Abstract
Abstract : Pratt and Whitney Aircraft large and small engine main shaft bearings and seals were reviewed (1) to identify large gas turbine engine bearing and seal concepts or characteristics which are applicable to small gas turbine engines of the 2-10 lb/sec airflow size, (2) to define large engine bearing and seal design standards for applicability to small gas turbine engines, (3) to determine suitable factors for scaling bearing and seal technology concepts from large gas turbine engines to small, 2-10 lb/sec airflow size turbine engines, (4) to recommend test programs to provide scaling data where scale factors are questionable, and (5) to determine what bearing and seal technology is lacking for advanced small engines. To accomplish this task, bearing and seal characteristics that might define standard design practices or scale factors were selected. After collection and compilation of pertinent data, comparisons were made to establish relationships between engine size and selected bearing and seal characteristics. In addition, comparisons of selected characteristics of large, mostly twin-spool engines versus small engine bearing, seal, and rotor dynamic characteristics were made.
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