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Analiza vpliva zložljivega propelerja in različnih geometrij propelerske kape na upor tekmovalnega jadralnega modela letala : diplomsko delo Visokošolskega strokovnega študijskega programa I. stopnje StrojništvoZubalic, EmilV tem delu smo se osredotočili na analizo upora jadralnega modela letala, ki ga povzroča zložljivi propeler, ko ne obratuje. Upor smo izračunali z računalniško dinamiko tekočin, saj so natančne ... meritve na pravem modelu težko izvedljive. Pri izračunih smo se omejili na področje trupa pred krilom. Izračunali smo tlačno-hitrostno polje v okolici prednjega dela trupa letala, v petih različnih konfiguracijah: trup brez propelerja, trup z navadnim zložljivim propelerjem (z odprtino in brez odprtine za hlajenje motorja) in trup s propelerjem, ki se bolje prilega trupu (z odprtino in brez odprtine za hlajenje motorja). Uporabili smo nestrukturirano računsko mrežo, kateri smo spremenili tako razsežnost kot gostoto, da smo zagotovili neodvisnost od računske mreže. Za izračune smo uporabili orodje Ansys Fluent. Pri trupu brez propelerja smo izračune opravili z laminarnim tokom. Ko je propeler nastavljen na trup, smo izračune izvedli s turbulenčnim modelom Spalart-Allmaras. Ker moramo oceniti vpliv propelerja na upor celotnega letala, smo s sistemom GPS in z barometričnim višinomerom izmerili karakteristike modela letala. Ugotovili smo, da prisotnost propelerja poveča zračni upor letala za približno 2 %. Navaden zložljivi propeler ustvari intenzivnejšo turbulenco kot prilegajoči se propeler. Razlika upora dveh propelerjev je nekje 0,1 %. Rezultati simulacij kažejo, da prisotnost odprtine za hlajenje zmanjšuje upor letala.Type of material - undergraduate thesis ; adult, seriousPublication and manufacture - Ljubljana : [E. Zubalic], 2020Language - slovenianCOBISS.SI-ID - 32792579
Author
Zubalic, Emil
Other authors
Šarler, Božidar
Topics
diplomske naloge |
zložljiv propeler |
zračni upor |
jadralno letalo |
računalniška dinamika tekočin |
thesis |
folding propeller |
aerodynamic drag |
glider |
computational fluid dynamics
Library/institution |
City | Acronym | For loan | Other holdings |
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Faculty of Mechanical Engineering, Ljubljana | Ljubljana | FSLJ |
reading room 1 cop.
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Zubalic, Emil | |
Šarler, Božidar | 04101 |
Source: Personal bibliographies
and: SICRIS
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