NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Aerodynamic Shape Optimization of a Dual-Stream Supersonic Plug NozzleAerodynamic shape optimization was performed on an isolated axisymmetric plug nozzle sized for a supersonic business jet. The dual-stream concept was tailored to attenuate nearfield pressure disturbances without compromising nozzle performance. Adjoint-based anisotropic mesh refinement was applied to resolve nearfield compression and expansion features in the baseline viscous grid. Deformed versions of the adapted grid were used for subsequent adjoint-driven shape optimization. For design, a nonlinear gradient-based optimizer was coupled to the discrete adjoint formulation of the Reynolds-averaged Navier- Stokes equations. All nozzle surfaces were parameterized using 3rd order B-spline interpolants and perturbed axisymmetrically via free-form deformation. Geometry deformations were performed using 20 design variables shared between the outer cowl, shroud and centerbody nozzle surfaces. Interior volume grid deformation during design was accomplished using linear elastic mesh morphing. The nozzle optimization was performed at a design cruise speed of Mach 1.6, assuming core and bypass pressure ratios of 6.19 and 3.24, respectively. Ambient flight conditions at design were commensurate with 45,000-ft standard day atmosphere.
Document ID
20150000697
Acquisition Source
Glenn Research Center
Document Type
Conference Paper
Authors
Heath, Christopher M.
(NASA Glenn Research Center Cleveland, OH United States)
Gray, Justin S.
(NASA Glenn Research Center Cleveland, OH United States)
Park, Michael A.
(NASA Langley Research Center Hampton, VA, United States)
Nielsen, Eric J.
(NASA Langley Research Center Hampton, VA, United States)
Carlson, Jan-Renee
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
January 22, 2015
Publication Date
January 5, 2015
Subject Category
Aerodynamics
Aircraft Propulsion And Power
Report/Patent Number
GRC-E-DAA-TN19528
Meeting Information
Meeting: SciTech 2015
Location: Kissimmee, FL
Country: United States
Start Date: January 5, 2015
End Date: January 9, 2015
Sponsors: American Inst. of Aeronautics and Astronautics
Funding Number(s)
WBS: WBS 475122.02.03.02.02
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Keywords
shape optimization
plug nozzles
supersonic jet flow
No Preview Available