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Designosäkerhet av Vinci LH2-turbinen
2013 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The purpose of this thesis is to increase the knowledge about measurement uncertainties and its effect on the performance of the Vinci LH2 (Liquid Hydrogen) turbine. The measurement uncertainties evaluated are the ones affecting the test data from the DVT (Design Verification Test) test which is an early approach in the design process to characterize the aerodynamic performance scaled from an air environment. General uncertainty methods are applied to obtain the performance uncertainty from the measurement uncertainties in the instrumentation.Two CFD models of the Vinci turbine are used to expand the uncertainty assessment and to examine uncertainty factors not accounted for in the DVT test. Effects such as position uncertainty and how well the probe represents the station average value can be studied.When the performance is to be analyzed the critical objective is to create the confidence interval and its corresponding confidence level. The error can be divided into two groups: Systematic and random error. When creating an uncertainty interval it can sometimes be favorable to study either the standard uncertainty or the standard uncertainty of the mean depending on the scatter in the sample. The standard uncertainty considers the uncertainty of all data points in the sample whilst the standard uncertainty of the mean considers the uncertainty of the sample average. A high confidence level is very attractive as long as the expanded uncertainty interval does not exceed the tolerance limit.

Place, publisher, year, edition, pages
2013. , 96 p.
Keyword [en]
Keyword [sv]
Teknik, Rymdturbin, Osäkerhet, Statistik, Vinci
URN: urn:nbn:se:ltu:diva-48694Local ID: 61f67e29-8f46-418d-b219-a7e878d033cdOAI: diva2:1022038
Subject / course
Student thesis, at least 30 credits
Educational program
Space Engineering, master's level
Validerat; 20130418 (global_studentproject_submitter)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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Skoglund, Ragnar

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