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Simulation of a Simplified Aeroengine Bearing Chamber Using a Fully Coupled Two-Way Eulerian Thin Film/Discrete Phase Approach Part I: Film Behavior Near the Bearing (2021)
Journal Article
Nicoli, A., Johnson, K., & Jefferson-Loveday, R. (2021). Simulation of a Simplified Aeroengine Bearing Chamber Using a Fully Coupled Two-Way Eulerian Thin Film/Discrete Phase Approach Part I: Film Behavior Near the Bearing. Journal of Engineering for Gas Turbines and Power, 143(10), 1-12. https://doi.org/10.1115/1.4051560

Previous work at the Gas Turbine and Transmissions Research Center (G2TRC) has highlighted the need for an adequate computational model, which can appropriately model the oil shedding behavior from bearings. Oil can break up forming droplets and liga... Read More about Simulation of a Simplified Aeroengine Bearing Chamber Using a Fully Coupled Two-Way Eulerian Thin Film/Discrete Phase Approach Part I: Film Behavior Near the Bearing.

Assessment of the Oil Scoop Capture Efficiency in High Speed Rotors (2018)
Journal Article
Paleo Cageao, P., Simmons, K., Prabhakar, A., & Chandra, B. (2019). Assessment of the Oil Scoop Capture Efficiency in High Speed Rotors. Journal of Engineering for Gas Turbines and Power, 141(1), Article 012401. https://doi.org/10.1115/1.4040812

Experimental research was conducted into a scooped rotor system that captures oil from a stationary jet and directs it through passages within the shaft to another axial location. Such a system has benefits for delivering oil via under-race feed to a... Read More about Assessment of the Oil Scoop Capture Efficiency in High Speed Rotors.

Experimental investigation into gas turbine oil scoop capture efficiency (2018)
Journal Article
Paleo Cageao, P., Simmons, K., Prabhakar, A., & Chandra, B. (2019). Experimental investigation into gas turbine oil scoop capture efficiency. Journal of Engineering for Gas Turbines and Power, 141(1), Article 012401. https://doi.org/10.1115/1.4040812

Experimental research was conducted into a scooped rotor system that captures oil from a stationary jet and directs it through passages within the shaft to another axial location. Such a system has benefits for delivering oil via under-race feed to a... Read More about Experimental investigation into gas turbine oil scoop capture efficiency.

Mechanisms for Residence Volume Reduction in Shallow Sump (2017)
Journal Article
Chandra, B., Simmons, K., & Murphy, A. (2018). Mechanisms for Residence Volume Reduction in Shallow Sump. Journal of Engineering for Gas Turbines and Power, 140(3), Article 032601. https://doi.org/10.1115/1.4037871

© 2018 by ASME. Gas turbine aero-engines employ fast rotating shafts that are supported by bearings at several axial locations along the engine. Due to extreme load and heat, oil is injected to the bearings to aid lubrication and cooling. The oil is... Read More about Mechanisms for Residence Volume Reduction in Shallow Sump.

Innovative shallow sump customizations for aero-engine bearing chambers (2016)
Presentation / Conference Contribution
Chandra, B., & Simmons, K. (2016). Innovative shallow sump customizations for aero-engine bearing chambers.

Aero-engines incorporate various bearing chambers and these typically contain bearings, seals, rotating shafts, stationary walls and struts, and sometimes gears. Oil is supplied for lubrication and cooling and is removed (scavenged) from the sump reg... Read More about Innovative shallow sump customizations for aero-engine bearing chambers.

A study of droplet impact on static films using the BB-LIF technique (2016)
Journal Article
Hann, D. B., Cherdantsev, A. V., Mitchell, A., McCarthy, I., Hewakandamby, B. N., & Simmons, K. (2016). A study of droplet impact on static films using the BB-LIF technique. Experiments in Fluids, 57(46), https://doi.org/10.1007/s00348-016-2132-x

This paper presents results of single droplet impacts on films of different height taken using the Brightness Based Laser Induced Fluorescence technique (BB-LIF). The dynamics of drop impingement such as the shape of the cavity, residual film thickne... Read More about A study of droplet impact on static films using the BB-LIF technique.

Experimental investigation into droplet impingement upon moving films using high speed video and thermal imaging (2015)
Presentation / Conference Contribution
Mitchell, A. J., Simmons, K., & Hann, D. B. (2015). Experimental investigation into droplet impingement upon moving films using high speed video and thermal imaging. In Volume 1: Advances in Aerospace Technology. https://doi.org/10.1115/IMECE2015-51677

Aeroengine bearing chambers are geometrically complex, typically containing shafts, bearings, seals and stationary components. Oil is supplied for lubrication and cooling and so the chamber contains a highly rotating two-phase (oil/air) flow where th... Read More about Experimental investigation into droplet impingement upon moving films using high speed video and thermal imaging.

Velocity measurements in the vicinity of the exit and inlet of a spiral bevel gear shroud (2015)
Presentation / Conference Contribution
Simmons, K., & Johnson, G. (2015). Velocity measurements in the vicinity of the exit and inlet of a spiral bevel gear shroud. In Volume 5C: Heat Transfer. https://doi.org/10.1115/GT2015-43549

In many aeroengines the accessory power offtake is achieved using a spiral bevel gear set running off one of the main shafts. The crown and bevel gears are housed in an internal gearbox. Over the past few years the Nottingham University Technology Ce... Read More about Velocity measurements in the vicinity of the exit and inlet of a spiral bevel gear shroud.

Computational investigation of flows and pressure fields associated with spur gear meshing (2014)
Presentation / Conference Contribution
Baydu, C. A., Simmons, K., & Morvan, H. (2014). Computational investigation of flows and pressure fields associated with spur gear meshing. In Volume 5C: Heat Transfer. https://doi.org/10.1115/GT2014-26145

The efficiency of power transmission systems is increasingly targeted with a view to reducing parasitic losses and improving specific fuel consumption (SFC). One of the effects associated with such parasitic losses is the successive compression and e... Read More about Computational investigation of flows and pressure fields associated with spur gear meshing.

Characterising Horizontal Two-Phase Flows Using Structured-Planar Laser-Induced Fluorescence (S-PLIF) Coupled With Simultaneous Two-Phase PIV (S2P-PIV)
Presentation / Conference Contribution
Sherif, A. A., Hann, D. B., & Johnson, K. (2024, July). Characterising Horizontal Two-Phase Flows Using Structured-Planar Laser-Induced Fluorescence (S-PLIF) Coupled With Simultaneous Two-Phase PIV (S2P-PIV). Presented at 21st International Symposium on Applications of Laser and Imaging Techniques to Fluid Mechanics, Lisbon, Portugal

Understanding the physics that underpins the behaviors of two-phase flows is immensely useful for a diverse number of industries, including oil and gas, nuclear, and aerospace. Stratified air-liquid two-phase flows are amenable to the application of two... Read More about Characterising Horizontal Two-Phase Flows Using Structured-Planar Laser-Induced Fluorescence (S-PLIF) Coupled With Simultaneous Two-Phase PIV (S2P-PIV).

Computational Study of a Customised Shallow-Sump Aero-Engine Bearing Chamber With Inserts to Improve Oil Residence Volume
Presentation / Conference Contribution
Adeniyi, A. A., Chandra, B., & Simmons, K. (2017, June). Computational Study of a Customised Shallow-Sump Aero-Engine Bearing Chamber With Inserts to Improve Oil Residence Volume. Presented at ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition, Charlotte, North Carolina, USA

An aero-engine bearing chamber is a structure that is used to contain and collect oil used in lubricating and cooling the bearings supporting the high-speed engine shafts. There are various bearings in an aero-engine. Within the bearing chambers, the... Read More about Computational Study of a Customised Shallow-Sump Aero-Engine Bearing Chamber With Inserts to Improve Oil Residence Volume.

Effect of Turbulence Damping in VOF Simulation of an Aero-Engine Bearing Chamber
Presentation / Conference Contribution
Bristot, A., Morvan, H., Simmons, K., & Klingsporn, M. (2017, June). Effect of Turbulence Damping in VOF Simulation of an Aero-Engine Bearing Chamber. Presented at ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition, Charlotte, North Carolina, USA

In aero-engine bearing chambers, the modelling of sheardriven oil films with the Volume of Fluid method poses significant challenges linked with the need to accurately capture the gasliquid interaction at the free surface. Typically, the modelling of... Read More about Effect of Turbulence Damping in VOF Simulation of an Aero-Engine Bearing Chamber.

Effect of Vortex Shedding on the Performance of Scoop Based Lubrication Devices
Presentation / Conference Contribution
Prabhakar, A., Abakr, Y. A., & Simmons, K. (2017, June). Effect of Vortex Shedding on the Performance of Scoop Based Lubrication Devices. Presented at ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition, Charlotte, North Carolina, USA

In civil aircraft aeroengine bearing chambers it is sometimes difficult to feed oil to bearings using the traditional under-race or targeted jet approaches. In such situations one proposed solution is that of a scoop delivery system. Published experi... Read More about Effect of Vortex Shedding on the Performance of Scoop Based Lubrication Devices.

Experimental investigation of oil shedding from an aero-engine ball bearing at moderate speeds
Presentation / Conference Contribution
Santhosh, R., Hee, J. L., Simmons, K., Johnson, G., Hann, D., & Walsh, M. (2017, June). Experimental investigation of oil shedding from an aero-engine ball bearing at moderate speeds. Presented at ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition, Charlotte, North Carolina, USA

In civil aero-engine transmission system bearings are used for shaft location and load support. An experimental test facility in the University of Nottingham's Gas Turbine Transmissions Research Centre (G2TRC) was designed and commissioned to investi... Read More about Experimental investigation of oil shedding from an aero-engine ball bearing at moderate speeds.

Oil film thickness measurements on surfaces close to an aeroengine ball bearing using optical techniques
Presentation / Conference Contribution
Hee, J. L., Santhosh, R., Simmons, K., Johnson, G., Hann, D., & Walsh, M. (2017, June). Oil film thickness measurements on surfaces close to an aeroengine ball bearing using optical techniques. Presented at ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition, Charlotte, North Carolina, USA

In a civil aero-engine transmission system a number of bearings are used for shaft location and load support. A bespoke experimental test facility in the University of Nottingham's Gas Turbine and Transmissions Research Centre (G2TRC) was created to... Read More about Oil film thickness measurements on surfaces close to an aeroengine ball bearing using optical techniques.

Oil scoop simulation and analysis using CFD and SPH
Presentation / Conference Contribution
Korsukova, E., Kruisbrink, A., Morvan, H., Paleo Cageao, P., & Simmons, K. (2016, June). Oil scoop simulation and analysis using CFD and SPH. Presented at ASME Turbo Expo 2016: Turbine Technical Conference and Exposition, Seoul, South Korea

Oil film thickness measurements on surfaces close to an aeroengine ball bearing using optical techniques
Presentation / Conference Contribution
Hee, J. L., Santhosh, R., Simmons, K., Johnson, G., Hann, D., & Walsh, M. (2017, June). Oil film thickness measurements on surfaces close to an aeroengine ball bearing using optical techniques. Presented at ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition, Charlotte North Carolina, USA

In a civil aero-engine transmission system a number of bearings are used for shaft location and load support. A bespoke experimental test facility in the University of Nottingham's Gas Turbine and Transmissions Research Centre (G2TRC) was created to... Read More about Oil film thickness measurements on surfaces close to an aeroengine ball bearing using optical techniques.

Experimental Investigation Into Oil Film Thickness and Behaviour Near an Aero-Engine Bearing
Presentation / Conference Contribution
Sinha, A., Hann, D., Johnson, K., & Walsh, M. (2022, June). Experimental Investigation Into Oil Film Thickness and Behaviour Near an Aero-Engine Bearing. Presented at ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition, Rotterdam, Netherlands

In an aero-engine transmission system, bearings are used for shaft location and load support. These bearings are housed in bearing chambers and oil is supplied to the chamber for lubrication and cooling. To achieve the targets of ACARE Flight-path 20... Read More about Experimental Investigation Into Oil Film Thickness and Behaviour Near an Aero-Engine Bearing.