Abstract
In the present numerical study, flow characteristics of an aggressive inter-turbine duct under design and off-design inflow conditions, are reported. Two duct geometries (1) un-strutted and (2) strutted are considered. An un-strutted duct with sector angle of 20 and a strutted duct with 40 sector angle are analyzed. The performance of the duct is evaluated using static pressure recovery and total pressure loss. For simulating off design conditions, the duct inlet boundary is imposed with a typical tip leakage profile (reminiscent of the exit flow from the preceding high pressure turbine stage) and swirl. The swirl is varied between 10 to 30. Under off-design conditions, the un-strutted duct shows only marginal deviation in its performance. However, the strutted duct showed a significant increase in loss under off-design conditions.
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