Investigation of effective parameters on darrieus wind turbine efficiency with aerodynamics models

Transcription

1 mme.modares.ac.ir * mohammad.javadi@qiet.ac.ir * () : : : Investigationofeffectiveparametersondarrieuswindturbineefficiency withaerodynamicsmodels AlirezaArabGolarche MohammadMoghiman, SeyyedMohammadJavadiMalAbad * -DepartmentofMechanicalEngineering,FerdowsiUniversity ofmashhad,mashhad,iran. -DepartmentofMechanicalEngineering,QuchanUniversityofAdvancedTechnology,Quchan,Iran. P.O.B.9775-Mashhad,Iran,mohammad.javadi@qiet.ac.ir ARTICEINFORMATION ABSTRACT OriginalResearchPaper ReceivedFebruary5 Accepted4February5 AvailableOnline4April5 Keywords: WindTurbine Darrieus SectionofBlade Solidity. Darrieusturbineistypeofverticalaxiswindturbinewhich,unlikeit'ssimplestructure,makes behavior analysis is hard computational task. Because of the complex flows around the machines, aerodynamic optimization problem still remains an open question. In this paper, numerical algorithm based on the Double Multiple Stream tube model is used to calculate the effect of the parameters that influence the efficiency of the Darrieus turbine. This method is semi-empirical method using lift and drag coefficients obtained from experimental data. Comparisonbetweentheresultsofthepresentstudywiththeexperimentalmeasurementsshows that although the developed algorithm gives acceptable results, for higher rotational speeds it achieves nominal rotational velocity, and the model accuracy becomes lower. The aim of this paperis tofindoptimalconditions, parametricallyanalyzethe effectofbladethickness,solidity, Reynoldsnumber,pitchangleandaspectratioonturbineefficiencyandstart.Theresultsshow thatincreasingthickness,reynoldsnumberandsoliditycauseanincreaseintheturbineself-start capability.ontheotherhand,increasingthesolidityoftheturbinewillreduceworkingrange,and increasing the aspect ratio will increase efficiency, especially at the nominal rotational velocity. Theresultsalsoshowthatthedesignedturbine,havingvariablesolidity,canhavethebenefitsof bothlowandhighsolidityturbinessimultaneously.butmanufacturingvariablethicknessblades doesnothaveproperjustification.imitedincreaseinpitchanglecanalsohavepositiveeffecton efficiency. - Pleasecitethisarticleusing: : A. ArabGolarche, M. Moghiman, S. M. Javadi MalAbad, Investigation of effective parameters on darrieus wind turbine efficiency with aerodynamics models, Modares MechanicalEngineeringVol. 5, No. 5, pp. 95-3, 5 (In Persian)

2 7.() [6]... [7] 9 [8] [9]. () 8 ( ) [].. - v - 7- Double-MultipleStreamtubeModel 8- Solidity.[].[]... () [3] 4..[4] [5] 5 [5] [5].[4] Vertical-AxisWindTurbines -ComputationalFluidDynamic(CFD) 3-VortexPanelMethod 4- BladeElementMomentum 5- SingleStreamtubeModel 6- MultipleStreamtubeModel 96

3 ./4 (Vbl) (Abl) () (C).. (s) () () r. = = = n () () () (v) = tan cos sin ( ( ) ) 3 (). a (3)(Vrel) v (4) = [ cos ] + [ sin ] (3) = = ( ) (4) + ( ) sin () (Vrel) (CD) (C) (5) = [ sin cos ] (5) = [ cos( + ) sin( + )] 3. (4) (6) ()(9) (6) 4. (3) v3.b (7). c (8) (9) = tan cos sin ( ( )( ) ) (7) = + + sin (8) = ( )( ) (9). () = cos 4( )( ) () - TipSpeedRatio(TSR) 3- Upwind 4- Downwind (v) a. (v). () (4) () v3 vv = ( ) = ( ) = ( + ) () () (3) = ( ) = ( )( ) (4). b (4) v v (6) (5) (5) = ( ) = [ cos ] ( ) (6) (6). 36. h. (6). (7) (8) = (7) = cos ( ) (8). N(7) (9) (8) = = cos 4( ) /4 a (9) a. - InductionFactor

4 4 =.5 /5 = =44 = ) 3. (/8) ( (8 4 ) () ) ( 4 SANDIA Exp Paraschivoiu Present Study ±4. 6 ±3. - NACA(NationalAdvisoryCommitteeforAeronautic) - DeadBand (deg) (deg) 3. () =. = (3) () () = = () = d (3) []. 4 [6] [] / [9] 98

5 C P Re= Re=8 Re=6 Re= Re=36 Re= Re=7.. Cl (deg) [] 8 ) ) CRe= Re CRe Re8 CRe Re6 CRe Re36 CRe Re7 Re -- 9 (/4).[] /5.. /5 Cl C P [] / ±4 4 8 ±3.... /4-9 NACA NACA5 NACA8 NACA NACA NACA5 NACA8 NACA (deg) ( )

6 NACA5 NACA8 NACA designed blade (4) AR = = (4) 3 3 / AR=.5 AR=.5 AR= 4 (D) /5... /5 / /67 /5 C p AspectRatio 3

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