FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2169088827> ?p ?o ?g. }

• W2169088827 abstract "The report Efficiency Centrifugal Compressor for Rotorcraft Applications documents the work conducted at UTRC under the NRA Contract NNC08CB03C, with cost share 2/3 NASA, and 1/3 UTRC, that has been extended to 4.5 years. The purpose of this effort was to identify key technical barriers to advancing the state-of-the-art of small centrifugal compressor stages; to delineate the measurements required to provide insight into the flow physics of the technical barriers; to design, fabricate, install, and test a state-of-the-art research compressor that is representative of the rear stage of an axial-centrifugal aero-engine; and to acquire detailed aerodynamic performance and research quality data to clarify flow physics and to establish detailed data sets for future application. The design activity centered on meeting the goal set outlined in the NASA solicitation-the design target was to increase efficiency at higher work factor, while also reducing the maximum diameter of the stage. To fit within the existing Small Engine Components Test Facility at NASA Glenn Research Center (GRC) and to facilitate component re-use, certain key design parameters were fixed by UTRC, including impeller tip diameter, impeller rotational speed, and impeller inlet hub and shroud radii. This report describes the design effort of the High Efficiency Centrifugal Compressor stage (HECC) and delineation of measurements, fabrication of the compressor, and the initial tests that were performed. A new High-Efficiency Centrifugal Compressor stage with a very challenging reduction in radius ratio was successfully designed, fabricated and installed at GRC. The testing was successful, with no mechanical problems and the running clearances were achieved without impeller rubs. Overall, measured pressure ratio of 4.68, work factor of 0.81, and at design exit corrected flow rate of 3 lbm/s met the target requirements. Polytropic efficiency of 85.5 percent and stall margin of 7.5 percent were measured at design flow rate and speed. The measured efficiency and stall margin were lower than pre-test CFD predictions by 2.4 percentage points (pt) and 4.5 pt, respectively. Initial impressions from the experimental data indicated that the loss in the efficiency and stall margin can be attributed to a design shortfall in the impeller. However, detailed investigation of experimental data and post-test CFD simulations of higher fidelity than pre-test CFD, and in particular the unsteady CFD simulations and the assessment with a wider range of turbulence models, have indicated that the loss in efficiency is most likely due to the impact of unfavorable unsteady impeller/diffuser interactions induced by diffuser vanes, an impeller/diffuser corrected flow-rate mismatch (and associated incidence levels), and, potentially, flow separation in the radial-to-axial bend. An experimental program with a vaneless diffuser is recommended to evaluate this observation. A subsequent redesign of the diffuser (and the radial-to-axial bend) is also recommended. The diffuser needs to be redesigned to eliminate the mismatching of the impeller and the diffuser, targeting a slightly higher flow capacity. Furthermore, diffuser vanes need to be adjusted to align the incidence angles, to optimize the splitter vane location (both radially and circumferentially), and to minimize the unsteady interactions with the impeller. The radial-to-axial bend needs to be redesigned to eliminate, or at least minimize, the flow separation at the inner wall, and its impact on the flow in the diffuser upstream. Lessons were also learned in terms of CFD methodology and the importance of unsteady CFD simulations for centrifugal compressors was highlighted. Inconsistencies in the implementation of a widely used two-equation turbulence model were identified and corrections are recommended. It was also observed that unsteady simulations for centrifugal compressors require significantly longer integration times than what is current practice in industry." @default.
• W2169088827 created "2016-06-24" @default.
• W2169088827 creator A5001183060 @default.
• W2169088827 creator A5009817941 @default.
• W2169088827 creator A5026287846 @default.
• W2169088827 creator A5042245592 @default.
• W2169088827 creator A5042460642 @default.
• W2169088827 creator A5046054003 @default.
• W2169088827 creator A5048459239 @default.
• W2169088827 creator A5059272774 @default.
• W2169088827 creator A5068695454 @default.
• W2169088827 creator A5079994412 @default.
• W2169088827 date "2014-11-01" @default.
• W2169088827 modified "2023-09-27" @default.
• W2169088827 title "High Efficiency Centrifugal Compressor for Rotorcraft Applications" @default.
• W2169088827 hasPublicationYear "2014" @default.
• W2169088827 type Work @default.
• W2169088827 sameAs 2169088827 @default.
• W2169088827 citedByCount "1" @default.
• W2169088827 countsByYear W21690888272015 @default.
• W2169088827 crossrefType "journal-article" @default.
• W2169088827 hasAuthorship W2169088827A5001183060 @default.
• W2169088827 hasAuthorship W2169088827A5009817941 @default.
• W2169088827 hasAuthorship W2169088827A5026287846 @default.
• W2169088827 hasAuthorship W2169088827A5042245592 @default.
• W2169088827 hasAuthorship W2169088827A5042460642 @default.
• W2169088827 hasAuthorship W2169088827A5046054003 @default.
• W2169088827 hasAuthorship W2169088827A5048459239 @default.
• W2169088827 hasAuthorship W2169088827A5059272774 @default.
• W2169088827 hasAuthorship W2169088827A5068695454 @default.
• W2169088827 hasAuthorship W2169088827A5079994412 @default.
• W2169088827 hasConcept C127413603 @default.
• W2169088827 hasConcept C131097465 @default.
• W2169088827 hasConcept C13393347 @default.
• W2169088827 hasConcept C146978453 @default.
• W2169088827 hasConcept C153005164 @default.
• W2169088827 hasConcept C171146098 @default.
• W2169088827 hasConcept C180788929 @default.
• W2169088827 hasConcept C21541133 @default.
• W2169088827 hasConcept C2777096023 @default.
• W2169088827 hasConcept C78519656 @default.
• W2169088827 hasConcept C95277225 @default.
• W2169088827 hasConceptScore W2169088827C127413603 @default.
• W2169088827 hasConceptScore W2169088827C131097465 @default.
• W2169088827 hasConceptScore W2169088827C13393347 @default.
• W2169088827 hasConceptScore W2169088827C146978453 @default.
• W2169088827 hasConceptScore W2169088827C153005164 @default.
• W2169088827 hasConceptScore W2169088827C171146098 @default.
• W2169088827 hasConceptScore W2169088827C180788929 @default.
• W2169088827 hasConceptScore W2169088827C21541133 @default.
• W2169088827 hasConceptScore W2169088827C2777096023 @default.
• W2169088827 hasConceptScore W2169088827C78519656 @default.
• W2169088827 hasConceptScore W2169088827C95277225 @default.
• W2169088827 hasLocation W21690888271 @default.
• W2169088827 hasOpenAccess W2169088827 @default.
• W2169088827 hasPrimaryLocation W21690888271 @default.
• W2169088827 hasRelatedWork W1826876105 @default.
• W2169088827 hasRelatedWork W1914182270 @default.
• W2169088827 hasRelatedWork W1988718665 @default.
• W2169088827 hasRelatedWork W2000216346 @default.
• W2169088827 hasRelatedWork W2003308258 @default.
• W2169088827 hasRelatedWork W2033385175 @default.
• W2169088827 hasRelatedWork W2037748882 @default.
• W2169088827 hasRelatedWork W2062386116 @default.
• W2169088827 hasRelatedWork W2071246557 @default.
• W2169088827 hasRelatedWork W2093520756 @default.
• W2169088827 hasRelatedWork W2110059313 @default.
• W2169088827 hasRelatedWork W2153890432 @default.
• W2169088827 hasRelatedWork W2165359267 @default.
• W2169088827 hasRelatedWork W2297907281 @default.
• W2169088827 hasRelatedWork W2324822463 @default.
• W2169088827 hasRelatedWork W2526508785 @default.
• W2169088827 hasRelatedWork W2916444125 @default.
• W2169088827 hasRelatedWork W3200669481 @default.
• W2169088827 hasRelatedWork W1594650802 @default.
• W2169088827 hasRelatedWork W2091851663 @default.
• W2169088827 isParatext "false" @default.
• W2169088827 isRetracted "false" @default.
• W2169088827 magId "2169088827" @default.
• W2169088827 workType "article" @default.