Project - ANNULIGhT
The development of next generation low- to zero-emission gas turbines is hindered by unsteady combustion problems that are often only discovered late into development because our scientific understanding is insufficient to predict them at the design stage. For reasons of cost and simplicity, we have been trying to solve these problems by studying them in simpler single flame configurations when, in reality, many gas turbines have annular combustor chambers with multiple flames.
The research focus of ANNULIGhT is to make progress in our scientific understanding to solve these problems by studying them in annular combustor geometries. The main challenges for modern and future low-emission concepts are: i) the occurrence of self-excited combustion instabilities for both aeroengines and power generation gas turbines which take the form of azimuthal modes in annular geometries resulting in large pressure fluctuations threatening structural integrity, ii) increased probability of lean Blow-off, which consequently makes iii) ignition and light-around more difficult. These latter two issues are safety critical for aeroengine certification yet very little is understood about the mechanisms which control these processes.
The research methodology of ANNULIGhT is shown by the schematic below: