Abstract
The paper reports numerical studies carried out on an aggressive turbine exhaust delivery system. A typical industrial turbine exhaust system has been used as the baseline configuration. Several geometry modifications of the diffuser system were attempted to study their effect on the diffuser performance. The geometrical modifications used were 1) Blended shapes — a blended strut-hub geometry; 2) Repositioning of the struts; and 3) contoured hub end. The performance of the diffusers has been quantified in terms of total pressure loss and static pressure rise coefficient across the diffuser. The last stage turbine tip leakage flow has been simulated by using annular casing injectors applied ahead of annular diffuser. The effect of varying the rate of injection has also been analyzed. In addition, the effect of shortening the length of the diffuser was studied. Modification-2, as stated above, has been applied on the shortened aggressive diffuser and it was observed that with injection the performance of shortened aggressive diffuser is better than that of the baseline configuration.
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