Experimental Program for the Evaluation of Turbofan/Turboshaft Conversion Technology

Abstract

A TF34 turbofan engine is being modified to produce shaft power from an output coupling on the fan disk when variable inlet guide vanes are closed to reduce fan airflow. The engine, called a convertible engine, could be used on advanced rotorcraft such as X-wing, ABC (Advancing Blade Concept), and Folding Tilt Rotor, and on V/STOL craft in which two engines are cross-coupled. The engine will be tested on an outdoor static test stand at NASA Lewis Research Center. Steady-state tests will be made to measure performance in turbofan, turboshaft, and combined power output modes. Transient tests will be made to determine the response of the engine and a new digital engine control system for several types of rapid changes in thrust and shaft load. The paper describes the engine modifications, the test facility equipment, proposed testing techniques for several types of tests, and typical test results predicted from engine performance computer programs.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1982
Accession Number
ADA233790

Entities

People

  • J. G. Mcardle
  • L. M. Wenzel

Organizations

  • National Aeronautics and Space Administration

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Actuators
  • Aircrafts
  • Computer Programs
  • Computers
  • Control Systems
  • Generators
  • Guide Vanes
  • Inlet Guide Vanes
  • Measurement
  • Propulsion Systems
  • Rotary Wing Aircraft
  • Short Takeoff Aircraft
  • Static Tests
  • Test Equipment
  • Test Stands
  • Tilt Rotor Aircraft
  • Turbofan Engines

Fields of Study

  • Physics

Readers

  • Aerospace Engineering
  • Aerospace Test and Evaluation