FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W1963977918> ?p ?o ?g. }

• W1963977918 endingPage "644" @default.
• W1963977918 startingPage "632" @default.
• W1963977918 abstract "Experimental measurements of skin friction cf and heat transfer (St) augmentation are reported for low speed flow over turbine roughness models. The models were scaled from surface measurements taken on actual, in-service land-based turbine hardware. Model scaling factors ranged from 25 to 63, preserving the roughness height to boundary layer momentum thickness ratio for each case. The roughness models include samples of deposits, TBC spallation, erosion, and pitting. Measurements were made in a zero pressure gradient turbulent boundary layer at two Reynolds numbers (Rex=500,000 and 900,000) and three freestream turbulence levels (Tu=1%, 5%, and 11%). Measurements at low freestream turbulence indicate augmentation factors ranging from 1.1–1.5 for St/Sto and from 1.3–3.0 for cf/cfo(Sto and cfo are smooth plate values). For the range of roughness studied (average roughness height, k, less than 1/3rd the boundary layer thickness) the level of cf augmentation agrees well with accepted equivalent sandgrain ks correlations when ks is determined from a roughness shape/density parameter. This finding is not repeated with heat transfer, in which case the ks-based St correlations overpredict the measurements. Both cf and St correlations severely underpredict the effect of roughness for k+<70 (when ks, as determined by the roughness shape/density parameter, is small). A new ks correlation based on the rms surface slope angle overcomes this limitation. Comparison of data from real roughness and simulated (ordered cones or hemispheres) roughness suggests that simulated roughness is fundamentally different from real roughness. Specifically, ks values that correlate cf for both simulated and real roughness are found to correlate St for simulated roughness but overpredict St for real roughness. These findings expose limitations in the traditional equivalent sandgrain roughness model and the common use of ordered arrays of roughness elements to simulate real roughness surfaces. The elevated freestream turbulence levels produce augmentation ratios of 1.24 and 1.5 St/Sto and 1.07 and 1.16 cf/cfo compared to the Tu=1% flow over the smooth reference plate. The combined effects of roughness and elevated freestream turbulence are greater than their added effects suggesting that some synergy occurs between the two mechanisms. Specifically, skin friction augmentation for combined turbulence and roughness is up to 20% greater than that estimated by adding their separate effects and 8% greater than compounding (multiplying) their separate effects. For heat transfer augmentation, the combined effect of turbulence and roughness is 5% higher than that estimated by compounding their separate effects at high freestream turbulence (Tu=11%). At low turbulence (Tu=5%), there is a negative synergy between the two augmentation mechanisms as the combined effect is now 13% lower than that estimated by compounding their separate effects." @default.
• W1963977918 created "2016-06-24" @default.
• W1963977918 creator A5054191773 @default.
• W1963977918 date "2002-10-01" @default.
• W1963977918 modified "2023-10-01" @default.
• W1963977918 title "St and cf Augmentation for Real Turbine Roughness With Elevated Freestream Turbulence" @default.
• W1963977918 cites W1969359969 @default.
• W1963977918 cites W1972386810 @default.
• W1963977918 cites W1991111367 @default.
• W1963977918 cites W1997320080 @default.
• W1963977918 cites W2016304414 @default.
• W1963977918 cites W2023493305 @default.
• W1963977918 cites W2036257892 @default.
• W1963977918 cites W2037300384 @default.
• W1963977918 cites W2040257635 @default.
• W1963977918 cites W2041998659 @default.
• W1963977918 cites W2055815917 @default.
• W1963977918 cites W2061753491 @default.
• W1963977918 cites W2070041665 @default.
• W1963977918 cites W2076031849 @default.
• W1963977918 cites W2076990912 @default.
• W1963977918 cites W2084495967 @default.
• W1963977918 cites W2101596428 @default.
• W1963977918 cites W2115806270 @default.
• W1963977918 cites W2116631571 @default.
• W1963977918 cites W2131333060 @default.
• W1963977918 cites W2139497748 @default.
• W1963977918 cites W2154404795 @default.
• W1963977918 cites W2159928057 @default.
• W1963977918 cites W2161818907 @default.
• W1963977918 cites W3135412057 @default.
• W1963977918 cites W4234538385 @default.
• W1963977918 cites W4236588158 @default.
• W1963977918 cites W4240856033 @default.
• W1963977918 cites W4243401881 @default.
• W1963977918 cites W4255209901 @default.
• W1963977918 doi "https://doi.org/10.1115/1.1505851" @default.
• W1963977918 hasPublicationYear "2002" @default.
• W1963977918 type Work @default.
• W1963977918 sameAs 1963977918 @default.
• W1963977918 citedByCount "106" @default.
• W1963977918 countsByYear W19639779182012 @default.
• W1963977918 countsByYear W19639779182013 @default.
• W1963977918 countsByYear W19639779182014 @default.
• W1963977918 countsByYear W19639779182015 @default.
• W1963977918 countsByYear W19639779182016 @default.
• W1963977918 countsByYear W19639779182017 @default.
• W1963977918 countsByYear W19639779182018 @default.
• W1963977918 countsByYear W19639779182019 @default.
• W1963977918 countsByYear W19639779182020 @default.
• W1963977918 countsByYear W19639779182021 @default.
• W1963977918 countsByYear W19639779182022 @default.
• W1963977918 countsByYear W19639779182023 @default.
• W1963977918 crossrefType "journal-article" @default.
• W1963977918 hasAuthorship W1963977918A5054191773 @default.
• W1963977918 hasConcept C107365816 @default.
• W1963977918 hasConcept C111603439 @default.
• W1963977918 hasConcept C120618610 @default.
• W1963977918 hasConcept C121332964 @default.
• W1963977918 hasConcept C154718420 @default.
• W1963977918 hasConcept C159985019 @default.
• W1963977918 hasConcept C182748727 @default.
• W1963977918 hasConcept C192562407 @default.
• W1963977918 hasConcept C196558001 @default.
• W1963977918 hasConcept C20381859 @default.
• W1963977918 hasConcept C2776911258 @default.
• W1963977918 hasConcept C2778449969 @default.
• W1963977918 hasConcept C57879066 @default.
• W1963977918 hasConcept C71039073 @default.
• W1963977918 hasConcept C97355855 @default.
• W1963977918 hasConceptScore W1963977918C107365816 @default.
• W1963977918 hasConceptScore W1963977918C111603439 @default.
• W1963977918 hasConceptScore W1963977918C120618610 @default.
• W1963977918 hasConceptScore W1963977918C121332964 @default.
• W1963977918 hasConceptScore W1963977918C154718420 @default.
• W1963977918 hasConceptScore W1963977918C159985019 @default.
• W1963977918 hasConceptScore W1963977918C182748727 @default.
• W1963977918 hasConceptScore W1963977918C192562407 @default.
• W1963977918 hasConceptScore W1963977918C196558001 @default.
• W1963977918 hasConceptScore W1963977918C20381859 @default.
• W1963977918 hasConceptScore W1963977918C2776911258 @default.
• W1963977918 hasConceptScore W1963977918C2778449969 @default.
• W1963977918 hasConceptScore W1963977918C57879066 @default.
• W1963977918 hasConceptScore W1963977918C71039073 @default.
• W1963977918 hasConceptScore W1963977918C97355855 @default.
• W1963977918 hasIssue "4" @default.
• W1963977918 hasLocation W19639779181 @default.
• W1963977918 hasOpenAccess W1963977918 @default.
• W1963977918 hasPrimaryLocation W19639779181 @default.
• W1963977918 hasRelatedWork W189443495 @default.
• W1963977918 hasRelatedWork W1963977918 @default.
• W1963977918 hasRelatedWork W1970252959 @default.
• W1963977918 hasRelatedWork W2009747190 @default.
• W1963977918 hasRelatedWork W2048385563 @default.
• W1963977918 hasRelatedWork W2058977516 @default.
• W1963977918 hasRelatedWork W2083251292 @default.
• W1963977918 hasRelatedWork W2089617007 @default.
• W1963977918 hasRelatedWork W2745529319 @default.

• next