at the Colorado School o Mines and principal architect and developer

o CHEMKIN sotware, provides knowledge that assists in simulating

reacting and combusting ow. Interaction with Stephen B. Pope,proessor at Sibley School o Mechanical and Aerospace Engineering

at Cornell University, a leader in combustion ow modeling and one

o the originators o the PDF transport method and ISAT, has delivered

expertise in those areas. Long-term cooperation with Norbert Peters,

emeritus at the Institute or Combustion Technology at RWTH Aachen

University, provides insight into many aspects o combustion technology,

including amelet modeling. Expertise gained rom these leaders and

many others engaged in combusting and reacting ow research is

incorporated into ANSYS combustion technology.

Industry-tested experience by a team ocused on continued

enhancements ensures that ANSYS combustion models remain atthe leading edge o the technology and provides the highest quality

o model ormulation, consistency o implementation and careul

validation across a wide range o industrial applications.

Industry Solutions

Aircrat engine

Courtesy Pratt & Whitney Canada

Swirling eect on particles rom a

coal burner

Courtesy ESSS and Tractebel

Low NOx burner

Courtesy GE Energy and Environmental Research


4/4

The ANSYS Advantage

With the unequalled depth and unparalleled breadth o ANSYS

engineering simulation solutions, companies are transorming their

leading-edge design concepts into innovative products and processes

that work. Today, almost all the top 100 industrial companies on

the FORTUNEGlobal 500 invest in engineering simulation as a

key strategy to win in a globally competitive environment. They

choose ANSYS as their simulation partner, deploying the worlds most

comprehensive multiphysics solutions to solve their complex engineeringchallenges. The engineered scalability o solutions rom ANSYS delivers

the exibility customers need, within an architecture that is adaptable

to the processes and design systems o their choice. No wonder the

worlds most successul companies turn to ANSYS with a track

record o 40 years as the industry leader or the best in engineering

simulation.

Industry Solutions

ANSYS, Inc.Southpointe

275 Technology Drive

Canonsburg, PA 15317U.S.A.

724.746.3304

[email protected]

Toll Free U.S.A./Canada:1.866.267.9724

Toll Free Mexico:

001.866.267.9724Europe:

44.870.010.4456

[email protected]

ANSYS, ANSYS Workbench, Ansot, AUTODYN, CFX, FLUENT and any and all ANSYS, Inc. brand, product,

service and eature names, logos and slogans are registered trademarks or trademarks o ANSYS, Inc. or its

subsidiaries in the United States or other countries. ICEM CFD is a trademark used under license. All other

brand, product, service and eature names or trademarks are the property o their respective owners.

2010 ANSYS, Inc. All Rights Reserved. Printed in U.S.A. MKT0000534 11-10

ansys.com

Simulation o reacting ow in a gas

turbine combustor using scale adaptive

simulationCourtesy German Aerospace Center (DLR),Institute of Combustion Technology

Simulation o reacting ow in a gas

turbine combustor using scale adaptive

simulation

Courtesy German Aerospace Center (DLR),

Institute of Combustion Technology

Combustion chamber

Courtesy CADFEM Russia

ansys combustion brochure

Documents