Experimental investigation into the influence of the flanged diffuser on the dynamic behavior of CFRP blade of a shrouded wind turbine

Wang, Wen Xue; Matsubara, Terutake; Hu, Jiangqi; Odahara, Satoru; Nagai, T.; Karasutani, Takashi; Ohya, Yuji

doi:10.1016/j.renene.2015.01.028

Cited by 66 publications

(35 citation statements)

References 18 publications

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“…The idea of bringing a wind energy system into urban areas is more challenging because of limited available space and the adaptation of the wind turbine to the existing infrastructure. Many researchers have proposed ideas of wind energy systems that can possibly be installed in urban settings for local energy generation [11][12][13][14]. These systems feature additional augmentation systems, either utilizing the building geometry or retrofitted onto the building or a combination of these.…”

Section: Introductionmentioning

confidence: 99%

Design and Experimental Analysis of an Exhaust Air Energy Recovery Wind Turbine Generator

et al. 2015

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A vertical axis wind turbine (VAWT) was positioned at the discharge outlet of a cooling tower electricity generator. To avoid a negative impact on the performance of the cooling tower and to optimize the turbine performance, the determination of the VAWT position in the discharge wind stream was conducted by experiment. The preferable VAWT position is where the higher wind velocity matches the positive torque area of the turbine rotation. With the proper matching among the VAWT configurations (blade number, airfoil type, operating tip-speed-ratio, etc.) and exhaust air profile, the turbine system was not only able to recover the wasted kinetic energy, it also reduced the fan motor power consumption by 4.5% and increased the cooling tower intake air flow-rate by 11%. The VAWT had a free running rotational speed of 479 rpm, power coefficient of 10.6%, and tip-speed-ratio of 1.88. The double multiple stream tube theory was used to explain the VAWT behavior in the non-uniform wind stream. For the actual size of a cooling tower with a 2.4 m outlet diameter and powered by a 7.5 kW fan motor, it was estimated that a system with two VAWTs (side-by-side) can generate 1 kW of power which is equivalent to 13% of energy recovery. OPEN ACCESSEnergies 2015, 8 6567

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Section: Introductionmentioning

confidence: 99%

Design and Experimental Analysis of an Exhaust Air Energy Recovery Wind Turbine Generator

et al. 2015

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“…The flowchart of the iterative calculations of fluid-structure coupling is described in Figure 6. It is noted that, in general, the exact pressure acting on the flexible flange is quite complicated due to the interaction between the fluid and deformation of the flange and fluctuates around its mean value over time [20,22]. The pressure distribution on the flange near the outer and inner boundary of the flange is not uniform due to the influence of boundary conditions.…”

Section: Numerical Simulationsmentioning

confidence: 99%

“…The pressure distribution on the flange near the outer and inner boundary of the flange is not uniform due to the influence of boundary conditions. However, on the other hand, according to the recent wind tunnel experiments [20], the fluctuation of total pressure acting on a flexible plate is about 5% of the mean pressure if the plate has the proper flexure rigidity. The regions with abrupt pressure change near the outer and inner diameters of the flange are about 5.3% and 6.7%, respectively, of the whole area of the plate surface so that the influence of non-uniform pressure on the deformation of the plate is limited.…”

Section: Numerical Simulationsmentioning

confidence: 99%

“…In addition to the above research in the flow field around the flanged diffuser, the influence of flanged diffuser on the dynamic behavior of rotating rotor blades of a 3 kW wind turbine with a compact flanged diffuser was investigated by wind tunnel experiments in a recent work [20]. It was found that the rotational speed of the blade of the wind turbine with a flanged diffuser is about 1.35 times that without the flanged diffuser, which led to higher strains at the root of the rotating blades of the wind turbine with a flanged diffuser than those in the rotating blades of the bare wind turbine with the same rotor.…”

Section: Introductionmentioning

confidence: 99%

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Upgrading a Shrouded Wind Turbine with a Self-Adaptive Flanged Diffuser

Wang

2015

Energies

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In this paper, a self-adaptive flange is proposed for the wind turbine shrouded by a flanged diffuser to reduce the wind loads acting on the flanged diffuser at high wind velocities. The self-adaptive flange can maintain the advantages of the flanged diffuser at wind velocities lower than the rated velocity and reduce the wind loads acting on the diffuser and blades at higher wind velocities. Numerical analyses of fluid-structure interactions are carried out to investigate the flow field around the diffuser with a self-adaptive flange and the variation of wind load acting on the diffuser due to the reconfiguration of the self-adaptive flange at various wind velocities. Numerical results show that the wind load acting on the total flanged diffuser can be reduced by about 35% at 60 m/s due to the reconfiguration of the self-adaptive flange.

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“…Wang et al [6] measured the influence of a flanged diffuser on a shrouded wind turbine. Their experimental results revealed that the rotational speed and the dynamic strain of the blade are much higher than those without a flanged diffuser.…”

Section: Introductionmentioning

confidence: 99%