scholarly journals PERANCANGAN SUDU TANGKAP TERHADAP VARIASI KECEPATAN ANGIN PADA TURBIN ANGIN

2019 ◽  
Vol 9 (2) ◽  
pp. 1-7
Author(s):  
Bambang Sulaksono
Keyword(s):  
Wind Turbine ◽  
Swept Area

Rancangan ini dilakukan untuk memanfaatkan energi angin yang ada di Indonesia. Metode perancangan yang dilakukan dengan cara analisis perhitungan numerik dan gambar rancangan dengan menggunakan software AutoCAD. Software AutoCAD digunakan untuk mendisain hasil perhitungan numerik menjadi gambar ditail. Berdasar data dari buku sumber A Wind Turbine Recipe Book, dikembangkan untuk penelitian ini.kecepatan angin optimal berada pada ketinggian > 50 m. Analisis perhitungan numerik dari manual book menghasilkan ukuran chord airfoil dan sudut pitch airfoil. Hasil analisis tersebut digunakan sebagai variabel input untuk rancang bangun turbin angin. Hasil rancangan turbin angin ini memiliki rata – rata kecepatan angin yang bervariasi antar 3-7 m/s pada ketinggian pada ketinggian 50 m. Rotor turbin angin ini memiliki diameter 3 m dengan swept area 4,5-7,068 m2 serta kecepatan putar 401 rpm. Rotor ini menggunakan jenis airfoil NREL S818 untuk bagian root, S825 untuk bagian primary, dan S822untuk bagian tip dengan tiap bagian airfoil ini dibagi menjadi 5 segmen dengan masing – masing jarak tiap segmen (r)TIP2-TIP 1 =300, dan tiap segmen dari Tip2 - 6 = 200 . kecepatan awalan angin untuk memutar turbin ini (cut in) sebesar 3 m/d dengan daya yang didapat sebesar 65,90 Watt pada blade utama dan 102,06Watt pada dobel blade.

The Optimum Solution to Diameter of the Down Wind Turbine

2011 ◽  
Vol 201-203 ◽  
pp. 367-371
Author(s):  
Li Zhang
Keyword(s):  
Wind Turbine ◽  
Wind Shear ◽  
Energy Output ◽  
Mathematics Model ◽  
Calculation Methods ◽  
Concrete Case ◽  
Calculation Results ◽  
Optimum Solution ◽  
Tower Height ◽  
Swept Area

In view of the deficiency in calculation precision of turbine diameter at present, the mathematics model of energy distribution on swept area of the down wind turbine was proposed, and the energy expression that taked into account wind shear and tower shade effect was also accurately deduced.Combining with the concrete case, three different calculation methods about turbine dimeter were respectively solved.The calculation results show that the influence of wind shear is really little in turbine diameter calculation.The influentce of tower shade effect is obvious,while the influence of tower height is maximal. There is approximately a linear relationship between the turbine diameter and the tower diameter. The tower height has the maximum. There is a optimum match relationship that satisfies the demand of energy output in the down wind turbine.

scholarly journals Influence of the Heights of Low-Level Jets on Power and Aerodynamic Loads of a Horizontal Axis Wind Turbine Rotor

Atmosphere ◽  
2019 ◽  
Vol 10 (3) ◽  
pp. 132 ◽  
Author(s):  
Xuyao Zhang ◽  
Congxin Yang ◽  
Shoutu Li
Keyword(s):  
Wind Speed ◽  
Power Spectrum ◽  
Wind Turbine ◽  
Horizontal Axis ◽  
Horizontal Axis Wind Turbine ◽  
Aerodynamic Loads ◽  
Low Level ◽  
Low Level Jets ◽  
Inflow Conditions ◽  
Swept Area

The influence of the heights of low-level jets (LLJs) on the rotor power and aerodynamic loads of a horizontal axis wind turbine were investigated using the fatigue, aerodynamics, structures, and turbulence code. The LLJ and shear inflow wind fields were generated using an existing wind speed spectral model. We found that the rotor power predicted by the average wind speed of the hub height is higher than the actual power in relatively weak and shallow LLJ inflow conditions, especially when the LLJ height is located inside the rotor-swept area. In terms of aerodynamic loads, when the LLJ height is located inside the rotor-swept area, the root mean square (RMS) rotor thrust coefficient and torque coefficient increase, while the RMS rotor unbalanced aerodynamic load coefficients, including lateral force, longitudinal force, tilt moment, and yaw moment, decreased. This means that the presence of both positive and negative wind shear in the rotor-swept area not only increases the rotor power but also reduces the unbalanced aerodynamic loads, which is beneficial to the operation of wind turbine. Power spectrum analysis shows no obvious difference in the power spectrum characteristics of the rotor torque and thrust in LLJ inflow conditions with different heights.

scholarly journals Wind Turbine Power Calculations Using MATLAB-SIMULINK

2021 ◽  
pp. 54-61
Author(s):  
H. L. Suresh ◽  
C. V. Mohan ◽  
Nitin Kumar Reddy K N
Keyword(s):  
Wind Speed ◽  
Modeling And Simulation ◽  
Wind Turbine ◽  
Wind Velocity ◽  
Simulation Method ◽  
Financial Viability ◽  
Turbine Performance ◽  
Air Density ◽  
Overall Performance ◽  
Swept Area

In this paper modeling and simulation has been studied by means of impact of energy generated by using wind turbine. The strength conversion primarily depends on the wind velocity and swept area. When design wind structures it’s very important to recognize predicted electricity and electricity output for calculating financial viability. Wind turbine performance depends on wind speed, air density, air pressure, temperature and length of blade. The modeling and simulation method is used to analyze the overall performance of wind turbine.

scholarly journals Comparison of Blade Dimension Design of a Vertical Wind Turbine Applied in Low Wind Speed

2018 ◽  
Vol 68 ◽  
pp. 01001
Author(s):  
Rizky Brillian Yuliandi ◽  
Rusdianasari ◽  
Tresna Dewi
Keyword(s):  
Wind Turbine ◽  
Lift Force ◽  
Advantages And Disadvantages ◽  
Low Wind Speed ◽  
Turbine Performance ◽  
Experimental Variation ◽  
Drag And Lift ◽  
Overlap Ratio ◽  
Swept Area ◽  
Made In

The type of vertical turbine used for this research was a savonious where the profile of the blade was made in the form of a half-cylinder. The performance of the turbine rotation was strongly influenced by the swept area. Drag and lift force was influenced by the swept area. Both of the forces had its own advantages and disadvantages. Because of that, the dimensional engineering was implemented to obtain the optimal performance of the turbine. Experimental dimensions were tested with the variation of height size (H = 40 cm and 60 cm) and diameter size (D = 40 cm and 60 cm). The distance between the blades known as the overlap ratio was related to the dimensions. Overlap ratio has a role to the upwind and downwind wind flow because the overlap ratio changes affect the swept area. The experimental variation of the overlap ratio was at the distance of 0 cm and 10 cm. The experimental results concluded that the best turbine performance was obtained during wind turbine testing with H = 40 cm and D = 60 cm on primary overlap value minus 10 cm and secondary overlap 0 cm.

scholarly journals Doppler Lidar Investigations of Wind Turbine Near-Wakes and LES Modeling with New Porous Disc Approach

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2101
Author(s):  
Takanori Uchida ◽  
Tadasuke Yoshida ◽  
Masaki Inui ◽  
Yoshihiro Taniyama
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Wind Farms ◽  
Offshore Wind ◽  
Offshore Wind Farms ◽  
Wind Speeds ◽  
Wind Speed Distribution ◽  
Wake Model ◽  
Turbine Wake ◽  
Swept Area

Many bottom-mounted offshore wind farms are currently planned for the coastal areas of Japan, in which wind speeds of 6.0–10.0 m/s are extremely common. The impact of such wind speeds is very relevant for the realization of bottom-mounted offshore wind farms. In evaluating the feasibility of these wind farms, therefore, strict evaluation at wind speeds of 6.0–10.0 m/s is important. In the present study, the airflow characteristics of 2 MW-class downwind wind turbine wake flows were first investigated using a vertically profiling remote sensing wind measurement device (lidar). The wind turbines used in this study are installed at the point where the sea is just in front of the wind turbines. A ground-based continuous-wave (CW) conically scanning wind lidar system (“ZephIR ZX300”) was used. Focusing on the wind turbine near-wakes, the detailed behaviors were considered. We found that the influence of the wind turbine wake, that is, the wake loss (wind velocity deficit), is extremely large in the wind speed range of 6.0–10.0 m/s, and that the wake loss was almost constant at such wind speeds (6.0–10.0 m/s). It was additionally shown that these results correspond to the distribution of the thrust coefficient of the wind turbine. We proposed a computational fluid dynamics (CFD) porous disk (PD) wake model as an intermediate method between engineering wake models and CFD wake models. Based on the above observations, the wind speed range for reproducing the behavior of the wind turbine wakes with the CFD PD wake model we developed was set to 6.0–10.0 m/s. Targeting the vertical wind speed distribution in the near-wake region acquired in the “ZephIR ZX300”, we tuned the parameters of the CFD PD wake model (CRC = 2.5). We found that in practice, when evaluating the mean wind velocity deficit due to wind turbine wakes, applying the CFD PD wake model in the wind turbine swept area was very effective. That is, the CFD PD wake model can reproduce the mean average wind speed distribution in the wind turbine swept area.

scholarly journals Theoretical Study of Wind Turbine Model with a New Concept on Swept Area

2015 ◽  
Vol 07 (04) ◽  
pp. 127-134 ◽  
Author(s):  
Sagarkumar M. Agravat ◽  
N. V. S. Manyam ◽  
Sanket Mankar ◽  
T. Harinarayana
Keyword(s):  
Wind Turbine ◽  
Theoretical Study ◽  
Swept Area ◽  
Turbine Model

scholarly journals Another Approach to Wind

2004 ◽  
Vol 126 (06) ◽  
pp. 28-31 ◽  
Author(s):  
Steven Peace
Keyword(s):  
Wind Turbine ◽  
Centrifugal Force ◽  
Power Output ◽  
Vertical Axis ◽  
Horizontal Axis ◽  
Masonry Structures ◽  
Horizontal Axis Wind Turbine ◽  
Industrial Cities ◽  
Swept Area

This article highlights how vertical-axis turbines may avoid the limitations of today’s standard propeller-like machines. Horizontal-axis wind turbine technology is likely to peak in the next few years, largely because of the limitations of the blades and their effects on the machine. The power output of a wind turbine is directly related to the swept area of its blades. The larger the diameter, the more power it is capable of extracting from the wind. The larger the blades, the stronger they need to be to withstand the higher levels of centrifugal force and stresses caused by their additional size and weight. Tall masonry structures of the sort that are suitable for the Eurowind turbines were once a common sight in industrial cities and towns across the globe. However, as technology changed, many of these structures became obsolete. Indeed, the structures have lent their name to an entire subset of old-fashioned, low-tech businesses in smokestack industries.

Configuration Analysis and Design of a Wind Turbine With Hydrostatic Transmission System

2016 ◽  
Author(s):  
Majid Deldar ◽  
Afshin Izadian ◽  
Sohel Anwar
Keyword(s):  
Wind Turbine ◽  
Wind Power ◽  
High Efficiency ◽  
Transmission System ◽  
Analysis And Design ◽  
Hydrostatic Transmission ◽  
Partial Load ◽  
And Performance ◽  
Swept Area ◽  
Circuit Configuration

This paper presents a methodology for designing and dimensioning of hydrostatic transmission system (HTS) configurations for wind turbines. HTS provides an alternative method to the gearbox in wind power applications. It decouples the turbine and the generator such that the generator can be driven at synchronous speed regardless of wind speed variation. A comparison of different HTS configurations shows that the functionality and performance of the proposed system depends on proper dimensioning of hydraulic components and the circuit configuration. Practical constraints of wind turbine and hydraulic technologies are considered in the design to configure an industrial scale system. The design objectives include obtaining the maximum system efficiency at the rated and high efficiency at partial load. Different hydrostatic systems were designed and simulated to show potentials for improving the overall efficiency of wind power using HTS. It was shown that the larger swept area and moderate speed generator improve efficiency of hydrostatic drivetrain. Optimization of the entire HTSWT can improve output power from a HTSWT to an extent that its annual energy production (AEP) becomes closely equal to AEP of a geared WT.

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