The Design and Performance of Axially Symmetrical Contoured Wall Diffusers Employing Suction Boundary Layer Control

Nelson, C. D.; Yang, Tah-teh; Hudson, W. G.

doi:10.1115/1.3445891

Cited by 3 publications

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“…The Stanitz solution has been extended to the axisymmetric potential flow by Nelson et al 2 Such solutions are based on the treatment of the potential and stream functions, therefore they are confined to the two-dimensional or axisymmetric potential flows.…”

Section: Introductionmentioning

confidence: 99%

Time-Dependent Method to Solve the Inverse Problem for Internal Flows

Zannetti

1980

AIAA Journal

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The objective of this paper is a numerical method for designing ducts with arbitrary prescribed pressure distribution at the walls. The method applies to inviscid compressible subsonic or transonic, two-dimensional or axisymmetric flows, and it is based on the time-dependent technique. The walls where the pressure distribution is prescribed are considered as flexible and impermeable. Starting from some initial guessed configuration, the computation follows the transient which occurs while the flexible walls move and finally reach a steady shape. Several numerical examples are described and compared with the solution of the direct problem in the case rff two-dimensional and axisymmetric subsonic diffusers, transonic nozzles and elbows. Nomenclature a = speed of sound b y c = see Fig. 1 c v = constant volume specific heat / = length p = pressure q = velocity u, w,u,w = velocity components (see Fig. 2) t = time x,z = rectangular coordinates P = logarithm of pressure R = gas constant S = entropy T. = temperature X,Z,r = transformed coordinates 7 = specific heats ratio 8 = angle in the polar frame of reference <£ = see Fig. 2 \l/ = stream function All quantities are normalized with respect to reference values: / ref ,/? ref , r ref , tf ref = V*r ref , t rcf = (l ref /q nf ), S ref = c v .

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Section: Introductionmentioning

confidence: 99%

Time-Dependent Method to Solve the Inverse Problem for Internal Flows

Zannetti

1980

AIAA Journal

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“…Yang and co-workers (Nelson et al, 1975 andYang, 1977) presented an inverse calculation procedure for ASME affiliation: 1-Student member, 2-Associate member, 3-Fellow incompressible, irrotational flows in axisymmetric circular and annular passages. The governing equations were transformed into a coordinate system where the velocity potential function and stream function were the independent variables.…”

Section: Introductionmentioning

confidence: 99%

Use of Subdomains for Inverse Problems in Branching Flow Passages

Krishnan

Agrawal

Yang

1992

Volume 1: Turbomachinery

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For inverse problems in complex flow passages, a calculation procedure based on multizone Navier-Stokes method was developed. A heuristic approach was employed to derive wall shape corrections from the wall pressure error. Only two subdomains sharing a row of control volumes were used in the present work. The grid work in the common region was identical for both subdomains. The flow solver, inverse calculation procedure, multizone Navier-Stokes method and subdomain inverse calculation procedure were validated independently against experimental data or numerical predictions. The subdomain inverse calculation method was applied to determine the wall shape of the main duct of a branching flow passage. This main duct was to minimize the pressure gradient downstream of the sidebranch. Inverse calculations resulted in a range of wall shapes with wall pressure distribution approaching the design (prescribed) wall pressure distribution. The present approach was illustrated for laminar, incompressible flows in branching passages. However, the method presented is flexible and can be extended for inverse turbulent flow calculations in multiply connected domains.

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Design of Branched and Unbranched Axially Symmetrical Ducts with Specified Pressure Distribution

Nelson

Yang

1977

AIAA Journal

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The Design and Performance of Axially Symmetrical Contoured Wall Diffusers Employing Suction Boundary Layer Control

Cited by 3 publications

References 0 publications

Time-Dependent Method to Solve the Inverse Problem for Internal Flows

Time-Dependent Method to Solve the Inverse Problem for Internal Flows

Use of Subdomains for Inverse Problems in Branching Flow Passages

Design of Branched and Unbranched Axially Symmetrical Ducts with Specified Pressure Distribution

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