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Unlike HAWTs, the rotor blades for VAWTs do not always provide positive torque during operation.
The negative torque zone has been minimized thus the positive torque that provides higher power can be obtained.
The flow separation is significantly controlled in the azimuth angle ranges from 75° to 160°, where the positive torque generation is also found to be considerably increased in the improved turbine model.
Through adjusting wind direction, the tower cowling can make more wind forcing on the inner part of blades which produce positive torque, and prevent wind from forcing on outer part of blades which produce negative torque.
The prevented wind was guided in different designs to impinge the concave side of the return blade and hence to eliminate the negative torque and increase the exerted positive torque.
In contrast to the other teeth, the central incisors displayed a positive torque (Table 7).
Similar(48)
Joint torque was defined such that positive torques caused extension of the joint and negative torques caused flexion of the joint.
It is found that the hybrid design fully exhibits self-starting capability at all azimuthal positions, signified by the positive static torque coefficient values.
However, we cannot prove that the generator having positive damping torque coefficient will never be the oscillation source in any way, so the damping torque based methods may possibly give wrong location results [33].
Sawada et al.[3] studied the mechanism of rotation of a Savonius rotor with two semi-cylindrical blades and found that a rotor with a gap ratio of 0.21 produces positive static torque at all angles.
Regions of positive and negative torque values demonstrated how the fluid interacts with the rod, a phenomenon apparently related to the occurrence of secondary flows in the metering nip.
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