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GT2022-82180 Experimental investigation into oil film thickness and behaviour near an aero-engine bearing (2022)
Conference Proceeding
Sinha, A., Hann, D., Johnson, K., & Walsh, M. (2022). GT2022-82180 Experimental investigation into oil film thickness and behaviour near an aero-engine bearing. In Proceedings of the ASME TURBO EXPO 2022: Turbomachinery Technical Conference & Exposition. GT 2022 June 13-17, 2022, Rotterdam, Netherlands. https://doi.org/10.1115/GT2022-82180

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 Flightpath 205... Read More about GT2022-82180 Experimental investigation into oil film thickness and behaviour near an aero-engine bearing.

Thermoacoustic Electricity Generator for Rural Dwellings in Developing World (2021)
Conference Proceeding
Kisha, W., & Hann, D. (2021). Thermoacoustic Electricity Generator for Rural Dwellings in Developing World. In Advances in Heat Transfer and Thermal Engineering: Proceedings of 16th UK Heat Transfer Conference (UKHTC2019) (893-897). https://doi.org/10.1007/978-981-33-4765-6_152

Thermoacoustic seems to be a promising technology for waste heat recovery (Blok in J. Acoust. Soc. Am. 123:3541–3541, 2008;Abdoulla-Latiwish et al. in Energy 134:1107–1120, 2017;) and are subject to steadily growing interest, particularly in the fiel... Read More about Thermoacoustic Electricity Generator for Rural Dwellings in Developing World.

Numerical Optimisation of the Regenerator of a Multi-stage Travelling Wave Thermoacoustic Electricity Generator (2021)
Conference Proceeding
Kisha, W., & Hann, D. (2021). Numerical Optimisation of the Regenerator of a Multi-stage Travelling Wave Thermoacoustic Electricity Generator. In Advances in Heat Transfer and Thermal Engineering: Proceedings of 16th UK Heat Transfer Conference (UKHTC2019) (459-463). https://doi.org/10.1007/978-981-33-4765-6_79

In a travelling wave thermoacoustic engine, the regenerator is the heart of the engine [1], where the thermal interaction between the working gas and the solid material takes place. Unlike the stack in standing wave engine, the regenerator is more of... Read More about Numerical Optimisation of the Regenerator of a Multi-stage Travelling Wave Thermoacoustic Electricity Generator.

Development of a low-cost, electricity-generating Rankine Cycle, alcohol-fuelled cooking stove for rural communities (2018)
Conference Proceeding
Kisha, W., Riley, P. H., & Hann, D. (2018). Development of a low-cost, electricity-generating Rankine Cycle, alcohol-fuelled cooking stove for rural communities. In Proceedings of the Heat Powered Cycles Conference 2018 (350-357)

This article describes a novel design and construction of a helical tube flash boiler that uses a 2kW nominal methylated spirit burner to heat an approximately 2.5m long coil of copper pipe fed by a nominal 8 bar electrically operated solenoid water... Read More about Development of a low-cost, electricity-generating Rankine Cycle, alcohol-fuelled cooking stove for rural communities.

The Influence of Heat Input Ratio on Electrical Power Output of a Dual-Core Travelling-Wave Thermoacoustic Engine (2018)
Conference Proceeding
Kisha, W., Riley, P. H., Mckechnie, J., & Hann, D. (2018). The Influence of Heat Input Ratio on Electrical Power Output of a Dual-Core Travelling-Wave Thermoacoustic Engine. In HEAT POWERED CYCLES 2018 conference proceedings (67-74)

This paper presents an analytical and experimental investigation of an electricity generator that employs a two-stage looped tube travelling-wave thermoacoustic prime-mover to deliver acoustic power from heat energy, a loudspeaker to extract electric... Read More about The Influence of Heat Input Ratio on Electrical Power Output of a Dual-Core Travelling-Wave Thermoacoustic Engine.

Experimental investigation of oil shedding from an aero-engine ball bearing at moderate speeds (2017)
Conference Proceeding
Santhosh, R., Hee, J. L., Simmons, K., Johnson, G., Hann, D., & Walsh, M. (2017). Experimental investigation of oil shedding from an aero-engine ball bearing at moderate speeds. In Proceedings of ASME Turbo Expo 2017 : Turbomachinery Technical Conference and Exposition. https://doi.org/10.1115/GT2017-63815

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 (2017)
Conference Proceeding
Hee, J. L., Santhosh, R., Simmons, K., Johnson, G., Hann, D., & Walsh, M. (2017). Oil film thickness measurements on surfaces close to an aeroengine ball bearing using optical techniques. In Proceedings of ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. https://doi.org/10.1115/GT2017-63813

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 droplet impingement upon moving films using high speed video and thermal imaging (2015)
Conference Proceeding
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.

A power electronic controlled dump load with negligible harmonics for accurate loading used in testing small wind turbines
Conference Proceeding
Klumpner, C., Al, B., & Hann, D. B. (in press). A power electronic controlled dump load with negligible harmonics for accurate loading used in testing small wind turbines. In 2010 IEEE International Symposium on Industrial Electronics. https://doi.org/10.1109/ISIE.2010.5637240

Permanent magnet synchronous generators (PMSG) are at the core of small scale wind power generators manufactured by a wide range of manufacturers in different configurations: vertical or horizontal axis blades, with various geometries and aerodynamic... Read More about A power electronic controlled dump load with negligible harmonics for accurate loading used in testing small wind turbines.