Influence of tilt angle and the number of guide vane blades towards the Savonius rotor performance

Yahya, Waled; Kou, Ziming; Wu, Juan; Qurashi, Muhammad Saqlain; Al-Nehari, Mohammed; Salim, Elsadic

doi:10.1016/j.egyr.2021.05.053

Cited by 28 publications

(13 citation statements)

References 39 publications

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“…In addition, the majority of designed water turbine deflectors are not directional and only work in the stream direction. Therefore, this study aims to make a CFD analysis for a novel, close-ended, guided deflector to increase the water velocity and improve vertical turbines, like the Savonius, which is widely known for its poor performance [29][30][31].…”

Section: The State Of the Artmentioning

confidence: 99%

A CFD Analysis for Novel Close-Ended Deflector for Vertical Water Turbines

et al. 2022

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The effects of climate change are growing more and more evident, and this is caused by the increase in CO2 emissions. Fossil fuel exhaustion and the need for electricity in remote areas have encouraged researchers to advance and develop the renewable energy sector. One type of clean energy technology is vertical water turbines that have low efficiency. This paper aims to design and simulate a novel close-ended, guided deflector to improve the efficiency of vertical turbines. This research used the dynamic mesh technique to evaluate the concept after the deflector was designed, and a grid independence study, a boundary sensitivity study, and a timestep sensitivity study were implemented to ensure the accuracy of the results. Then, we used the sliding mesh model to determine the performance of four rotors. The results from the dynamic mesh model showed that the straight rotor with the proposed deflector was not suitable for operating in the deflector, and the concept is static and does not rotate. However, the others showed a valid concept in the proposed deflector. For the sliding mesh technique, the results indicated a common trend: all the rotors’ performances increased when tip speed ratio (TSR) increased, and the highest amount of the power coefficient (Cp) was found at higher TSRs, such as 1.3 and 1.4, with around 0.45 in the cross flow type. A three-dimensional simulation was conducted of the cross flow type with the proposed deflector, and a similar trend was found. Nevertheless, around a 5% difference was found between the 3D and 2D results for cross flow. The deflector can significantly improve the performance after 0.7 TSR to reach over 0.42 Cp at 1.3 TSR, whereas, without the deflector, the performance reduces to approximately 0.1 Cp at the same TSR.

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Section: The State Of the Artmentioning

confidence: 99%

A CFD Analysis for Novel Close-Ended Deflector for Vertical Water Turbines

et al. 2022

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“…A heat exchanger 15 is installed in a container with a heat-transfer fluid 6, the inlet into the heat exchanger is hydraulically connected with an outlet of the circulating pump 11, and the outlet is connected with the consumer 16 of the generated heat energy, for example with a radiator of a hot-water heating. A starting Savonius rotor (Yahya et al, 2021) is tightly joined to the hub 2.…”

Section: Fig 1 -Wind Mechanical Plant For Generating Heatmentioning

confidence: 99%

Theoretical Investigation of Heat Production Feasibility by Means of Wind Mechanical Plants

Holovko

Volodimir²,

Mikola³

et al. 2021

INMATEH

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A widespread use of wind turbines can fully or partly provide energy for the consumers, but with due regards to certain investments and instability of energy generation. Technologies of using wind energy imply the conversion of the mechanical energy of a wind flow into the electrical or heat energy. The work is concerned with the estimation of the amount of heat in the process of heating liquid coolants and heat-transfer fluids when using wind mechanical plants. In the paper was made a numerical analysis of the temperature rise of the liquid which circulates in a closed loop of a gear-type pump, whose productivity is 3 l/m and which is driven by a wind turbine 5 kW of power capacity under a nominal wind speed of 7 m/s and under cycle duration of 2 s. The analysis showed that the temperature increased by 0.290 °К/s. If such wind speed is observed during one hour, the temperature of 100 kg of water will increase by 8.1°С. Heating of a heat-transfer fluid with a supply of mechanical energy to a working part can be achieved by a centrifugal fan. Assuming that the given process occurs without supplying and removing heat energy (it is adiabatic), for the capacity of 1.5 kW and under the revolution in a range of 1000….3000 r/m, the changes in temperature will range from 0.38 to 0.87 °К/s, but for the capacity of 7.5 kW and under 750 – 1500 r/m, the changes in temperature will range from 0.56 to 1.23 °К/s.

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“…Considering the studies in the literature; It has been determined that the changes made in the rotor structure are generally classified as blade type, number of blades, and blade design dimension ratios [5][6][7][8]. In another method to increase rotor performance, rotor performances have been investigated by adding an additional performance setup in front of the rotor without making any changes in the rotor structure [9][10][11]. In this second method, it is ensured that especially the flow is directed on the positive-torque producing blade, and thus the negative-torque on the rotor is reduced.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of the performance of vertical axis wind rotors with straight blades

Altan

2023

European Mechanical Science

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In this study, it has been aimed to improve the performance of vertical axis wind rotors with straight blades. For this purpose, an additional performance-enhancing setup has been used, placed in front of the vertical axis wind rotor with straight blades, in order to increase the performance. The effects on the rotor performance increase have been investigated numerically by keeping the dimensions of this performance-enhancing additional setup constant, by changing the number of blades of the straight bladed rotor and by changing the blade angles if the straight blades have been angled. Numerical analyzes performed in this study have been validated by experimental literature data. After creating the solid models required for the rotor performance analysis, the computational fluid dynamics (CFD) program ANSYS Fluent has been used. Here, studies have been carried out with two, three and four bladed rotors as the number of blades. As the blade angle, the effects of the angles between 180 and 120 have been examined. As a result of the study with the additional performance setup (APS), it has been determined that the optimum performance has been obtained with the vertical axis rotor with three blades and 150 blade angle. As a final result, it has been determined that the power coefficient obtained from the optimum vertical axis rotor with additional performance setup increased approximately 2.6 times compared to the optimum rotor without setup.

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Influence of tilt angle and the number of guide vane blades towards the Savonius rotor performance

Cited by 28 publications

References 39 publications

A CFD Analysis for Novel Close-Ended Deflector for Vertical Water Turbines

A CFD Analysis for Novel Close-Ended Deflector for Vertical Water Turbines

Theoretical Investigation of Heat Production Feasibility by Means of Wind Mechanical Plants

Enhancement of the performance of vertical axis wind rotors with straight blades

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