Show simple item record

dc.contributor.advisorNelson, Douglas J.en_US
dc.contributor.advisorDancey, Clinton L.en_US
dc.contributor.advisorNg, Wing Faien_US
dc.contributor.authorChu, Teik Linen_US
dc.date.accessioned2011-08-06T16:06:15Z
dc.date.available2011-08-06T16:06:15Z
dc.date.issued1997-04-15en_US
dc.identifier.otheretd-042399-112737en_US
dc.identifier.urihttp://hdl.handle.net/10919/10093
dc.description.abstractAn experiment was conducted to investigate the aerodynamic losses of two high-pressure steam turbine nozzles (526A, 525B) subjected to a large range of incident angle and exit Mach number. The blades were tested in a 2D transonic windtunnel. The exit Mach number ranged from 0.60 to 1.15 and the incidence was varied from -34o to 35o. Measurements included downstream Pitot probe traverses, upstream total pressure, and endwall static pressures. Flow visualization techniques such as shadowgraph photography and color oil flow visualization were performed to complement the measured data. When the exit Mach number for both nozzles increased from 0.9 to 1.1, the total pressure loss coefficient increased by a factor of 7 as compared to the total pressure losses observed at subsonic condition (M2<0.9). For the range of incidence tested, the effect of flow incidence on the total pressure losses is less pronounced. Based on shadowgraphs taken during the experiment, it's believed that the large increase in losses at transonic conditions is due to strong shock/boundary layer interaction that may lead to flow separation on the blade suction surface. From the measured total pressure coefficients, a modified loss model that accounts for higher losses at transonic conditions was developed. The new model matches the data much better than the existing Kacker-Okapuu model for transonic exit conditions.en_US
dc.format.mediumETDen_US
dc.publisherVirginia Techen_US
dc.relation.haspartETD1.PDFen_US
dc.rightsThe authors of the theses and dissertations are the copyright owners. Virginia Tech's Digital Library and Archives has their permission to store and provide access to these works.en_US
dc.source.urihttp://scholar.lib.vt.edu/theses/available/etd-042399-112737en_US
dc.subjectSteam Turbineen_US
dc.subjectNozzleen_US
dc.subjectAerodynamic Lossen_US
dc.subjectTransonicen_US
dc.titleEffects of Mach Number and Flow Incidence on Aerodynamic Losses of Steam Turbine Bladesen_US
dc.typeThesisen_US
dc.contributor.departmentMechanical Engineeringen_US
dc.description.degreeMSen_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record