An experimental approach of the effects of lightning currents on rotor blade tips of wind turbines

2012 ◽  
Author(s):  
Yaru Mendez Hernandez ◽  
Wolfgang Zischank ◽  
Klaus Stimper ◽  
Bastian Lewke
Keyword(s):  
Wind Turbines ◽  
Rotor Blade ◽  
Experimental Approach ◽  
Blade Tips

An Analysis and Experimental Study of the Rotor Blade with Composite Material Fiber Reinforced Plastics

2006 ◽  
Vol 306-308 ◽  
pp. 851-856
Author(s):  
C.Y. Son ◽  
H.I. Byun ◽  
K.H. Kim ◽  
J.K. Choi ◽  
J.Y. Shin
Keyword(s):  
Wind Turbines ◽  
Rotor Blade ◽  
Large Scale ◽  
Fem Analysis ◽  
Small Scale ◽  
Fiber Reinforced ◽  
Fatigue Load ◽  
Reinforced Plastics ◽  
Bending Load ◽  
Behavior Characteristic

In these days, large-scale wind turbines are being made of the Glass Fiber Reinforced Plastic (hereinafter F.R.P). Some reinforcement stiffeners such as carbon fiber and polyamide (Kevlar) are not economical for the wind turbine. In addition, the steel or aluminum alloy, featuring heavy weight and metallic fatigue load, is not suitable for global use, except very small-scale wind turbines. In this study, we manufactured a 10kW-grade small Rotor Blade with the F. R. P featuring high stiffness and good dynamic behavior characteristic, and carried out experiments for understanding the bending behavior characteristic of the fatigue load and bending load. And, we examined the experiment results through the Finite Element Method. We compared the experiment results and FEM analysis outputs using the commercial ANSYS FEM program.

Combined analytical and experimental approaches to rotor components stress predictions

2011 ◽  
Vol 225 (4) ◽  
pp. 322-330 ◽  
Author(s):  
M Chierichetti ◽  
C McColl ◽  
D Palmer ◽  
M Ruzzene ◽  
O Bauchau
Keyword(s):  
Experimental Data ◽  
Dynamic Response ◽  
Complex Systems ◽  
Rotor Blade ◽  
Experimental Approach ◽  
Numerical Results ◽  
Multibody Model ◽  
Lab Experiments ◽  
Experimental Approaches ◽  
Thin Walled

A combined analytical and experimental approach is introduced to estimate the dynamic response of complex systems from a limited number of measurements. The method is based on the concept that modal information is sufficient to extrapolate the complete map of the response from experimental data through the reconstruction of modal loads. The capabilities of the algorithm are first verified via well-controlled lab experiments on a thin-walled aluminium-rotor blade. Numerical results from a comprehensive UH-60 multibody model are then compared with available experimental data. Significant improvements in the accuracy of the predicted results are achieved when simple airloads models are employed as inputs.

scholarly journals PROSES MANUFAKTUR TURBIN ANGIN SUMBU VERTIKAL TIPE DARRIEUS

JTAM ROTARY ◽  
2019 ◽  
Vol 1 (2) ◽  
pp. 117
Author(s):  
Rian Effendi ◽  
Rudi Siswanto
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Manufacturing Process ◽  
Rotor Blade ◽  
Material Handling ◽  
Group Technology ◽  
Initial Energy ◽  
Drilling Machine ◽  
Grinding Wheels ◽  
The Cost

Wind turbine is one of the tools yamg work to take advantage of wind allergy. Wind turbines based on the type of rotor there are two types of Darrieus wind turbines and Savonius wind turbines. In the manufacturing process using a type of wind turbine type Darrieus. The darrieus turbine is a wind turbine that utilizes the lift style on the rotor blade. This turbine requires initial energy to spin. The formulation of the problem in making this wind turbine is How does the manufacturing process of vertical turbine type darrieus wind turbine and How much is the cost budget on the manufacturing process of the darrieus type verical wind turbine. The components of the wind turbine are the foot frame, bearing bearings, bearings, shafts, disks, blade arms, blades, transmission pulleys and belts-v, while the tools and machinery used in the manufacturing process are electric welding tools, electric grinding wheels, , hand drilling machine, sitting drilling machine, cut lever, riverter pliers, acetylene welding and lathe. Keywords: Wind Turbine, Turbine Components, Tools and MachinesApple, JM. Tata Letak Pabrik dan Pemindahan Bahan. Bandung : Penerbit ITB, Terj. Nurhayati Mardiono.,1990.Maheswari Hesti,Achmad Dany Firdauzy.2015. “Evaluasi Tata Letak Fasilitas Produksi Untuk Meningkatkan Efisiensi Kerja Pada Pt. Nusa Multilaksana. Fakultas Ekonomi”. Jakarta:Universitas Mercu Buana.Susetyo Joko dkk.2010. “Perancangan Ulang Tata Letak Fasilitas Produksi Dengan Pendekatan Group Technology Dan Algoritma Blocplan  Untuk Meminimasi Ongkos  Material Handling”. yogyakarta:AKPRIND.Nova St Meirizha. 2014. “Perancangan Ulang Tata Letak Fasilitas Pada Hanggar Pemeliharaan Pesawat Hawk 100/200  Di Pangkalan Udara Roesmin Nurjadin”. Riau: Program Studi Teknik Industri, Fakultas Teknik,Universitas Muhammadiyah.Wignjosoebroto, sritomo. Tata letak pabrik dan pemindahan bahan. Surabaya: penerbit guna widya., 1996.

Effect of Blade Tip Modifications for Unducted Propulsors on Tip Vortex-Rotor Interaction Noise

2014 ◽  
Author(s):  
Florian Danner ◽  
Christofer Kendall-Torry
Keyword(s):  
Rotor Blade ◽  
Stokes Equations ◽  
Acoustic Emissions ◽  
Tip Vortex ◽  
Navier Stokes ◽  
Navier Stokes Equations ◽  
Tip Vortices ◽  
Blade Tip ◽  
Blade Loads ◽  
Blade Tips

Front rotor tip vortices impinging on a downstream blade row of an unducted propulsor induce distinct unsteadiness to blade loads with associated sound emissions. Since the region of unsteadiness is concentrated near the blade tips, reducing the rear rotor tip diameter represents a potential means for minimising interaction noise. A survey on the aeroacoustic effects resulting from a cropped rear rotor in combination with a front rotor blade tip modification is therefore presented. Analyses are based on data from computational fluid dynamics solutions with the Reynolds-averaged Navier-Stokes equations and direct acoustic predictions. The evaluation of polar directivities, blade surface pressure disturbances and details of the unsteady flow field provide insight into the underlying phenomena. Results show that an arbitrary reduction of the rear rotor tip diameter does not necessarily decrease noise radiation and that winglet-like structures applied to the front rotor blade tips are capable of reducing acoustic emissions due to tip vortex-rotor interactions.

scholarly journals Investigation of Design Features of Compressor Casing Treatment

2014 ◽  
Vol 61 (1) ◽  
pp. 153-161
Author(s):  
Vitaliy Nezym
Keyword(s):  
Rotor Blade ◽  
Axial Compressor ◽  
Design Features ◽  
Casing Treatment ◽  
Groove Configurations ◽  
Compressor Performance ◽  
Operational Range ◽  
Blade Tips

Abstract Casing treatment in the form of circumferential grooves over a rotor blade tips is used for improvement of an axial compressor performance. Usually, these grooves extend compressor’s stall range (stable operational range) but decrease its efficiency. In the paper, there are presented main results of investigations on grooves that influence positively efficiency of compressor. There were investigated traditional (typical) and newly developed groove configurations. Certain grooves combine increase in efficiency with extension in stall range.

Aerodynamics and Acoustics of Rectangular and Swept Rotor Blade Tips

1989 ◽  
Vol 34 (1) ◽  
pp. 42-51 ◽  
Author(s):  
J. Prieur ◽  
P. Lafon ◽  
M. Caplot ◽  
A. Desopper
Keyword(s):  
Rotor Blade ◽  
Blade Tips

Numerical modeling of aeroacoustic characteristics of different savonius blade profiles

2019 ◽  
Vol 30 (6) ◽  
pp. 3349-3369 ◽  
Author(s):  
Seyed Hamid Delbari ◽  
Amir Nejat ◽  
Mohammad H. Ahmadi ◽  
Ali Khaleghi ◽  
Marjan Goodarzi
Keyword(s):  
Numerical Modeling ◽  
Flow Field ◽  
Wind Turbines ◽  
Noise Level ◽  
Rotor Blade ◽  
Speed Ratio ◽  
Residential Areas ◽  
Noise Emission ◽  
Content Type ◽  
Savonius Rotor

Purpose This study aims to carry out numerical modeling to predict aerodynamic noise radiation from four different Savonius rotor blade profile. Design/methodology/approach Incompressible unsteady reynolds-averaged navier-stokes (URANS) approach using gamma–theta turbulence model is conducted to obtain the time accurate turbulent flow field. The Ffowcs Williams and Hawkings (FW-H) acoustic analogy formulation is used for noise predictions at optimal tip speed ratio (TSR). Findings The mean torque and power coefficients are compared with the experimental data and acceptable agreement is observed. The total and Mono+Dipole noise graphs are presented. A discrete tonal component at low frequencies in all graphs is attributed to the blade passing frequency at the given TSR. According to the noise prediction results, Bach type rotor has the lowest level of noise emission. The effect of TSR on the noise level from the Bach rotor is investigated. A direct relation between angular velocity and the noise emission is found. Practical implications The savonius rotor is a type of vertical axis wind turbines suited for mounting in the vicinity of residential areas. Also, wind turbines wherein operation are efficient sources of tonal and broadband noises and affect the inhabitable environment adversely. Therefore, the acoustic pollution assessment is essential for the installation of wind turbines in residential areas. Originality/value This study aims to investigate the radiated noise level of four common Savonius rotor blade profiles, namely, Bach type, Benesh type, semi-elliptic and conventional. As stated above, numbers of studies exploit the URANS method coupled with the FW-H analogy to predict the aeroacoustics behavior of wind turbines. Therefore, this approach is chosen in this research to deal with the aeroacoustics and aerodynamic calculation of the flow field around the aforementioned Savonius blade profiles. The effect of optimal TSR on the emitted noise and the contribution of thickness, loading and quadrupole sources are of interest in this study.

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