On-line stall margin adjustment in a gas turbine engine

摘要

The deflection angle of a gas turbine stator is adjusted in proportion to the difference between two parameters computed from N2 and TT2 using the same function generator. One parameter is a reference adjustment under standard conditions for measured N2 adjusted to sea level and standard temperature. The second parameter is an adjustment for actual altitude conditions. The parameters manifest the clearance between the engine case and the turbine blade tips.