Apparatus and method for controlling mass flow rate in rotary compressors.

摘要

Two sets of guide vanes (52) and (62) are positioned in the combustion air flow path (54) in the inlet duct (50) of a rotary compressor (10) of a gas turbine engine for controllably varying the air mass flow rate according to turbine load conditions. The upstream set (62) which provides a fixed, initial degree of swirl relative to compressor rotational direction and axis (18) and the controllably moveable downstream set (52) which provides a final degree of swirl cooperate to provide controllable swirl over the range of about 0° to 32° in the inlet air incident upon the compressor blades (16). The two guide vane sets (52) and (62) are separated by a distance sufficient to allow turbulence induced by the first set (62) to fully decay before the second set (52) is encountered.