magistrsko delo magistrskega študijskega programa II. stopnje Strojništvo
Nika Hrušovar (Author), Gregor Bobovnik (Mentor), Jože Kutin (Co-mentor)

Abstract

Homogenost in stabilnost hitrostnega polja v merilni sekciji vetrovnika imata velik vpliv na rezultate merjenja hitrosti zraka v vetrovniku. V okviru magistrskega dela smo postavili in opisali novo merilno progo z dvo-komponentnim LDA merilnikom in vetrovnikom. Posebno pozornost smo posvetili popisu funkcij v nadzornem programu. Dobljeni rezultati kažejo, da je stabilnost pri hitrostih zraka med 10 in 30 m/s manj kot 0,2 %, pri hitrosti zraka 0,3 m/s pa je bila izračunana stabilnost več kot 10 %. Karakterizacija hitrostnih profilov je pokazala spreminjanje hitrostnega profila vzdolž merilne sekcije, kar je posledica geometrijske razširitve. Homogenost hitrostnega polja smo izračunali za različne velikosti pretočnih prerezov in različne hitrosti. Izračunana homogenost je manj kot 1,2 %, razen pri majhnih hitrostih (npr. 0,3 m/s), kjer znaša 3,8 %. Iz meritev homogenosti ne moremo izločiti vpliva nestabilnosti. Z izvedbo dodatne meritve smo opozorili tudi na upoštevanje zastojnega učinka pri umerjanju v polju pred merilnikom v merilni sekciji.

Keywords

magistrske naloge;merjenje hitrosti;laser Dopplerjev anemometer;hitrostni profil;vetrovniki;homogenost;stabilnost;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UL FS - Faculty of Mechanical Engineering
Publisher: [N. Hrušovar]
UDC: 533.6.071:551.508.54(043.2)
COBISS: 16919067 Link will open in a new window
Views: 951
Downloads: 266
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Other data

Secondary language: English
Secondary title: Assessment of homogeneity and stability of the flow field in the measuring section of the wind tunnel
Secondary abstract: The homogeneity and stability of the velocity field in the measuring section of the wind tunnel have a significant influence on the results of air velocity measurements in the wind tunnel. In this master's thesis, we set up and described a new measuring system with the two-component LDA and the wind tunnel. Special attention was devoted to the description of the functions in the control program. The results show that the stability of the air velocity between 10 and 30 m/s is less than 0.2 % and for lower velocities higher than 10 %. Characterization of velocity profiles showed a change in velocity profile along the measurement section resulting from the geometric extension. The homogeneity of the velocity field was calculated for different cross-sectional areas and different velocities. The experimental data show that the homogeneity is less than 1.2 %, except at low speeds (e.g. 0.3 m / s), where it is equal to 3.8 %. The impact of the instability cannot be excluded from homogeneity measurements. By performing an additional measurement, we also noted that the blockage effect occurs in the field upstream of the anemometer in the measuring section.
Secondary keywords: velocity measurement;lasser doppler anemometer;velocity profile;wind tunnel;homogeneity;stability;
Type (COBISS): Master's thesis/paper
Study programme: 0
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. Ljubljana, Fak. za strojništvo
Pages: XXII, [56] str.
ID: 11219412
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