NDLI: Model aerodynamic test results for two variable cycle engine coannular exhaust systems at simulated takeoff and cruise conditions. [lewis 8 by 6-foot supersonic wind tunnel tests

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Model aerodynamic test results for two variable cycle engine coannular exhaust systems at simulated takeoff and cruise conditions. [lewis 8 by 6-foot supersonic wind tunnel tests

Content Provider	NASA Technical Reports Server (NTRS)
Author	Nelson, D. P.
Copyright Year	1980
Description	Wind tunnel tests were conducted to evaluate the aerodynamic performance of a coannular exhaust nozzle for a proposed variable stream control supersonic propulsion system. Tests were conducted with two simulated configurations differing primarily in the fan duct flowpaths: a short flap mechanism for fan stream control with an isentropic contoured flow splitter, and an iris fan nozzle with a conical flow splitter. Both designs feature a translating primary plug and an auxiliary inlet ejector. Tests were conducted at takeoff and simulated cruise conditions. Data were acquired at Mach numbers of 0, 0.36, 0.9, and 2.0 for a wide range of nozzle operating conditions. At simulated supersonic cruise, both configurations demonstrated good performance, comparable to levels assumed in earlier advanced supersonic propulsion studies. However, at subsonic cruise, both configurations exhibited performance that was 6 to 7.5 percent less than the study assumptions. At take off conditions, the iris configuration performance approached the assumed levels, while the short flap design was 4 to 6 percent less.
File Size	3841980
Page Count	70
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19810004546
Archival Resource Key	ark:/13960/t6256f54m
Language	English
Publisher Date	1980-12-17
Access Restriction	Open
Subject Keyword	Aircraft Propulsion And Power Variable Cycle Engines Propulsion System Performance Supersonic Cruise Aircraft Research Annular Nozzles Ejectors Wind Tunnel Tests Wind Tunnel Models Velocity Distribution Takeoff Aerodynamic Characteristics Nozzle Efficiency Exhaust Systems Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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