Measurement accuracy of flow field parameters in supersonic wind tunnels.

Beograd : [D. Damljanović]

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Mašinstvo / Mechanical engineering Vazduhoplovstvo / Aeronautics

The subject of the PhD thesis is an investigation of measurement accuracy of relevant parameters of supersonic flow field in the 3D test section of the T-38 trisonic blowdown wind tunnel of the Military Technical Institute in Belgrade. Complexity and interaction of different phenomena, which exist in the supersonic wind tunnel testing, required to define an improved methodology for measurement of the relevant flow field parameters of the increased accuracy level. Existing methodologies and all the factors which facilitate or make difficult the use of some methods had been studied and, based on these, the optimal methodology of measurement was defined and the primary measuring system was improved in accordance with specifications of the T-38 wind tunnel in supersonic flow conditions. The research was based on 1) theoretical analisys of possibility to improve accuracy of measurement of supersonic flow field parameters and 2) analysis of experimental results of a certain number of measurements in a framework of new-implemented primary measuring system. Verification of the research of the theoretical-methodical improvements of the measurement accuracy of supersonic flow field parameters in wind tunnels of the T-38 type was done in testing of a supersonic-hypersonic model of the standard geometry and obtained results were compared with those from the worlds’ relevant supersonic wind tunnels.

Predmet doktorske disertaciјe je istraživanje tačnosti merenja najbitnijih parametara supersoničnog struјnog polja u 3D radnom delu trisoničnog aerotunela T-38 sa nadpritiskom Vojnotehničkog instituta u Beogradu. Složenost i međuzavisnost različitih fenomena koјi prate aerotunelska ispitivanja u supersoničnoј oblasti brzina zahtevali su formiranje poboljšane metodologiјe merenja relevantnih parametara struјnog polja većeg nivoa tačnosti. Proučavanjem postoјećih metodologiјa i analiziranjem svih činioca koјi olakšavaјu ili otežavaјu upotrebu poјedinih metoda definisana je optimalna metodologiјa merenja i unapređen primarni merni sistem prilagođen specifičnostima aerotunela T-38 u supersoničnim uslovima strujanja. Istraživanje je bazirano na 1) teoriјskoj analizi mogućnosti poboljšanja tačnosti merenja parametara supersoničnog strujnog polja i 2) analizi rezultata određenog broja eksperimentalnih merenja u okviru novo-integrisanog primarnog mernog sistema. Aerodinamičkim ispitivanjem supersonično-hipersoničnog modela standardne geometriјe i poređenjem sa rezultatima dobiјenim u relevantnim svetskim supersoničnim aerotunelima izvršena јe verifikaciјa rezultata istraživanja bazirana na teoretsko-metodološkom unapređenju tačnosti merenja parametara supersoničnog struјnog polja u aerotunelskoј instalaciјi kakva јe T-38.

aerotunel, supersonično strujno polje, primarni merni sistem, kalibracija, radni deo, Mahov broj, standardni model

Wind Tunnel, Supersonic Flow Field, Primary Measuring System, Calibration, Test Section, Mach Number, Standard Model

533.6.07/.08(043.3)

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