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

Nelson, C. D.; Yang, Tah-teh

doi:10.2514/3.60784

Cited by 10 publications

(3 citation statements)

References 6 publications

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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%

“…With this approach, an inverse flow problem is solved by repeatedly using a direct flow solver to refine a guess geometry until the prescribed flow conditions are reached. Ntone and Yang (1986) used a Navier-Stokes solver simplified by the thin-layer approximation to design axisymmetric passages. The wall geometry was modified from two guess wall geometries and their wall pressure distributions.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

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 well-defined potential cores Yang and coworkers (Nelson et al, 1975 andYang, 1977) used an inverse solution method to design axisymmetric curved wall diffusers. Excellent correlations between computed and measured flow fields were obtained.…”

Section: Introductionmentioning

confidence: 99%

Viscous Flow Computations for Compressor/Combustor Diffuser Design to Allow Air Extraction for IGCC Systems

Agrawal

Yang

1991

Volume 3: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations

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A computational procedure based on the solution of fully elliptic Navier-Stokes equations on a body-fitted non-orthogonal grid was used to obtain flow fields in annular diffusers with a suction slot at the inner and outer walls. The turbulence effects were simulated by high Reynolds number form of the k-ε model. The calculation method was used to modify an industrial gas turbine (GE MS · 7001F) compressor/combustor annular diffuser to allow extraction of compressed airflow for coal gasification in simplified IGCC Systems. The air for gasification was extracted through a suction slot on the outer wall of the diffuser which was curved to improve the overall performance and to avoid flow separation; both of these insured by providing accelerated flow through the suction slot and nearly constant wall pressure downstream of the slot. Suction slot and outer wall geometries to result in the above conditions were determined by a trial and error procedure. The diffuser’s performance was further improved by extracting 6% of the compressed air through a slot at the inner wall, kept straight due to structural constraints. The resulting diffuser arrangement was relatively insensitive to the upstream disturbances.

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