Investigation of the Effects of Various Energy and Exergy-Based Objectives/Figures of Merit on the Optimal Design of High Performance Aircraft System

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dc.contributor.authorPeriannan, Vijayananden
dc.contributor.committeechairvon Spakovsky, Michael R.en
dc.contributor.committeememberMoorhouse, Daviden
dc.contributor.committeememberNelson, Douglas J.en
dc.contributor.committeememberEllis, Michael W.en
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T20:32:21Zen
dc.date.adate2005-05-17en
dc.date.available2014-03-14T20:32:21Zen
dc.date.issued2005-02-18en
dc.date.rdate2005-05-17en
dc.date.sdate2005-03-04en
dc.description.abstractThis thesis work shows the advantages of applying exergy-based analysis and optimization methods to the synthesis/design and operation an Advanced Aircraft Fighter (AAF) with three subsystems: a Propulsion Subsystem (PS), an Environmental Control Subsystem (ECS), and an Airframe Subsys-tem - Aerodyanmics (AFS-A) is used to illustrate these advantages. Thermodynamic (both energy and exergy), aerodynamic, geometric, and physical models of the components comprising the subsystems are developed and their interactions defined. An exergy-based parametric study of the PS and its components is first performed in order to show the type of detailed information on internal system losses. This is followed by a series of constrained, system synthesis/design optimizations based on five different objective functions, which define energy-based and exergy-based measures of performance. A first set of optimizations involving four of the objectives (two energy-based and two exergy-based) are performed with only PS and ECS degrees of freedom. Losses for the AFS-A are not incorporated into the two exergy-based objectives. The results show that as expected all four objectives globally produce the same optimum vehicle.A second set of optimizations is then performed with AFS-A degrees of freedom and again with two energy- and exergy-based objectives. However, this time one of the exergy-based objectives incorporates AFS-A losses directly into the objective. The results are that this latter objective produces a significantly better optimum vehicle. Thus, an exergy-based approach is not only able to pinpoint where the greatest inefficiencies in the system occur but produces a superior optimum vehicle as well by accounting for irreversibility losses in subsystems (e.g., the AFS-A) only indirectly tied to fuel usage.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-03042005-151411en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-03042005-151411/en
dc.identifier.urihttp://hdl.handle.net/10919/31405en
dc.publisherVirginia Techen
dc.relation.haspartVijay_Thesis.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectexergyen
dc.subjectAAFen
dc.subjectOptimizationen
dc.titleInvestigation of the Effects of Various Energy and Exergy-Based Objectives/Figures of Merit on the Optimal Design of High Performance Aircraft Systemen
dc.typeThesisen
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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