NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Progress on Variable Cycle EnginesProgress in the development and future requirements of the Variable Stream Control Engine (VSCE) are presented. The two most critical components of this advanced system for future supersonic transports, the high performance duct burner for thrust augmentation, and the low jet coannular nozzle were studied. Nozzle model tests substantiated the jet noise benefit associated with the unique velocity profile possible with a coannular nozzle system on a VSCE. Additional nozzle model performance tests have established high thrust efficiency levels only at takeoff and supersonic cruise for this nozzle system. An experimental program involving both isolated component and complete engine tests has been conducted for the high performance, low emissions duct burner with good results and large scale testing of these two components is being conducted using a F100 engine as the testbed for simulating the VSCE. Future work includes application of computer programs for supersonic flow fields to coannular nozzle geometries, further experimental testing with the duct burner segment rig, and the use of the Variable Cycle Engine (VCE) Testbed Program for evaluating the VSCE duct burner and coannular nozzle technologies.
Document ID
19790056746
Document Type
Conference Paper
Authors
Westmoreland, J. S. (Pratt and Whitney Aircraft Group East Hartford, CT, United States)
Howlett, R. A. (Pratt and Whitney Aircraft Group East Hartford, CT, United States)
Lohmann, R. P. (United Technologies Corp. Pratt and Whitney Aircraft Group, East Hartford, Conn., United States)
Date Acquired
August 9, 2013
Publication Date
June 1, 1979
Subject Category
AIRCRAFT PROPULSION AND POWER
Report/Patent Number
AIAA PAPER 79-1312
Meeting Information
AIAA, SAE, and ASME, Joint Propulsion Conference(Las Vegas, NV)
Funding Number(s)
CONTRACT_GRANT: NAS3-20061
CONTRACT_GRANT: NAS3-20602
CONTRACT_GRANT: NAS3-20048
Distribution Limits
Public
Copyright
Other