Stator Diffusion Enhancement Using a Re-Circulating Co-Flowing Steady Jet (Postprint)
AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH FAN AND COMPRESSOR BRANCH
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This paper outlines a steady flow control technique that augments the diffusion process within a stator passage via a continuous co-flowing secondary flow stream along the suction surface. The technique is similar to that used for flow vectoring in nozzles where a secondary flow stream is used to enhance the diffusion and vectoring of high speed jets. Diffusion factors in excess of 0.95 are simulated and the penalty for the secondary system is addressed with an availability and simple power analysis. Losses within the secondary flow stream were included in the availability analysis, but it did not account for losses within a delivery system of this secondary flow. This was accomplished through the 1D power analysis which assessed this techniques impact on the efficiency of an axial compression stage and the sensitivity of this efficiency to the secondary flow systems efficiency. A system level analysis is presented to assess the specific fuel consumption and thrust-to-weight merits that may be realized in a notional engine with this type of flow control. A cascade experiment was also performed to demonstrate the concept in a blow-down cascade tunnel.
- Hydraulic and Pneumatic Equipment
- Fluid Mechanics