Incorporation of Flamelet Generated Manifold Combustion ... · Non-reacting: Liquid/vapor pen. and...

Amin Maghbouli

Multiphase and Reactive Flows Group

Incorporation of

Flamelet Generated Manifold

Combustion Closure to

OpenFOAM and Lib-ICE

3rd Two-day Meeting on IC Engine

Simulations Using OpenFOAM Technology

22-23 Feb 2018 - Milano

Bart Somers

2 3rd Two-day Meeting on IC Engine Simulations Using OpenFOAM Technology 22-23 Feb 2018 - Milano

Contents:

Introduction to Chemistry Reduction Methods

FGM Implementation to OpenFOAM and Lib-ICE

Case Study

• Constant Volume Vessel | ECN Spray A

• Light Duty Diesel Engine | ECN Spray B

• Heavy Duty Diesel Engine | Sandia Engine

Conclusions

Contents:

Case Study

Conclusions

Chemical Kinetics of Reactive Flows

• Result in system of stiff ODE and solution for reaction rates requires

specific mathematical algorithms.

• Hinders prospective CFD simulations of reactive flows.

Chemistry Tabulation vs on-the-fly Chemistry

• Perfectly Stirred Reactor

• Approximated Diffusion Flemelet

• Flamelet Generated Manifolds Developed at TU/e

No integration for Chemistry

Look up routines for updating

sources

Direct integration for chemistry

Sources update after chemistry

integration

Progress Variable approach

Flame Types:

Contents:

Case Study

Conclusions

3rd Two-day Meeting on IC Engine Simulations Using OpenFOAM Technology 22-23 Feb 2018 - Milano

CHEM1D: 1D flamelet solver code:

Adaptive gridding

Implicit solver

Timestepper (real /false)

Flexible inlet composition

CHEMKIN III compatible

Thermal diffusion

Transport modelling

Unity Lewis numbers

Constant Lewis numbers

Different Flame Types

Mixture average

Flamelet Generated Manifolds

The Simulation of Flat Flames with Detailed and Reduced Chemical Models, Bart Somers

www.fgm-combustion.org

Tabulation of counter flow flamelets for Reacting Sprays

• CHEM1D solver code was used for

flamelet generation.

Oxidizer Fuel

Reaction Space – flamelet solver

• CHEM1D:

Includes different Flame Types:

FREE, BURNERSTABILIZED, COUNTERFLOW,

BIO, and …

Transport:

UNITY LEWIS, CONSTANT/VARIABLE LEWIS

CHEM1DMATLAB scripts

FGM table

Needed format

for table data

bash script for parallel

flamelet generation

Frozen Flamelet Method, FFM

for IC Engine applications

Table dimensions parametrization

& interpolation

Variable definition & calculation

Dimensions for tabulation of chemistry can be:

Progress variable

Mixture fraction

Unburned Temperature

Pressure

Segregated Mixture Fraction

Segregated Progress variable

Scalar Dissipation Rate

• Flamelet CFD solver for reacting spray and IC engine

• Source code for table dimensions and data handling

Lib-ICE:

4D Tables for IC Engines

FGMFlameletLibrary

class was incorporated to the Lib-ICE source

Source term from FGM tables

3- c, Z, P, Tu from CFD to Table

4- cdot from Table to Update CFD

2- Transport of c and Z Fields

Contents:

Case Study

Conclusions

Case Study: Constant Volume Vessel | ECN Spray A

Large set of experimental and

numerical data for non-reacting

and reacting operating conditions

Specifications for Spray A of the ECN

Fuel injector Bosch

Orifice diameter 0.090 mm

Nozzle K factor K = 1.5

Nozzle shaping Smoothed

Mini-sac volume 0.2 mm3

Discharge coefficient Cd = 0.86

Number of holes single hole

Orifice orientation Axial

Sandia

Non-reacting: Liquid/vapor pen. and Mixture Fraction distribution

Reacting: Ignition delay and Flame Lift-off

Experimental configuration

2D computational mesh

• Injection: blob• Breakup: KHRT• Evaporation: Spalding

CFD setup

• Turbulence model: standard k-e with modified C1

Test conditions

• Fuel n-dodecane• Nozzle diameter: 90 mm• pinj: 150 MPa• Tamb900 K• ramb : 22.8 kg/m3

Baseline operating condition

Exp.Sim.

Mixture Fraction

0.0 5.0 10.0

Distance from axis [mm]

PoliMI

z = 22.5 mm

z = 45 mm

Non-reacting: Liquid/vapor penetration

and Mixture Fraction distribution(RANS)

n-dodecane Chemistry:

Mechanism of Yao et al. was used. Yao et al.9th U. S. National

Combustion Meeting

54 species and 269 reactions

FGM: Table dimensions and progress variable definition

Spray A ambient composition

Reacting: Ignition Delay, PRR, Flame Lift-off

800 K 900 K 1000 K

Reacting: Ignition Delay, PRR, Flame Lift-off

800 K 900 K 1000 K

at 3 CAD ATDC

Contents:

Case Study

Conclusions

Case Study: Light Duty Diesel Engine | ECN Spray B

Sandia Optical Engine

Spray B – Bosch injector

Mie scattering• Color Phantom v611 • Frame rate 67kHz, • Exposure: 14us• Lens =85mm f/1.4

Liquid Penetration Length

Schlieren• Phantom v71 • Frame rate: 25kHz• Exposure: 19us• Lens: 105mm f/2.5

Vapor Penetration Length

Chimiluminescence OH* • Intensified Phantom v71 • Frame rate: 7.2kHz

(1CAD)• Exposure 55us• Lens: 105mm UV f/4.5

Flame Lift-off Length

SAE 2016-01-0743

Spray oriented grid

45,916 cells at TDC

48.7 and 11.2 for maximum and

average mesh non-orthogonality

341,562 cells at BDC

Operating conditions:

Non-reacting: Liquid/vapor penetration

Reacting: In-cylinder Pressure and AHRR

800 K 900 K 1000 K

Reacting: Flame Lift-off

800 K 900 K 1000 K

Reacting: Flame Lift-off

Contents:

Case Study

Conclusions

Case Study: Heavy Duty Diesel Engine | Sandia Engine

Operating conditions

SAE 2006-01-0055

Injected Mass = 16.2× Injected Mass

Heavy Duty Spray B

Non-reacting: Liquid penetration

Injected Mass = 16.2× Injected Mass

Heavy Duty Spray B

Operating conditions

Reacting: In-cylinder Pressure & AHRR

HT-Sh-ID HT-Lo-ID

Reacting: Flame Structure

HT-Sh-ID

HT-Lo-ID

at -5 CAD ATDC

HT-Sh-ID

HT-Lo-ID

at -4 CAD ATDC

HT-Sh-ID

HT-Lo-ID

at -1 CAD ATDC

HT-Sh-ID

HT-Lo-ID

at TDC

HT-Sh-ID

HT-Lo-ID

at 3 CAD ATDC

Contents:

Case Study

Heavy Duty Diesel Engine | Sandia Engine

Conclusions

Progress variable source provided by FGM tabulation was capable of accurate

predictions for state of thermodynamics of the mixture under non/partially

premixed combustion configurations.

FGM combustion closure was incorporated into OpenFOAM and Lib-ICE to

model reacting spray and Diesel engine conditions.

For studied ambient temperature conditions, results of ignition delay, PRR or

AHRR as well as flame lift-off was well agreeing with the experiments.

n-dodecane chemical kinetics still suffers from comprehensive mechanism for

low temperature combustion and there is a need for an extensively validated

mechanism.

Thanks for your attention!

contact: amin.maghbouli@gmail.com

Amin Maghbouli

Incorporation of Flamelet Generated Manifold Combustion ... · Non-reacting: Liquid/vapor pen. and...

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