What is the damping coefficient of Well's/impulse turbine that may be introduced into a mechanical oscillation model to simulate the PTO damping?

01 February 2021 1 7K Report

In tank experiments, it is easy to simulate the PTO damping by the use of orifices, however in modeling full scale and real conditions the trurbine damping coefficient must be added to the water colunm damping of unloaded OWC to simulate the pneumatic power before introducing the conversion efficiency of the turbine... so, what is the normal damping coefficient (value) of well's or impulse that is used for power calculations?

Mohamed-Mourad Lafifi

Dear Seif Bayoumi,

If the damping is set too low, the oscillator will move too much with regards to the wave and little power will be extracted. In the same way, if the damping is too high, the amplitude of the motion will be limited, resulting in low power extraction. Hence, appropriate damping on the PTO system is fundamental.

In case of Passive Loading Control, the damping coefficient is defined as the ratio of the force to velocity for linear motions, or torque to angular velocity for rotating motions. The damping coefficient is frequency dependent and can be either determined numerically or derived from experimental tank testing. This control strategy corresponds to adjusting the damping coefficient provided by the PTO system for a given sea state condition.

For more details and information about this subject, i suggest you to see links and attached files on topic.

https://vtechworks.lib.vt.edu/bitstream/handle/10919/98782/Afonja_AJ_T_2020.pdf?sequence=1&isAllowed=y

http://www.diva-portal.org/smash/get/diva2:922655/FULLTEXT01.pdf

https://www.sciencedirect.com/topics/earth-and-planetary-sciences/oscillating-water-column

Article A review of impulse turbine for wave energy conversion

Article Wave-to-Wire Model of an Oscillating-Water-Column Wave Energ...

Article Implementation and Verification of a Wave-to-Wire Model of a...

Article Performance of OWC wave energy converters: Influence of turb...

Best regards

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