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Effect of Side Wall Expansion Angle on the Performance of a Model Dump Diffuser for a Combustor
Author(s): CHETAN TEKI BHEEMA VENKATA, S. Chakrabarti
Keywords: Sidewall Angle, Corner recirculation zone, Converging and diverging area, Static pressure recovery, Total pressure loss
In the present article, numerical analysis has been performed on a model dump diffuser, to study the effect of sidewall expansion angle (SWA), on its performance aspects. SWA has been varied from 90° to 1° and performance has been evaluated in terms of major influencing aspects. It is observed that, at SWA of magnitudes greater than 11°, there is no significant change in the performance. But, at SWA below 11°, significant changes, which enhance the performance, are observed. It is noticed that, at SWA in range from 3.57° to 8°, higher static pressure recovery (almost from 25 to 33% of inlet dynamic pressure) happens in the dump and annular regions. SWA of magnitudes less than 11° have resulted in smaller, low dense and higher intense recirculation zones. At an SWA of 3.57°, static pressure recovery is maximum and total pressure loss is minimum. But that SWA causes too much delay in pressure stabilization on the liner wall. However, SWA of magnitudes less than 3.57° have resulted in comparatively poor performance. Eventually, sidewall angle in the range from 5° to 7° is found to be optimum, as it yields higher static pressure recovery and low total pressure loss. This range also results in early stabilization of pressure both on the liner and casing walls.