The Influence of Guide Vane to the Performance of Cross-Flow Wind Turbine on Waste Energy Harvesting System

The purpose of this experiment is to know the influence of a single guide vane position and angle to the performance of a cross-flow wind turbine. The cross-flow wind turbine was positioned at the discharge outlet of a cooling tower model to harness the discharged wind for electricity generation. A guide vane was used to enhance the rotational speed of the turbines for power augmentation. Various position and angle of attack of the guide vane were tested in this experiment. To avoid negative impact on the performance of the cooling tower fan and to optimize the wind turbine performance, the turbine position on the discharge wind stream was also studied. The result showed that cross-flow wind turbine with a guide vane attached at the right position had a higher coefficient of power than cross flow turbine without guide vane. A crossflow wind turbine with the guide vane at the position of 150 mm from the center and 30° angles had the highest coefficient of power of 0.49. Comparing to the wind turbine without guide vane, the coefficient of power of the cross-flow wind turbine was increased about 84.3%.

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Experimental tests of the effect of rotor diameter ratio and blade number to the cross-flow wind turbine performance

10.1063/1.5024101 ◽

2018 ◽

Author(s):

Sandi Susanto ◽

Dominicus Danardono Dwi Prija Tjahjana ◽

Budi Santoso

Keyword(s):

Wind Turbine ◽

Cross Flow ◽

Experimental Tests ◽

Diameter Ratio ◽

Blade Number ◽

Turbine Performance ◽

The Cross

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Study on Performance and Flow Condition of a Cross-Flow Wind Turbine With a Symmetrical Casing

Journal of Fluids Engineering ◽

10.1115/1.4004023 ◽

2011 ◽

Vol 133 (5) ◽

Cited By ~ 4

Author(s):

Junichiro Fukutomi ◽

Toru Shigemitsu ◽

Hiroki Daito

Keyword(s):

Wind Turbine ◽

Rotational Speed ◽

Flow Condition ◽

Cross Flow ◽

Low Noise ◽

Maximum Power ◽

Power Coefficient ◽

Speed Ratio ◽

Tip Speed Ratio ◽

The Cross

A cross-flow wind turbine has a high torque coefficient at a low tip speed ratio. Therefore, it is a good candidate for use as a self-starting turbine. Furthermore, it has low noise and excellent stability; therefore, it has attracted attention from the viewpoint of applications as a small wind turbine for an urban district. However, its maximum power coefficient is extremely low (10%) as compared to that of other small wind turbines. Prevailing winds in two directions often blow in urban and coastal regions. Therefore, in order to improve the performance and the flow condition of the cross-flow rotor, a casing suitable for this sort of prevailing wind conditions is designed in this research and the effect of the casing is investigated by experimental and numerical analysis. In the experiment, a wind tunnel with a square discharge is used and main flow velocity is set as 20 m/s. A torque meter, a rotational speed pickup, and a motor are assembled with the same axis as the test wind turbine and the tip speed ratio is changeable by a rotational speed controller. The casing is set around the cross-flow rotor and flow distribution at the rotor inlet and the outlet is measured by a one-hole pitot tube. The maximum power coefficient is obtained as Cpmax = 0.19 with the casing, however Cpmax = 0.098 without the casing. It is clear that the inlet and the outlet flow condition is improved by the casing. In the present paper, in order to improve the performance of a cross-flow wind turbine, a symmetrical casing suitable for prevailing winds in two directions is proposed. Then, the performance and the internal flow condition of the cross-flow wind turbine with the casing are clarified. Furthermore, the influence of the symmetrical casing on performance is discussed and the relation between the flow condition and performance is considered.

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MATLAB Simulation and Validation of Fluid Properties in the Cross Flow Wet Cooling Tower

International Review of Mechanical Engineering (IREME) ◽

10.15866/ireme.v11i2.10984 ◽

2017 ◽

Vol 11 (2) ◽

pp. 114

Author(s):

Nandkumar Annarao Rawabawale ◽

Shivalingappa Nagappa Sapali

Keyword(s):

Cooling Tower ◽

Cross Flow ◽

Matlab Simulation ◽

Fluid Properties ◽

The Cross ◽

Simulation And Validation

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Study on Performance and Internal Flow of Cross-Flow Wind Turbine

Volume 2: Symposia, Parts A, B, and C ◽

10.1115/fedsm2003-45101 ◽

2003 ◽

Author(s):

Kazuki Takeuchi ◽

Junichiro Fukutomi ◽

Hidetoshi Kodani ◽

Hironori Horiguchi

Keyword(s):

Wind Turbine ◽

Pressure Difference ◽

Main Part ◽

Cross Flow ◽

Internal Flow ◽

Power Coefficient ◽

Construction Costs ◽

Outer Flow ◽

Output Coefficient ◽

The Cross

The wind turbine has become more popular in recent years, but on the other hand, the developments of small wind-turbine have been legging behind. Because, the energy density of wind is small, since the efficiency of the main part of a wind turbine is very low. The construction costs become comparatively high-priced. Then, the main part of this subject is to show that, by collecting and sucking out more winds, a wind turbine is made to pass many winds and the new cross-flow wind turbine that increases an output coefficient is proposed. The cross-flow wind turbine has high torque and low speed characteristics and the structure are very simple. So, it can be used in a large wind velocity region. However, even if the power coefficient is high, it is about 10%. The purpose of this paper is to show how we can improve the power coefficient by applying a casing, which has a nozzle and a diffuser. This research was made to clear up fundamental characteristics of the interaction between outer flow and inner flow. Three kinds of cross-flow wind turbines were designed. The nozzle and diffuser have been designed suitable for the performance of wind turbine. The flow simulations by CFD have been carried out for various types of casings at 20 m/s with Fluent Ver5.0. All Wind tunnel experiments were performed at 20m/s. The case of casing 2, which have plate arranged near the separation point of cylinder, also experimented. The rotor that is settled in the casing 1 shows a larger power coefficient than the case without a casing. The casing of the cross-flow turbine makes a pressure difference between inflow and outflow. The pressure difference increases the mass flow rate. Therefore much more wind passes through into the cross-flow turbine. In this experiment, the power coefficient increased 1.5 times in the case with casing. A still higher output coefficient could be obtained in the case where it is shown by the casing 2.

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Performance Improvement of Cross-Flow Turbine with a Cylindrical Cavity and Guide Wall

Journal of Fluids Engineering ◽

10.1115/1.4052046 ◽

2021 ◽

Author(s):

Naoto Ogawa ◽

Mirei Goto ◽

Shouichiro Iio ◽

Takaya Kitahora ◽

Young-Do Choi ◽

...

Keyword(s):

Performance Improvement ◽

Performance Test ◽

Guide Vane ◽

Cross Flow ◽

Maximum Efficiency ◽

Small Hydropower ◽

Turbine Efficiency ◽

Partial Load ◽

Guide Wall ◽

The Cross

Abstract The cross-flow turbine has been utilizing the development of small hydropower less than about 500kW in the world. The turbine cost is lower than the other turbines because of its smaller assembled parts and more straightforward structures. However, the maximum efficiency of the cross-flow turbine is lower than that of traditional turbines. Improving the turbine efficiency without increasing manufacturing costs is the best way to develop small hydropower in the future. This study is aiming to improve the turbine efficiency at the design point and partial load. The runner&amp;amp;#39;s outflow angle varies with turbine speed and guide vane opening in the typical cross-flow turbine. The tangential velocity component remains in the outflow in these conditions; thus, change the outflow direction along the runner&amp;amp;#39;s radial direction is helpful for performance improvement. The authors experimentally change the desirable outflow angle by attaching a cavity and a guide wall at the outside casing tip. The turbine performance test was conducted for various turbine speeds and guide vane opening. Next, flow visualization around the runner was performed. As a result, the effect of the cavity and the guide wall can be revealed. The outlet flow fields are different by attaching the cavity and the guide wall, especially between the partial and optimum load conditions.

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