Experimental Study of the Aerodynamics of Sail in Natural Wind

Zeng, Xin; Zhang, Huawu

doi:10.2478/pomr-2018-0068

Cited by 6 publications

(5 citation statements)

References 11 publications

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“…Figure 6A illustrates the force and torque coordinate system of the balance, which rotates along with the balance itself. The wind turbine placed on the wind tunnel balance experiences an aerodynamic force that can be decomposed into two components: the lift force F L , which is perpendicular to the incoming flow, and the drag force F d , which is parallel to the incoming flow (Zeng and Zhang, 2018). Figure 6B demonstrates the lift force F L , drag force F d and torque My along the Y-axis of the wind tunnel.…”

Section: Aerodynamic Characteristics Testmentioning

confidence: 99%

Wind tunnel experimental study on static aerodynamic performance of SB-VAWT without intermediate support axes

Zhang,

2023

Front. Energy Res.

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Wind power generation is considered an effective way for ships to harness wind energy, and the aerodynamic characteristics of wind turbines determine wind energy utilization and efficiency. However, traditional vertical axis wind turbines have intermediate shafts and support rods, which result in large negative effects in the research of the wind turbine aerodynamic characteristics. To address this issue, a Straight-Bladed Vertical Axis Wind Turbine (SB-VAWT) without intermediate support axes is proposed. The turbine can flexibly change the number of blades, rotor diameter, and installation position of blades. The static aerodynamic performance of the wind turbine with different combinations was tested in a wind tunnel laboratory at 10 m/s. The results show that the radius of the wind turbine has a greater effect on the drag coefficient for the same number of blades, with an inverse relationship between the drag coefficient and radius, and a positive association between lift coefficient, static torque coefficient, and radius. The drag coefficient is proportional to the number of blades at the same radius, while the static torque coefficient is inversely proportional to the number of blades. According to the results, placing the initial location in the azimuth range between 30° and 50° can obtain the maximum initial starting torque. Moreover, a wind turbine with a radius of 16 cm can achieve a higher average torque. Changes in the number of blades can significantly impact turbine properties, resulting in wind turbines with distinct features.

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Section: Aerodynamic Characteristics Testmentioning

confidence: 99%

Wind tunnel experimental study on static aerodynamic performance of SB-VAWT without intermediate support axes

Zhang,

2023

Front. Energy Res.

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“…That angle of attack that produces the most boosting force on the ship and has the least effect on the stability of the ship is an important factor in measuring the performance of the sail. 9 shows the rectangular coordinate system O-LDZ [12], with the origin O at the center of the model bottom plate, the Z-axis vertically upright, the L-axis on the horizontal plane in the direction of lift , and the D-axis in the direction of drag. Th e aerodynamic force on the sail is decomposed into a drag force F D along the incoming direction, a lift force F L perpendicular to the incoming direction, and a torque M on the mast, with the reference point of the moment being the origin O.…”

Section: Sailing Aid and Energy Saving Applicationmentioning

confidence: 99%

“…Fig.9shows the rectangular coordinate system O-LDZ[12], with the origin O at the center of the model bottom plate, the Z-axis vertically upright, the L-axis on the horizontal plane in the direction of lift , and the D-axis in the direction of drag. Th e aerodynamic force on the sail is decomposed into a drag force F D along the incoming direction, a lift force F L perpendicular to the incoming direction, and a torque M on the mast, with the reference point of the moment being the origin O.According to the force analysis in Fig.8, the boosting force produced by the sail on the boat is[13]:…”

mentioning

confidence: 99%

Wind Tunnel Experiment of Multi-Mode ARC Sail Device

Zhang

Jia-ju

2021

Polish Maritime Research

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A ship’s wind energy utilization device with multi-mode arc-shaped sails is designed, which have different working modes for sail-assisting or wind power generation according to the ship’s navigation. The structural characteristics and working principles of this device are firstly described in this paper. Three sets of arc-shaped sails with different thickness (4.5 cm, 11.3 cm, 21.7 cm) were designed. Wind tunnel experiments were carried out in the respects of sail-assisting performance and wind-power generation to determine the best sail blade shape and to verify the energy-saving effect of this device. Experiments show that the sail with the smallest thickness (4.5 cm) has a better boosting effect than others, and the sail with the largest thickness (21.7 cm) has the best wind power generation performance. Considering the lateral force and the structural strength of the support, in the case of the comprehensive evaluation for the boosting and power generation performance, it is considered that the intermediate thickness (11.3 cm) is the best choice. The device has a good comprehensive energy utilization effect and has development and application value.

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“…Data on distributed pressure and aerodynamic forces were obtained. In [11], tests were carried out to determine the aerodynamic coefficients of the sail in a wind tunnel based on a stable wind field and a simulated natural wind field. The results show that for a more accurate analysis of the aerodynamic characteristics of the sail, one cannot neglect the natural variations of the wind speed and the wind profile in the atmospheric boundary layer.…”

Section: Introductionmentioning

confidence: 99%

Mathematical modeling of the aerodynamic coefficients of a sail blade

et al. 2023

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The authors of the work numerically studied the aerodynamic coefficients of the sail blade, during which the patterns of three-dimensional flow around airflow and the pressure distribution field were obtained. The triangular sail blade is used as the power element of wind turbines. The sail blade modeling was based on the Reynolds-averaged Navier–Stokes equations (RANS) using the ANSYS FLUENT computer program. A flow pattern is obtained, which gives a physical explanation of the nature of the airflow around the sail blade and the pressure distribution field. Comparative analyses of theory and experiment are given. In the range of Reynolds numbers from 0.5 × 104 to 2.5 × 104, the change in the drag force coefficient is from 1.04 to 0.54, and the difference in the lift force coefficient is from 0.52 to 0.33.

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Experimental Study of the Aerodynamics of Sail in Natural Wind

Cited by 6 publications

References 11 publications

Wind tunnel experimental study on static aerodynamic performance of SB-VAWT without intermediate support axes

Wind tunnel experimental study on static aerodynamic performance of SB-VAWT without intermediate support axes

Wind Tunnel Experiment of Multi-Mode ARC Sail Device

Mathematical modeling of the aerodynamic coefficients of a sail blade

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