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Naser Sayma
Professor in Computational Fluid Dynamics (Design Solutions for Climate Change)

Research

H2-IGCC: Low Emission Gas Turbine Technology for Hydrogen-rich Syngas (November 2009-October 2013)  

The overall objective of the H2-IGCC project is to provide and demonstrate technical solutions which will allow the use of state-of-the-art highly efficient, reliable gas turbines (GTs) in the next generation of Integrated Gasification Combined Cycle (IGCC) plants. The goal is to enable combustion of undiluted hydrogen-rich syngas with low NOx emissions and also allowing for high fuel flexibility. The challenge is to operate a stable and controllable GT on hydrogen-rich syngas with emissions and processes similar to current state-of-the-art natural GT engines. The H2-IGCC project aims to tackle this challenge as well as fuel flexibility, by enabling the burning of back-up fuels, such as natural gas, without adversely affecting the reliability and availability.

The project is coordinated by the European Turbine Network (ETN)() and includes 23 partners from industry and research ogranisations. The Â鶹´«Ã½ÉçÇøÈë¿Ú is leading the Turbomachiney sub-project which aims at modyfying the design of the compressor and turbine to ensure maximum efficiency during syngas operation while allowing fuel flexibility.

Project Team at Sussex:

Pascal Nucara, Adrian Romocia and Eleni Ionaou

Publications:

Nucara, P and Sayma, A. I.: Effects of using Hydrogen-rich syngas in Industrial gas turbines while maintaining fuel flexibility on compressor design, ASME turbo expo 2011, GT2011-45589, Vancouver, Canada, June 2011.

Nucara, P and Sayma, A. I.: Effecs of using Hydrogen-rich syngas in industrial gas turbines while maintaining fuel flexibility on a multistage axial compressor design, ASME turbo expo 2012 Compehagen, GT2011-69780

Unsteady Aerodynamics:

Numerical Simulations of Compressor rotating stall:

PhD student: Yanling Li: October 2009-September 2012

Project objectives: To understand the mechanisms of rotating stall and the effect of compressor performance of damaged compressor blades and malscheduled variable stator vanes.

Pubications

Yanling Li and Abdulnaser Sayma, 2012, "Effect of blade damage on the performance of a transonic axial compressor rotor", ASME Turbo Expo 2012, Copenhgen GT2012-68324.

Suistainable Energy Technology: Waste heat recovery using Organic Rankine Cycle (October 2011-April 2015)

This project is funded by the Engineering and Phyisical Sciences Research Council (EPSRC) and suppoted by industry. The aim of the project is to develop the enabling technology to allow the feadible operation of small scale (Under 25kWe) waste heat recovery units.

Prject team: Mark Puttock and Martin White

Current work is focusing on cycle optimisation and the development and testing of a suitable expander.

Numerical Investigation of Bolt Windage in gas turbine rotor-stator cavities: (2010-2015)

The Â鶹´«Ã½ÉçÇøÈë¿Ú has a gas-turbine engine represetative test rig which has been used to investigate the effect of rotor and stator mounted bolts on gas turbine disks on the flow structure, increased windage and flow heating. In this project, Computational Fluid Dynamics (CFD) tools are used to extend the understanding of the phenomena involved. The CFD is validated using experimental data obtained at Sussex.

PhD student: Elham Roshani Moghadam

Publications:

Roshani, E, Coren, D, Long, C. L. And Sayma, A. I. : A numerical investigation of rotor bolt windage within a rotor-stator cavity. ASME turbo expo 2011, GT2011-45588, Vancouver, Canada, June 2011.