Phil Bowen - Academia.edu (original) (raw)

Papers by Phil Bowen

Research paper thumbnail of LCRI 2015 Overview of LCRI Research 2008 to 2015

The Low Carbon Research Institute (LCRI) was set up in 2008 to unite and promote energy research ... more The Low Carbon Research Institute (LCRI) was set up in 2008 to unite and promote energy research in Wales to help deliver a low carbon future. Working with industry and government, the LCRI’s research agenda included low to zero carbon energy supply systems, reduced energy demand, knowledge and skills transfer, and dissemination and industry partnerships. Since 2008 many successful projects highlighted in this report, have been realised. The scale of which is impressive and can serve as an excellent example of outcomes of value made possible through research funding.

Research paper thumbnail of Flashing liquid jets and two-phase droplet dispersion

Journal of Hazardous Materials, 2007

Research paper thumbnail of Two-phase jet releases and droplet dispersion: rainout experiments and model validation

Research paper thumbnail of GCESD8615 CFD predictions of Swirl burner aerodynamics with variable outlet configurations

Research paper thumbnail of Blowoff propensity, CRZs and Flow Turbulent structure using a range of Syngas compositions for Gas Turbines a* a a a Hesham Baej , Agustin Valera-Medina , Nick Syred , Richard Marsh , Phil Bowen

Research paper thumbnail of Stretch rate effects and flame surface densities in premixed turbulent combustion up to 1.25 MPa

Combustion and Flame, 2015

Research paper thumbnail of Detailed Investigation of the Influence of Fluid Viscosity on the Performance Characteristics of Plain-Orifice Effervescent Atomizers

Atomization and Sprays, 2001

Research paper thumbnail of Methane-Oxygen Flame Stability in a Generic Premixed Gas Turbine Swirl Combustor at Varying Thermal Power and Pressure

Volume 4B: Combustion, Fuels and Emissions, 2015

ABSTRACT

Research paper thumbnail of High Momentum Flow Region and Central Recirculation Zone Interaction in Swirling Flows

‘Fuel-flexible’ gas turbines will be required over the next 20 years at least. However, this cont... more ‘Fuel-flexible’ gas turbines will be required over the next 20 years at least. However, this contrasts with recent experiences of global operators who report increasing emissions and difficult combustion dynamics with even moderate variations in the fuel supply. Swirl stabilized combustion, being the most widely spread technology to control combustion in gas turbines, will be a technology needed for dynamic stabilization of the flow field. However, the features of the recirculation zone are highly complex, three dimensional and time dependent, depending on a variety of parameters. A high momentum flow region inherent to swirling flows has attracted the attention of several groups interested in blowoff and stretch flame phenomena. Therefore, this study focuses on experimental results obtained to characterise the relation between the central recirculation zone and the high momentum flow region under moderate swirl levels using a well-studied tangential swirl burner for power generatio...

Research paper thumbnail of TRANSIENT 3D ANALYSIS OF A Dl GASOLINE INJECTOR SPRAY

Atomization and Sprays, 1999

Research paper thumbnail of Effect of Swirl Number and Fuel Type upon the Flashback in Swirl Combustors

49th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, 2011

Research paper thumbnail of Evaluation of a Particulate Sampling Methodology From a Gas Turbine Exhaust Using Real-Time Size and Number Analysis at Simulated Aircraft Conditions

Volume 2: Combustion, Fuels and Emissions, Parts A and B, 2010

ABSTRACT Two differential mobility spectrometers (DMS 500) were used to measure particulate size ... more ABSTRACT Two differential mobility spectrometers (DMS 500) were used to measure particulate size distributions and particulate matter losses in the exhaust of a simulated gas turbine combustor test rig. The rig is a stable gas turbine combustor simulator providing particles of physicochemical properties analogous to real aircraft engines. The rig ran at three operating conditions, giving a range of organic to elemental carbon distributions, allowing different aerosol compositions to be formed for comparison and analysis of transport losses. Smoke number from a recognised filter stain method and gas analysis of the exhaust were also taken to prove representative engine conditions. The two instruments were separated by 10m of heated stainless steel sample line and a range of transitional to turbulent flow rates from 19L/min to 64L/min were utilised for the comparative analysis. The aerosols showed measureable transport losses dependant on organic fraction, while flow rate showed substantial effects dependent on the flow state within the line. Comparisons made to the particle transport loss model from United Technologies Research Center show agreement in trend losses relative to size distribution of the particulate matter, but with losses being higher than predicted.

Research paper thumbnail of A Comparison of CFD and Lda Studies of Internal Vortex Cooling Systems for Turbine Blades

Journal of Flow Visualization and Image Processing, 1998

Research paper thumbnail of An Integrated Thermo-fluid, Chemical Kinetic Model for Pulse Combustors

42nd AIAA Aerospace Sciences Meeting and Exhibit, 2004

ABSTRACT

Research paper thumbnail of Impacts on Blowoff by a Variety of CRZs Using Various Gases for Gas Turbines

Research paper thumbnail of Mass and Size Distribution Measurements of Particulates from a Gas Turbine Combustor Using Modern Mobility Analyzer and Particle Sizer

45th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2009

Research paper thumbnail of Effect of Swirl Number and Fuel Type Upon the Combustion Limits in Swirl Combustors

Volume 2: Combustion, Fuels and Emissions, Parts A and B, 2011

Increasing interest in lean fuel premixed swirl combustors has arisen because of reduced NOx emis... more Increasing interest in lean fuel premixed swirl combustors has arisen because of reduced NOx emissions. Alternative fuels, including hydrogen-enriched natural gas and by products of process industries such as coke oven gas are now receiving increasing attention. This ...

Research paper thumbnail of Experimental Investigation of the Effects of Fuel Characteristics on High Efficiency Clean Combustion in a Light-Duty Diesel Engine

SAE Technical Paper Series, 2009

Research paper thumbnail of Central Recirculation Zone Visualization in Confined Swirl Combustors for Terrestrial Energy

Journal of Propulsion and Power, 2013

ABSTRACT This study characterizes the central recirculation zones formed under combustion conditi... more ABSTRACT This study characterizes the central recirculation zones formed under combustion conditions, with natural gas as fuel with different geometries and degrees of premixing using a swirl combustor firing into a confinement representative of gas turbine combustors. Phase-locked particle image velocimetry is used as the main method of characterization. The technique enables characterization of the time-dependent behavior of the central recirculation zone and a three-dimensional reconstruction of its boundaries. The central recirculation zone typically had an asymmetric lobed shape and precessed about the central axis. Partially premixed combustion at near-stoichiometric equivalence ratios reduced the coherence of the central recirculation zone and often caused it to nearly disappear, although a small remnant of recirculation could still be found in the three-dimensional space. Lower equivalence ratios strengthened the central recirculation zone considerably, for both non-premixed and partially premixed combustion. Although the central recirculation zone was asymmetric in shape and precessed about the central axis, the precessing vortex core, commonly found in these flows, was found to be significantly suppressed especially when central fuel injectors were used. Its occurrence then became intermittent and irregular. A quarl exit nozzle with a divergent lip was found to reduce flame attachment to the fuel injector.

Research paper thumbnail of A laser induced fluorescence technique for quantifying transient liquid fuel films utilising total internal reflection

Experiments in Fluids, 2010

Research paper thumbnail of LCRI 2015 Overview of LCRI Research 2008 to 2015

The Low Carbon Research Institute (LCRI) was set up in 2008 to unite and promote energy research ... more The Low Carbon Research Institute (LCRI) was set up in 2008 to unite and promote energy research in Wales to help deliver a low carbon future. Working with industry and government, the LCRI’s research agenda included low to zero carbon energy supply systems, reduced energy demand, knowledge and skills transfer, and dissemination and industry partnerships. Since 2008 many successful projects highlighted in this report, have been realised. The scale of which is impressive and can serve as an excellent example of outcomes of value made possible through research funding.

Research paper thumbnail of Flashing liquid jets and two-phase droplet dispersion

Journal of Hazardous Materials, 2007

Research paper thumbnail of Two-phase jet releases and droplet dispersion: rainout experiments and model validation

Research paper thumbnail of GCESD8615 CFD predictions of Swirl burner aerodynamics with variable outlet configurations

Research paper thumbnail of Blowoff propensity, CRZs and Flow Turbulent structure using a range of Syngas compositions for Gas Turbines a* a a a Hesham Baej , Agustin Valera-Medina , Nick Syred , Richard Marsh , Phil Bowen

Research paper thumbnail of Stretch rate effects and flame surface densities in premixed turbulent combustion up to 1.25 MPa

Combustion and Flame, 2015

Research paper thumbnail of Detailed Investigation of the Influence of Fluid Viscosity on the Performance Characteristics of Plain-Orifice Effervescent Atomizers

Atomization and Sprays, 2001

Research paper thumbnail of Methane-Oxygen Flame Stability in a Generic Premixed Gas Turbine Swirl Combustor at Varying Thermal Power and Pressure

Volume 4B: Combustion, Fuels and Emissions, 2015

ABSTRACT

Research paper thumbnail of High Momentum Flow Region and Central Recirculation Zone Interaction in Swirling Flows

‘Fuel-flexible’ gas turbines will be required over the next 20 years at least. However, this cont... more ‘Fuel-flexible’ gas turbines will be required over the next 20 years at least. However, this contrasts with recent experiences of global operators who report increasing emissions and difficult combustion dynamics with even moderate variations in the fuel supply. Swirl stabilized combustion, being the most widely spread technology to control combustion in gas turbines, will be a technology needed for dynamic stabilization of the flow field. However, the features of the recirculation zone are highly complex, three dimensional and time dependent, depending on a variety of parameters. A high momentum flow region inherent to swirling flows has attracted the attention of several groups interested in blowoff and stretch flame phenomena. Therefore, this study focuses on experimental results obtained to characterise the relation between the central recirculation zone and the high momentum flow region under moderate swirl levels using a well-studied tangential swirl burner for power generatio...

Research paper thumbnail of TRANSIENT 3D ANALYSIS OF A Dl GASOLINE INJECTOR SPRAY

Atomization and Sprays, 1999

Research paper thumbnail of Effect of Swirl Number and Fuel Type upon the Flashback in Swirl Combustors

49th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, 2011

Research paper thumbnail of Evaluation of a Particulate Sampling Methodology From a Gas Turbine Exhaust Using Real-Time Size and Number Analysis at Simulated Aircraft Conditions

Volume 2: Combustion, Fuels and Emissions, Parts A and B, 2010

ABSTRACT Two differential mobility spectrometers (DMS 500) were used to measure particulate size ... more ABSTRACT Two differential mobility spectrometers (DMS 500) were used to measure particulate size distributions and particulate matter losses in the exhaust of a simulated gas turbine combustor test rig. The rig is a stable gas turbine combustor simulator providing particles of physicochemical properties analogous to real aircraft engines. The rig ran at three operating conditions, giving a range of organic to elemental carbon distributions, allowing different aerosol compositions to be formed for comparison and analysis of transport losses. Smoke number from a recognised filter stain method and gas analysis of the exhaust were also taken to prove representative engine conditions. The two instruments were separated by 10m of heated stainless steel sample line and a range of transitional to turbulent flow rates from 19L/min to 64L/min were utilised for the comparative analysis. The aerosols showed measureable transport losses dependant on organic fraction, while flow rate showed substantial effects dependent on the flow state within the line. Comparisons made to the particle transport loss model from United Technologies Research Center show agreement in trend losses relative to size distribution of the particulate matter, but with losses being higher than predicted.

Research paper thumbnail of A Comparison of CFD and Lda Studies of Internal Vortex Cooling Systems for Turbine Blades

Journal of Flow Visualization and Image Processing, 1998

Research paper thumbnail of An Integrated Thermo-fluid, Chemical Kinetic Model for Pulse Combustors

42nd AIAA Aerospace Sciences Meeting and Exhibit, 2004

ABSTRACT

Research paper thumbnail of Impacts on Blowoff by a Variety of CRZs Using Various Gases for Gas Turbines

Research paper thumbnail of Mass and Size Distribution Measurements of Particulates from a Gas Turbine Combustor Using Modern Mobility Analyzer and Particle Sizer

45th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2009

Research paper thumbnail of Effect of Swirl Number and Fuel Type Upon the Combustion Limits in Swirl Combustors

Volume 2: Combustion, Fuels and Emissions, Parts A and B, 2011

Increasing interest in lean fuel premixed swirl combustors has arisen because of reduced NOx emis... more Increasing interest in lean fuel premixed swirl combustors has arisen because of reduced NOx emissions. Alternative fuels, including hydrogen-enriched natural gas and by products of process industries such as coke oven gas are now receiving increasing attention. This ...

Research paper thumbnail of Experimental Investigation of the Effects of Fuel Characteristics on High Efficiency Clean Combustion in a Light-Duty Diesel Engine

SAE Technical Paper Series, 2009

Research paper thumbnail of Central Recirculation Zone Visualization in Confined Swirl Combustors for Terrestrial Energy

Journal of Propulsion and Power, 2013

ABSTRACT This study characterizes the central recirculation zones formed under combustion conditi... more ABSTRACT This study characterizes the central recirculation zones formed under combustion conditions, with natural gas as fuel with different geometries and degrees of premixing using a swirl combustor firing into a confinement representative of gas turbine combustors. Phase-locked particle image velocimetry is used as the main method of characterization. The technique enables characterization of the time-dependent behavior of the central recirculation zone and a three-dimensional reconstruction of its boundaries. The central recirculation zone typically had an asymmetric lobed shape and precessed about the central axis. Partially premixed combustion at near-stoichiometric equivalence ratios reduced the coherence of the central recirculation zone and often caused it to nearly disappear, although a small remnant of recirculation could still be found in the three-dimensional space. Lower equivalence ratios strengthened the central recirculation zone considerably, for both non-premixed and partially premixed combustion. Although the central recirculation zone was asymmetric in shape and precessed about the central axis, the precessing vortex core, commonly found in these flows, was found to be significantly suppressed especially when central fuel injectors were used. Its occurrence then became intermittent and irregular. A quarl exit nozzle with a divergent lip was found to reduce flame attachment to the fuel injector.

Research paper thumbnail of A laser induced fluorescence technique for quantifying transient liquid fuel films utilising total internal reflection

Experiments in Fluids, 2010