scholarly journals CFD Analysis of Torque and Power for Single Rotor, Dual Rotor, and Ducted Dual Rotor Wind Turbine

2021 ◽  
Vol 10 (4) ◽  
pp. 215-219
Author(s):  
Vinay Mishra ◽  
H.K. Paliwal
Keyword(s):  
Comparative Study ◽  
Wind Turbine ◽  
Wind Velocity ◽  
Horizontal Axis ◽  
Cfd Analysis ◽  
Maximum Value ◽  
High Torque ◽  
The Comparative Study ◽  
Rotor Type ◽  
Better Than

With the present advancement, a wind turbine needs a wind rotor with high torque and power. The present study aims to enhance the torque and power of wind turbine by employing the ducted dual rotor. In this regard, CFD analysis is performed to analyze the torque and power produced for horizontal axis single rotor bare wind turbine, dual rotor wind turbine, and convergent-divergent ducted type dual rotor wind turbine. The comparative study is conducted to enhance the power and torque for the aforementioned rotor type. The results highlight the maximum value of torque for a dual ducted wind turbine is 36.9% more than a dual rotor at 16 m/s of wind velocity and 92.2 % more than a single rotor at 16 m/s of wind velocity, and the maximum value of the power produced for a dual ducted wind turbine is 40.48% more than a dual rotor at 16 m/s of wind velocity and 139.66% more than a single rotor at 16 m/s of wind velocity. Therefore result suggested that a dual ducted wind turbine is better than a single rotor wind turbine.

POVERTY REDUCTION IN CHINA AND INDIA: A COMPARATIVE STUDY

2020 ◽  
Vol 65 (supp01) ◽  
pp. 95-115
Author(s):  
TONGJIN ZHANG ◽  
YUAN ZHANG ◽  
GUANGHUA WAN ◽  
HAITAO WU
Keyword(s):  
Comparative Study ◽  
Development Strategy ◽  
Rural Areas ◽  
Poverty Reduction ◽  
Rural China ◽  
Agricultural Labor ◽  
China And India ◽  
Employment Generation ◽  
The Comparative Study ◽  
Better Than

This paper attempts to explain why China performed better than India in reducing poverty. As two of the most populous countries in the world, China and India have both experienced fast economic growth and high inequality in the past four decades. Conversely, China adopted a more export-oriented development strategy, resulting in faster industrialization or urbanization and deeper globalization, than India. Consequently, to conduct the comparative study, we first decompose poverty changes into a growth and an inequality components, assessing the relative importance of growth versus distributional changes on poverty in China and India. Then, Chinese data are used to estimate the impacts of industrialization, urbanization and globalization on poverty reduction in rural China. The major conclusion of this comparative study is that developing countries must prioritize employment generation in secondary and tertiary industries through industrialization and globalization in order to absorb surplus agricultural labor, helping reduce poverty in the rural areas.

Arsenic hyperaccumulation by Pteris vittata and Pityrogramma calomelanos: a comparative study of uptake efficiency in arsenic-treated soils and waters

2010 ◽  
Vol 61 (12) ◽  
pp. 3041-3049 ◽  
Author(s):  
J. W. H. Yong ◽  
S. N. Tan ◽  
Y. F. Ng ◽  
K. K. K. Low ◽  
S. F. Peh ◽  
...  
Keyword(s):  
Comparative Study ◽  
Continuous Flow ◽  
Dry Weight ◽  
Pteris Vittata ◽  
Uptake Efficiency ◽  
Fern Species ◽  
Arsenic Hyperaccumulation ◽  
The Comparative Study ◽  
Pityrogramma Calomelanos ◽  
Better Than

This work comprised of the comparative study of arsenic (As) uptake efficiency by Pteris vittata and Pityrogramma calomelanos grown in (i) As amended soils (0–600 ppm) and (ii) As tainted water (40 ppb) using a new compact continuous flow phytofiltration system in a tropical greenhouse. The As hyperaccumulation efficiency was dependent on the growth medium for the two fern species. The highest level of As detected in the fronds of P. vittata was 19,300 ± 190 ppm (dry weight basis) and 11,600 ± 230 ppm for Pityrogramma calomelanos, after growing for 78 days in soils amended with As. In the compact continuous flow As phytofiltration system experiments, Pityrogramma calomelanos was found to perform better than P. vittata in phytofiltrating As contaminated water under waterlogged conditions. During the 167 h of phytofiltration experiment, the removal efficiency was approximately 99% and 67% for Pityrogramma calomelanos and P. vittata systems respectively, based on an initial 40 ppb As. Pityrogramma calomelanos also required a shorter acclimatization time than P. vittata under waterlogged conditions.

scholarly journals THE EFFECT OF DARRIEUS AND SAVONIUS WIND TURBINES POSITION ON THE PERFORMANCE OF THE HYBRID WIND TURBINE AT LOW WIND SPEED

2020 ◽  
Author(s):  
Nawfal M. Ali ◽  
Abdul Hassan A. K ◽  
Sattar Aljabair
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Wind Velocity ◽  
Vertical Axis ◽  
Aerodynamic Characteristics ◽  
The Other ◽  
Vertical Axis Wind Turbine ◽  
Low Wind Speed ◽  
Turbine Model ◽  
Better Than

This paper presents an experimental and numerical simulation to investigate a hybrid vertical axis wind turbine model highly efficient which can be worked at low wind speed by studying the aerodynamic characteristics of four models of hybrid VAWTs. The hybrid WT consists of the SWT having two blades and the DWT type straight having two blades. Four models were constructed to study experimentally and numerically to choose the best model. Two models were DWT in the upper and SWT in the lower, also two models were SWT in the upper and DWT in the lower. The phase stage angle between the turbines is 0o and 90o . The experimental and numerical results showed that the performance of hybrid WT where DWT in the upper and SWT in the lower with phase stage 90o is better than in the other models, it can be started to work at a wind velocity of 2.2 m/s. At the wind velocity 3 m/s, the values of the parameters are the rotational speed (198 rpm), the CP (0.3195), the CT (0.2003), the TSR (1.6) and self-starting rotation at this value of wind velocity (3 m/s). The efficiency of extracting the wind power by hybrid WT is (51.2 %).

Parametric CFD analysis of the taper ratio effects of a winglet on the performance of a Horizontal Axis Wind Turbine

2021 ◽  
Vol 47 ◽  
pp. 101489
Author(s):  
Daniel Garcia-Ribeiro ◽  
Juan A. Flores-Mezarina ◽  
Pedro D. Bravo-Mosquera ◽  
Hernan D. Cerón-Muñoz
Keyword(s):  
Wind Turbine ◽  
Horizontal Axis ◽  
Cfd Analysis ◽  
Horizontal Axis Wind Turbine

Iterative Model for the Performance Evaluation of a Horizontal Axis Wind Turbine

2002 ◽  
Vol 26 (2) ◽  
pp. 109-116
Author(s):  
Sadhan Mahapatra ◽  
Subhasis Neogi
Keyword(s):  
Performance Evaluation ◽  
Numerical Model ◽  
Wind Turbine ◽  
Horizontal Axis ◽  
Speed Ratio ◽  
Horizontal Axis Wind Turbine ◽  
Tip Speed Ratio ◽  
Iterative Model ◽  
Flow Parameters ◽  
Maximum Value

This paper is based on the studies made on a numerical model for calculating the turbine characteristics at low tip speed ratio for a Horizontal Axis Wind Turbine. The turbine characteristics are analysed for different configurations over the total operating range i.e. from tip speed ratio of zero to a maximum value where CP becomes zero. The simulation model provides acceptable results, however for the blade position near the hub, a non-convergent situation is observed i.e. the flow parameters converge to values outside those associated with turbine operation. This indicates the possibility of a multisolution.

scholarly journals Comparative study: Pitch angle variation for making power curve and search maximum power of horizontal axis wind turbine

2020 ◽  
Author(s):  
Langlang Gumilar ◽  
Arif Nur Afandi ◽  
Quota Alief Sias ◽  
Wahyu Sapto Nugroho ◽  
Mokhammad Sholeh ◽  
...  
Keyword(s):  
Comparative Study ◽  
Wind Turbine ◽  
Pitch Angle ◽  
Horizontal Axis ◽  
Maximum Power ◽  
Power Curve ◽  
Horizontal Axis Wind Turbine ◽  
Angle Variation
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