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The University of Southampton
Engineering

Dr Hemdan Shalaby 

Research Fellow

Dr Hemdan Shalaby's photo

Dr Hemdan Shalaby is Research Fellow within Engineering and Physical Sciences at the University of Southampton.

Education

B.Sc. Cairo University, Egypt
M.Sc. Cairo University, Egypt
Ph.D. Technical University of Chemnitz, Germany
Postdoc. University of Magdeburg, Germany

Employment History

Assistant Professor, University of Magdeburg, Germany
Assistant researcher, Institute of Fire protection, Germany

Research interests

  • Fluid Dynamics and Heat transfer with emphasis on complex flows, for example involving chemical reactions
  • Direct Numerical Simulation for fundamental problems and consequences for model development (RANS, LES)
  • Further development and validation of industrial codes for complex configurations
  • Fire science and fire protection engineering
Research project
Tackling combustion instability in low-emission energy systems: Mathematical modelling, numerical simulation and control algorithms

Background
In the past, various aspects of the interaction were modelled in isolation, and often on an empirical basis. Advanced mathematical techniques, matched asymptotic expansion technique and multiple-scale methods, provide a means to tackle this multi-physical phenomenon in a self-consistent and systematical manner. By using this approach, a first-principle flame-acoustic interaction theory, valid in the so-called corrugated flamelet regime, has recently been derived. In this project this new flame-acoustic interaction theory will be extended first to account for the influence of a general externally imposed perturbation. Then a more general asymptotic theory is formulated in the so-called thin-reaction-zone regime. Numerical algorithms to solve the asymptotically reduced systems are also being developed.
The asymptotic theories and numerical methods provide, in principle, an efficient tool for predicting the onset of combustion instability. The fidelity of this approach will be assessed by accurate direct numerical simulations (DNS). It is applied to the situations pertaining to important experiments in order to predict a number of remarkable phenomena, such as self-sustained oscillations, flame stabilization by pressure oscillations, parametric instability induced by pressure and/or enthalpy fluctuations and onset of chaotic flumes. The theoretical models will be employed to develop effective active control of combustion instability by modulating fuel rate, and the effectiveness and robustness of the controllers designed will be tested by simulations using the asymptotic models as well as the fundamental equations for reacting flows.

Research group

Energy Technology

Research project(s)

Tackling combustion instability in low-emission energy systems: mathematical modelling, numerical simulations and control algorithms

Dr Hemdan Shalaby
Engineering, University of Southampton, Highfield, Southampton. SO17 1BJ United Kingdom
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