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Reference: Shrinivas, G. N., (1996). Three-dimensional design methods for turbomachinery applications. DPhil. University of Oxford.Citable link to this page:

 

Three-dimensional design methods for turbomachinery applications

Abstract: This thesis studies the application of sensitivity analysis and optimizationmethods to the design of turbomachinery components. Basic design issuesand a survey of current design trends are presented. The redesign of outletguide vanes (OGV's) in an aircraft high bypass turbofan engine is attempted.The redesign is necessitated by the interaction of the pylon induced staticpressure field with the OGV's and the fan, leading to reduced OGV efficiencyand shortened fan life. The concept of cyclically varying camber is used toredesign the OGV row to achieve suppression of the downstream disturbancein the domain upstream of the OGV row. The redesign is performed using(a) a linear perturbation CFD analysis and (b) a minimisation of the pressuremismatch integral by using a Newton method. In method (a) the sensitivity ofthe upstream flow field to changes in blade geometry is acquired from the linearperturbation CFD analysis, while in method (b) it is calculated by perturbingthe blade geometry and differencing the resulting flow fields. Method (a)leads to a reduction in the pylon induced pressure variation at the fan bymore than 70% while method (b) achieves up to 86%. An OGV row with only3 different blade shapes is designed using the above method and is found tosuppress the pressure perturbation by more than 73%. Results from thesecalculations are presented and discussed. The quasi-Newton design method isalso used to redesign a three dimensional OGV row and achieves considerablereduction of upstream pressure variation. A concluding discussion summarisesthe experiences and suggests possible avenues for further work.

Type of Award:DPhil Level of Award:Doctoral Awarding Institution: University of Oxford Notes:This thesis was digitised thanks to the generosity of Dr Leonard Polonsky

Bibliographic Details

Issue Date: 1996Identifiers

Urn: uuid:8ace58b5-e251-491e-9753-ae8b236d6c3b

Source identifier: 603836199 Item Description

Type: Thesis;

Language: eng Subjects: Turbomachines Design and construction Data processing Computer-aided design Tiny URL: td:603836199

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Autor: Shrinivas, G. N. - institutionUniversity of Oxford facultyOxford University Computing Laboratory - - - - Bibliographic Details Is

Fuente: https://ora.ox.ac.uk/objects/uuid:8ace58b5-e251-491e-9753-ae8b236d6c3b



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