Investigation of Feasibility of Integral Gas Turbine Engine Solid Particle Inlet Separators. Phase II. Feasibility Demonstration.

摘要

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 8lb/sec 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 2.8in. 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 8lb/sec,it demonstrated a maximum separation efficiency of 58.7% with 8.4% scavenge flow and an average pressure rise of 6.76psi. 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. (Author)