A Novel Hybrid Combustion System for Future Aircraft Engines
10:00 - 10:30
Level 0 lecture hall between Al-Jazri and Al-Kindi (buildings 4 and 5)
The talk discusses briefly the basics of flameless combustion and the main challenges in applying this combustion technique to Gas Turbines and Aero Engines. The hybrid combustion system investigated within the EU sponsored AHEAD project (http://www.ahead-euproject.eu) for a new type of aero engine configuration will be described. The hybrid combustion system consists of two combustion chambers, the first combustion chamber (located between the HPC and HPT) burns cryogenic fuel (such as liquid hydrogen/liquid natural gas) in a vaporized state, whereas, the second combustor is an Inter-stage Turbine Burner (ITB) and uses kerosene/biofuels in the flameless combustion mode. Since the flammability limit for Hydrogen / Methane is wider than kerosene, the combustion in the first combustion chamber can take place at lean conditions and is beneficial from NOx emission perspective. The combustion in the first combustor increases the concentration of water vapour and reduces the O2 concentration within the gases, thereby creating a high temperature vitiated environment at the inlet of the inter turbine burner. This is beneficial to obtain flameless combustion. The salient feature of this novel hybrid engine and the main benefits and challenges of this engine will be described. The main results obtained from the experiments carried out at TU Berlin (by the group of Prof. Paschereit) and Technion (by the group of Prof. Yeshayahou Levy) along with the simulations carried at TU Delft will be presented.