Merilni sistem za določanje koeficienta upora preskušanca v vetrovniku

Golob, Urban (author), Kutin, Jože (mentor), Bobovnik, Gregor (co-mentor)

Hitrost zraka in aerodinamične lastnosti zastojnih teles v vetrovniku imajo največji vpliv na aerodinamične sile, ki delujejo na telo v toku tekočine. Z namenom določanja aerodinamičnih sil in koeficienta upora teles v vetrovniku smo v okviru diplomskega dela skonstruirali, postavili in validirali merilni sistem za merjenje sil. Izvedli smo meritve sile upora in koeficienta upora za različne oblike (krogla, valj in kocka) in velikosti preskušancev. Dobljeni rezultati kažejo, da je koeficient upora za vse preskušance primerljiv pri hitrostih zraka med 10 m/s in 30 m/s, pri hitrosti 5 m/s pa so opažena določena odstopanja. Eksperimentalno določeni koeficienti upora preskušancev se tudi dobro skladajo z vrednostmi koeficientov pridobljenih iz literature, kar potrjuje ustreznost uporabljenega merilnega sistema.

• Language: Slovenian
• Keywords: vetrovnik, sila upora, koeficient upora, validacija merilnega sistema, nadzorni program
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [U. Golob]
• Year: 2020
• Number of pages: XXII, 58 str.
• PID: 20.500.12556/RUL-118602
• UDC: 519.8:533.6.07(043.2)
• COBISS.SI-ID: 29250051
• Publication date in RUL: 28.08.2020

Secondary language

• Language: English
• Title: The measuring system for determination drag coefficient of object in wind tunnel

Abstract

The air velocity and aerodynamic properties of bluff body in the wind tunnel have the greatest influence on the aerodynamic forces acting on it. With intention to determine the aerodynamic forces and the drag coefficient of different bluff bodies in a wind tunnel, we constructed, set up and validated a new measuring system for measuring. The measurements of drag force and drag coefficient were carried out for different shapes (sphere, cylinder and cube) and sizes of bluff bodies. The obtained results show that the values of drag coefficients are comparable for air velocities between 10 and 30 m/s, while smaller deviations were noticed at 5 m/s. The experimentally determined values of drag coefficients agree well with the values from literature, which confirms the adequacy of the measuring system.

• Keywords: wind tunnel, drag force, drag coefficient, validation of the measuring system, control program