Time-averaged and time-accurate aerodynamics for the recessed tip cavity of a rotating high-pressure turbine blade and the stationary outer shroud
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The Ohio State University / OhioLINK
2004
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| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=osu1406807021 |
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ndltd-OhioLink-oai-etd.ohiolink.edu-osu14068070212021-08-03T06:26:29Z Time-averaged and time-accurate aerodynamics for the recessed tip cavity of a rotating high-pressure turbine blade and the stationary outer shroud Green, Brian Richard Mechanical Engineering The unsteady aerodynamics of a single stage high-pressure turbine blade operating at design corrected conditions has been the subject of a thorough study involving detailed measurements and computations. The experimental configuration consisted of a full-stage rotating high-pressure turbine stage (nozzle row and bladed disk) and the adjacent, downstream, low-pressure turbine nozzle row. The vanes of the stage and one half turbine were instrumented at three span wise locations and the blades were also instrumented at three span wise locations as well as in the recessed tip region, and on the platform. The particular instrumentation used was flush mounted miniature Kulite pressure transducers with a frequency response on the order of l00KHz. The stationary shroud was also instrumented with miniature Kulite pressure transducers at specific locations above the rotating blade. The measurements were performed at design corrected conditions corresponding to engine cruise condition. The predictions of the unsteady flow field were obtained using MSU-TURBO, a 3D, time-accurate, non-linear computational fluid dynamics (CFD) code, to model the rotating turbine airfoil. Two analytical methods were employed to understand the unsteady flow physics associated with the turbine blade. The first method takes into account the interaction effects of the three blade rows, while the second method neglects these interaction effects by modeling only the turbine blade row and downstream propagating waves generated by the upstream row. Comparison of the results of these two methods showed very little difference in the unsteady loading and thus only the second method was carried forward for detailed tip and shroud modeling.The unsteady loadings in the form of time-averaged, power series, and time series data from the CFD analyses are compared to the measurements at selected span wise locations on the blade, in the recessed cavity, and on the shroud. The rig and computational models included both a flat tip and recessed blade tip geometry and both were used for the comparisons presented in the thesis. Comparisons of both the time-average and the time-accurate measured and predicted static pressure loading on the blade surface show good correlation. For the first time, comparisons are made between time-resolved, experimental data from a rotating turbine rig and analytical predictions on the blade tip and shroud. These comparisons between analytical and experimental data presented in this thesis demonstrate the ability of the CFD models to capture unsteady flow physics on the blade surface, in the flat and recessed tip regions of the blade, and on the stationary shroud. 2004 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1406807021 http://rave.ohiolink.edu/etdc/view?acc_num=osu1406807021 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
| collection |
NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Mechanical Engineering |
| spellingShingle |
Mechanical Engineering Green, Brian Richard Time-averaged and time-accurate aerodynamics for the recessed tip cavity of a rotating high-pressure turbine blade and the stationary outer shroud |
| author |
Green, Brian Richard |
| author_facet |
Green, Brian Richard |
| author_sort |
Green, Brian Richard |
| title |
Time-averaged and time-accurate aerodynamics for the recessed tip cavity of a rotating high-pressure turbine blade and the stationary outer shroud |
| title_short |
Time-averaged and time-accurate aerodynamics for the recessed tip cavity of a rotating high-pressure turbine blade and the stationary outer shroud |
| title_full |
Time-averaged and time-accurate aerodynamics for the recessed tip cavity of a rotating high-pressure turbine blade and the stationary outer shroud |
| title_fullStr |
Time-averaged and time-accurate aerodynamics for the recessed tip cavity of a rotating high-pressure turbine blade and the stationary outer shroud |
| title_full_unstemmed |
Time-averaged and time-accurate aerodynamics for the recessed tip cavity of a rotating high-pressure turbine blade and the stationary outer shroud |
| title_sort |
time-averaged and time-accurate aerodynamics for the recessed tip cavity of a rotating high-pressure turbine blade and the stationary outer shroud |
| publisher |
The Ohio State University / OhioLINK |
| publishDate |
2004 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=osu1406807021 |
| work_keys_str_mv |
AT greenbrianrichard timeaveragedandtimeaccurateaerodynamicsfortherecessedtipcavityofarotatinghighpressureturbinebladeandthestationaryoutershroud |
| _version_ |
1719436886331621376 |