GENERALIZATION OF TURBOJET AND TURBINE-PROPELLER ENGINE PERFORMANCE IN WINDMILLING CONDITION

摘要

The windmilling characteristics of several turbojet and turbine-propeller engines were investigated individually over a wide range of flight conditions in the NACA Lewis altitude wind tunnel. A study was made of all these data and windmilling performance of gas-turbine engines was generalized.nAlthough the internal-drag, air-flow, and total-pressure-drop parameters were generalized to a single curve for both the axial-flow turbojet engines and the centrifugal-flow turbojet engine investigated, the engine-speed parameter separated into two curves - one for all the axial-flow-type engines and another for the centrifugal-flow engine. The engine speed, component pressure changes, and windmilling-propeller drag were generalized to single curves for the two turbine-propeller-type engines investigated. By the use of these curves the windmilling performance can be estimated for axial-flow-type gas-turbine engines similar to the types investigated over a wide range of flight conditions.