Search Results

Modern advanced engines are expected to operate with higher combustor temperature rise and lower emissions. These development trends result in more combustor design difficulties. High temperature rise requires more air for complete combustion, hence reducing the amount of cooling air. Emissions consist of CO₂, UHC, NOx, smoke and water vapor. CO₂ is an unavoidable emission of combustion reaction, whereas emissions of NOx mainly depend on temperature. A lean primary zone design is required to achieve low NOx emission. Reverse flow combustors have more difficulties because of the presence of turn section which does not exist in other combustor configurations. There are many studies in public domain which talk about design of combustors. But none of them gives detailed guide on designing reverse flow combustor. The objective of this paper is to provide a reverse flow combustor design procedure, with emissions and performance analysis.

Significant development in the gas turbine technology has brought about an increase in the performance requirements for modern engines. This has generated a significant interest in researching into implementation of novel technologies for various engine components, which will allow for the design of engines to match the new performance requirements. One such technology is the use of hybrid diffusers in gas turbine combustors against conventional combustors like dump diffusers. The hybrid diffuser concept has been around for a while and has the potential of giving a greater performance than conventional diffusers. However, due to limited information available in the public domain, not much has been fully understood about the mechanism of the hybrid diffuser concept. Much of the previous work done on hybrid diffusers are done on designs having a vortex chamber bleed, based on the belief that vortex chambers helps to stabilize the flow separation.