The pollutant and noise emissions as well as the fuel consumption of jet engines for the civil aviation have to be significantly reduced in the future. The following concepts are being pursued:
1- Increasing the thermal efficiency of the process by increasing the pressure ratio and the turbine inlet temperature
2- Increasing the propulsion efficiency by a higher by-pass ratio
3- Lean combustion concept
In this context, the short helical combustor (SHC) has been proposed.
The SHC is an innovative concept for a gas turbine combustor. The idea is to utilize the angular momentum of the flow from the compressor in the combustor and subsequently in the turbine. Hence, the axes of the burners of the SHC are not parallel to the rotational axis of the machine. They are tilted in the circumferential direction and arranged in a helical and staggered configuration. The SHC concept allows a reduction of the axial length, and therefore enables a better integration of the combustion chamber in to the engine. This is advantageous regarding the rotor dynamics as well as the engine weight. Furthermore, the Outlet Guide Vanes (OGV) and the Nozzle Guide Vanes (NGV) can be designed with a lower deflection angle so that the number of vanes may be reduced. ... mehr