Investigation of Feasibility of Integral Gas Turbine Engine Solid Particle Inlet Separators. Phase II. Feasibility Demonstration
PRATT AND WHITNEY AIRCRAFT WEST PALM BEACH FL FLORIDA RESEARCH AND DEVELOPMENT CENTER
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Two different sand and dust particle separator test rigs were fabricated and tested to evaluate separation efficiency, aerodynamic performance characteristics, and operation in rain and foliage ingestion conditions. The semi-reverse-flow separator utilized fixed turning vanes on a contoured hub to induce swirl in an annular duct. At design airflow of 8 lbsec and 40 scavenge flow, the semi-reverse-flow separator demonstrated 88.5 separation efficiency with AC coarse test dust at an average pressure drop of 2.8 in. H2O. The powered mixed-flow separator attempted to utilize the strong centrifugal field available in a mixed-flow impeller turning at the high speeds characteristic of small gas turbine engines to achieve particle separation. At the design airflow of 8 lb sec, it demonstrated a maximum separation efficiency of 58.7 with 8.4 scavenge flow and an average pressure rise of 6.76 psi. Both separator concepts were determined to be feasible and the semi-reverse-flow separator is considered to be superior to current engine air particle separators for the majority of aspects investigated.
- Jet and Gas Turbine Engines