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An experimental and computational investigation of a translating throat single expansion-ramp nozzleA translating throat single expansion-ramp nozzle (SERN) concept was designed to improve the off-design performance of a SERN with a large, fixed expansion ratio. The concept of translating the nozzle throat provides the SERN with a variable expansion ratio. An experimental and computational study was conducted to predict and verify the internal performance of this concept. Three nozzles with expansion ratios designed for low, intermediate, and high Mach number operating conditions were tested in the Jet-Exit Test Facility at the NASA Langley Research Center. Each nozzle was tested with a concave and a convex geometric expansion ramp surface design. Internal nozzle performance, paint-oil flow and focusing Schlieren flow visualization were obtained for nozzle pressure ratios (NPR's) up to 13. The Navier-Stokes code, PAB3D, with a k-epsilon turbulence model was utilized to verify experimental results at selected NPRs and to predict the performance at conditions unattainable in the test facility. Two-dimensional simulations were computed with near static free-stream conditions and at nozzle pressure ratios of 5, 9, and 13 for the concave ramp, low Mach number configuration and at the design NPR of 102 for the concave ramp, high Mach number configuration. Remarkable similarities between predicted and experimental flow characteristics, as well as performance quantities, were obtained.
Document ID
19960028774
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Deere, Karen A. (NASA Hampton, VA United States)
Asbury, Scott C. (NASA Hampton, VA United States)
Date Acquired
September 6, 2013
Publication Date
July 1, 1996
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
NAS 1.15:111604
NASA-TM-111604
AIAA Paper 96-2540
Meeting Information
Meeting: AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit
Location: Lake Buena Vista, FL
Country: United States
Start Date: July 1, 1996
End Date: July 3, 1996
Sponsors: Society of Automotive Engineers, Inc., American Inst. of Aeronautics and Astronautics, American Society of Mechanical Engineers
Accession Number
96N29434
Distribution Limits
Public
Copyright
Public Use Permitted.

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