Uporaba BEM metode za izračun izkoristka vetrne turbine

diplomsko delo

Miha Smrekar (Author), Matej Fike (Mentor), Andrej Predin (Co-mentor)

Abstract

Teorija gibalne količine elementov lopatice (angl. Blade Element Momentum Theory – BEM) je analitična metoda, ki se uporablja za izračun karakterističnih sil, ki delujejo na vetrno turbino ali propeler. V diplomski nalogi smo zbrali teorijo analitičnega izračuna z metodo BEM, izdelali program za analizo vetrne turbine ter ovrednotili analitične rezultate. Za izračun smo uporabili model trolopatične vetrne turbine s polmerom 0,45 m in aerodinamičnim profilom NREL S826. Ugotovili smo, da je potrebno za kvaliteten izračun z BEM metodo uporabiti popravke BEM metode in izvedli smo preračun z uporabo popravkov za visoke vrednosti indukcijskega faktorja, popravkov rotacijske augmentacije ter popravkov izgub na vrhu in ob vznožju lopatice. Z optimizacijsko metodo algoritma diferencialne evolucije smo prikazali postopek optimizacije vetrne turbine v obratovalni točki razmerja hitrosti vrha lopatice λ=5,89. Najvišji izračunani izkoristek optimizirane geometrije je dosegel 12 % višji izkoristek od izračunanega izkoristka osnovne geometrije, slabost optimizirane geometrije pa je bila večja sila upora na vetrnico v primerjavi z osnovno geometrijo.

Keywords

energija vetra;vetrne elektrarne;vetrne turbine;BEM;diplomske naloge;

Data

Language:	Slovenian
Year of publishing:	2019
Typology:	2.11 - Undergraduate Thesis
Organization:	UM FE - Faculty of Energetics
Publisher:	[M. Smrekar]
UDC:	621.311.245:004.42(043.2)
COBISS:	1024360028
Views:	1026
Downloads:	123
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Application of BEM method for wind turbine efficiency calculation
Secondary abstract:	The BEM (Blade Element Momentum Theory) method is an analytical method used to calculate the characteristic forces acting on a wind turbine or propeller. In the thesis we collected the theory of analytical calculation using the BEM method, designed a program for the analysis of wind turbines and evaluated the analytical results. For the calculation, we used a model of a three-blade wind turbine with a radius of 0.45 m and the aerodynamic profile NREL S826. We found that BEM method corrections were necessary for accurate calculations using the BEM method, and a calculation was made using high induction factor corrections, rotational augmentation corrections, and corrections for losses at the top and bottom of the blade. With the optimization method of the differential evolution algorithm, we have shown the process of optimization of the wind turbine at the operating point of the tip-speed ratio λ = 5,89. The highest calculated efficiency of the optimized geometry reached a 12% higher efficiency than the calculated efficiency of the basic geometry, but the disadvantage of the optimized geometry was a greater force of air resistance on the windmill, in comparison to the original geometry.
Secondary keywords:	Wind Energy;Wind Turbines;BEM Theory;
Type (COBISS):	Bachelor thesis/paper
Thesis comment:	Univ. v Mariboru, Fakulteta za energetiko
Pages:	XIII f., 77 str.
ID:	11204967