Numerical Analysis of Wells Turbine

Premkumar, T. Micha; Ashish,; Prakash, T. Banu; Thulasiram, D.

doi:10.4028/www.scientific.net/amm.592-594.1125

Cited by 4 publications

(3 citation statements)

References 7 publications

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“…Finite volume approach are used to discretize the Reynolds Average Navier Stokes equations with SIMPLE algorithm for pressure velocity coupling, second order central difference scheme for viscous parameter and second order scheme for convective terms. The information about the relative velocity term for rotation of turbine is similar to the explanation given in the work of Premkumar et al [8]. The 3D model, computation domain and mesh for this type of vertical axis wind turbine for CFD simulation is shown in Fig.…”

Section: Numerical Methodologymentioning

confidence: 78%

Design and Performance Prediction of Low Cost Vertical Axis Wind Turbine

Premkumar

Mohan

Seralathan

et al. 2015

AMM

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The capacity of wind power generation has increased across India due to various activities encouraged by government. Moreover, onshore potential in India is in the order of 100GW. However, the plant load factor is often very low in wind power production. In most of the place, low-rated wind speed is available. Effective utilization of the wind to produce small power will reduces the grid load. There is in need to effectively utilize the available potential to meet the energy demand. The low cost vertical axis wind turbine designed for low rated wind regime has the hybrid of simple Savonius and helical Savonius. Various experimental parameters are measured to check the suitability of the vertical axis wind turbine in the low rated wind speed regions. Numerical simulation are carried out for three dimensional steady flow around the combined Savonius and helical Savonius vertical axis wind turbine blades using ANSYS Fluent(C). Numerical investigation are conducted to study the effect of hybrid combination on performance of the rotor in terms of coefficient of torque, coefficient of power, etc. Self-starting behaviour of the vertical axis wind turbine is improved by using this hybrid vertical axis wind turbine.

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Section: Numerical Methodologymentioning

confidence: 78%

Design and Performance Prediction of Low Cost Vertical Axis Wind Turbine

Premkumar

Mohan

Seralathan

et al. 2015

AMM

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“…Due to the symmetrical profile of its blades, the Wells turbine is a self-rectifying turbine constructively simple and reliable. Many authors have studied this turbine, both numerically [4,5] and experimentally [6,7,8,9], F. Licheri, A. Climan, P. Puddu, F. Cambuli, T. Ghisu…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of a Wells Turbine with Variable Pitch Rotor Blades

et al. 2018

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District heating networks are commonly addressed in the literature as one of the most effective solutions for decreasing the greenhouse gas emissions from the building sector. These systems require high investments which are returned through the heat sales. Due to the changed climate conditions and building renovation policies, heat demand in the future could decrease, prolonging the investment return period. The main scope of this paper is to assess the feasibility of using the heat demand -outdoor temperature function for heat demand forecast. The district of Alvalade, located in Lisbon (Portugal), was used as a case study. The district is consisted of 665 buildings that vary in both construction period and typology. Three weather scenarios (low, medium, high) and three district renovation scenarios were developed (shallow, intermediate, deep). To estimate the error, obtained heat demand values were compared with results from a dynamic heat demand model, previously developed and validated by the authors. The results showed that when only weather change is considered, the margin of error could be acceptable for some applications (the error in annual demand was lower than 20% for all weather scenarios considered). However, after introducing renovation scenarios, the error value increased up to 59.5% (depending on the weather and renovation scenarios combination considered). The value of slope coefficient increased on average within the range of 3.8% up to 8% per decade, that corresponds to the decrease in the number of heating hours of 22-139h during the heating season (depending on the combination of weather and renovation scenarios considered). On the other hand, function intercept increased for 7.8-12.7% per decade (depending on the coupled scenarios). The values suggested could be used to modify the function parameters for the scenarios considered, and improve the accuracy of heat demand estimations.

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“…The effects of transition turbulence models were studied elaborately [11] by using complex S-shaped hydrofoil. The flow through the cross flow turbine is more complex to solve numerically because of more circulation and recirculation zone present in the turbine downstream [12]. The rotating vertical axis wind turbine can be modeled using both stationary and rotating frame reference method.…”

Section: Introductionmentioning

confidence: 99%

Numerical Studies on the Effect of Cambered Airfoil Blades on Self-Starting of Vertical Axis Wind Turbine Part 1: NACA 0012 and NACA 4415

Premkumar

Seralathan

Mohan

et al. 2015

AMM

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This is Part-1 of the two-part paper in considering the effect of cambered airfoil blades on self-starting of vertical axis wind turbine. Part 1 reports the numerical studies on self-starting of vertical axis wind turbine with comparative studies involving NACA 0012 and cambered airfoil NACA 4415. Part 2 of the paper deals with numerical studies of NACA 0018 and cambered air foil NACA 63415. Darrieus type VAWT is attracting many researchers attention for its inherent advantages and its diversified applications. However, a disadvantage is when the rotor is stationary, no net rotational forces arises, even at high-wind speed. The principal advantage of the vertical axis format is their ability to accept wind from any direction without yawing mechanism. However, self-starting capability is the major drawbacks. Moreover, literatures based on computational analysis involving the cambered airfoil are few only. The objective of this present study is to select the suitable airfoil blades on self-starting of VAWT at low-Reynolds number. The numerical studies are carried out to identify self-starting capability of the airfoil using CFD analysis by studying the flow field over the vertical axis wind turbine blades. The commercial CFD code, ANSYS CFX 13.0© was used for the present studies. Initially, the flow over NACA 0012 was simulated and analyzed for different angles of attacks and similarly carried out for NACA 4415. The contours of static pressure distribution and velocity as well as the force and torque were obtained. Even though the lift force for cambered airfoil NACA 4415 is higher, based on the torque values of the above blade profiles, asymmetrical airfoil NACA 0012 is found to be appropriate for self-starring of VAWT.

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Numerical Analysis of Wells Turbine

Cited by 4 publications

References 7 publications

Design and Performance Prediction of Low Cost Vertical Axis Wind Turbine

Design and Performance Prediction of Low Cost Vertical Axis Wind Turbine

Numerical Study of a Wells Turbine with Variable Pitch Rotor Blades

Numerical Studies on the Effect of Cambered Airfoil Blades on Self-Starting of Vertical Axis Wind Turbine Part 1: NACA 0012 and NACA 4415

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