Dynamic Modeling of High Bypass Ratio Turbofan Engines

Abstract

The models described in this paper were constructed and tested as part of the wind-tunnel flutter test program for the Lockheed L-1011 Tri-Jet. This paper is presented to show the methods used to simulate the complex structure of a large turbofan engine and to present data from the calibration and test of the models which will support the conclusion that a successful simulation was accomplished. Design of the models parallels that of the full-scale Rolls-Royce RB.211 engine as closely as possible in order to permit the study of a wide range of failed and unfailed conditions. Several design compromises were necessary, however, and these and their solutions are noted. The resultant engine models proved to be very durable, undergoing over 200 hr of testing without a failure.