scholarly journals The Effect of Jet Mixing on the Combustion Efficiency of a Hot Fuel-Rich Cross-Flow

2001 ◽  
Vol 163 (1) ◽  
pp. 211-228 ◽  
Author(s):  
M. BOUTAZAKHTI ◽  
M J. THOMSON ◽  
M. LIGHTSTONE
Keyword(s):  
Cross Flow ◽  
Combustion Efficiency ◽  
Jet Mixing

Vortex modeling of single and multiple dilution jet mixing in a cross flow

1986 ◽  
Vol 2 (4) ◽  
pp. 354-360 ◽  
Author(s):  
A. R. Karagozian ◽  
T. T. Nguyen ◽  
C. N. Kim
Keyword(s):  
Cross Flow ◽  
Jet Mixing

Modulation of a Liquid-Fuel Jet in an Unsteady Cross-Flow

2001 ◽  
Author(s):  
Torger J. Anderson ◽  
William Proscia ◽  
Jeffrey M. Cohen
Keyword(s):  
Cross Flow ◽  
Flow Modulation ◽  
Jet Mixing ◽  
Physical Mechanisms ◽  
Fuel Flow ◽  
Fuel Jet ◽  
Spray Density ◽  
Jet Behavior ◽  
Unique Method ◽  
Spray Distribution

This paper describes an experimental study of a fuel jet in an unsteady cross flow as part of a program to evaluate active control of combustion instabilities that involve acoustic / spray coupling. The results provide insights into the different physical mechanisms through which the jet and cross flow interact and the degree to which acoustic velocity fluctuations modulate liquid jet mixing, penetration and spray distribution. They also provide a means of evaluating the effectiveness of fuel flow modulation for controlling fuel jet behavior, demonstrating that fluctuations in the downstream spray distribution can be significantly reduced by phased fuel flow modulation. The paper describes a unique method for modulating the fuel and a relatively simple diagnostic for evaluating the fuel spray density and uniformity.

LES/FMDF of turbulent reacting jet in cross-flow

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Mostafa Esmaeili ◽  
Asghar Afshari
Keyword(s):  
Mass Density ◽  
Cross Flow ◽  
Combustion Efficiency ◽  
Content Type ◽  
Eddy Simulation ◽  
Jet In Cross Flow ◽  
Large Eddy ◽  
Flow Features ◽  
Hybrid Solver ◽  
Good Agreement

Purpose This study aims to numerically investigate the flow features and mixing/combustion efficiencies in a turbulent reacting jet in cross-flow by a hybrid Eulerian-Lagrangian methodology. Design/methodology/approach A high-order hybrid solver is employed where, the velocity field is obtained by solving the Eulerian filtered compressible transport equations while the species are simulated by using the filtered mass density function (FMDF) method. Findings The main features of a reacting JICF flame are reproduced by the large-eddy simulation (LES)/FMDF method. The computed mean and root-mean-square values of velocity and mean temperature field are in good agreement with experimental data. Reacting JICF’s with different momentum ratios are considered. The jet penetrates deeper for higher momentum ratios. Mixing and combustion efficiency are improved by increasing the momentum ratio. Originality/value The authors investigate the flow and combustion characteristics in subsonic reacting JICFs for which very limited studies are reported in the literature.

The Influence of Dilution Hole Geometry on Jet Mixing

1989 ◽  
Author(s):  
J. F. Carrotte ◽  
S. J. Stevens
Keyword(s):  
Cross Flow ◽  
Flux Ratio ◽  
Operating Conditions ◽  
Test Facility ◽  
Temperature Pattern ◽  
Jet Mixing ◽  
Discharge Coefficients ◽  
Heated Air ◽  
Random Manner ◽  
Hole Geometry

Measurements have been made on a fully annular test facility, downstream of a row of heated dilution jets injected normally into a confined cross-flow at a momentum flux ratio of 4. The investigation concentrated on the consistency of mixing between the jets, as indicated by the regularity of the temperature pattern around the cross-flow annulus. When the heated air was supplied from a representative feed annulus, the exit velocity profile across each plunged hole was significantly altered and caused a distortion of the temperature distribution in the ensuing jet. The degree of distortion varies in a random manner, so that each jet has its own mixing characteristics thereby producing irregularity of the temperature pattern around the annulus. With the same approach and operating conditions some of the plunged dilution holes were modified, and tests on this modified sector indicated a significant improvement in the circumferential regularity of the temperature pattern. Further tests showed these modifications to the dilution holes had a negligible effect on the values of the discharge coefficients.

scholarly journals Effect of Cross-flow Momentum on Opposing Jet Mixing

2014 ◽  
Vol 6 (3) ◽  
pp. 1-8
Author(s):  
Takahisa Nagao ◽  
Shinsuke Matsuno ◽  
A.Koichi Hayashi
Keyword(s):  
Cross Flow ◽  
Jet Mixing

Numerical Analysis of Turbulent Mixing in Cross Flow Configurations

2019 ◽  
Author(s):  
Kashyap Patel ◽  
Chaina Ram ◽  
Vishal Rasaniya
Keyword(s):  
Gas Turbine ◽  
Pressure Loss ◽  
Cross Flow ◽  
Combustion Efficiency ◽  
Mixing Rate ◽  
Turbine Engine ◽  
Mixing Behavior ◽  
Upstream Direction ◽  
Sst Turbulence Model ◽  
Flow Configurations

Abstract The gas turbine combustion chamber is a vital part of a gas turbine engine. Proper mixing of air in the combustor plays an important role in combustion. Increasing mixing rate is an important factor for better combustion efficiency. The injection of air in crossflow is widely studied over the years. The air injected at an angle in upstream direction gives better mixing by colliding with the crossflow. The computational analysis of the injected jet in cross flow is performed with different angles in the upstream direction. The k-omega SST turbulence model was used to investigate the mixing behavior. The air is injected at different angles and observed that with an increase in angle from 60° to 135°, the rate of mixing and turbulent intensity increased. The jet inclination in the upstream direction greatly influenced the mixing behavior. The jet penetration in perpendicular direction was almost the same for 120° and 135°. But there is added penalty in the form of the pressure loss at the angle 135°. So considering the pressure loss and ease of manufacturing the 120° jet inclination is preferable for better mixing among the four cases studied here. The idea of inclining jet in upstream direction can be implemented on the combustor for increased performance and shorter size.

Modeling Air Jet Penetration Into Gas-Particle Suspension Cross Flow

2003 ◽  
Author(s):  
Ville Tossavainen ◽  
Reijo Karvinen ◽  
Matti Ylitalo
Keyword(s):  
Numerical Modeling ◽  
Cross Flow ◽  
Full Scale ◽  
Design Tool ◽  
Particle Suspension ◽  
Jet Mixing ◽  
Pilot Unit ◽  
Air Jet ◽  
Jet Penetration ◽  
Boiler Design

In the paper, numerical modeling of air jet mixing in gas–particle suspension is discussed. The theory on which the modeling is based on is presented and to get a reliable opinion of its capability as a boiler design tool, the results are compared with those obtained experimentally in a cold pilot boiler. Based on the research on the pilot unit, the modeling seems to give reliable results. The modeling has also been applied to a full-scale boiler.

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