The Experimental Study On Flow Induced Vibration Characteristics For T Oscillator

Flow induced vibration widely exist in ocean engineering?aviation engineering and large span bridge construction and other fields of engineering,and it often causes the offshore platform and buildings such as bridge tall chimneys break.So engineering research is often suppress it.But with the deepening of the study,the researchers found that the flow induced vibration can be used as a way to take advantage of energy conversion.And with the new clean energy development and utilization,the flow induced vibration is gradually applied in the development and utilization of ocean currents.And the characteristics of flow induced vibration and stator section form has closely linked,so the research purpose of this paper is to study the flow induced vibration of T oscillator experimental.The main research contents and results were as follows:1.This article has carried on the multiple sets of T oscillator flow induced vibration experiment,and analyzed its flow vibration characteristics and laws and compared with cylindrical oscillator and tri-prism oscillator:T section vibrator showed"unlimited"characteristics in the flow induced vibration,and with the increase of velocity continuously the vibration grew into galloping.The maximum response amplitude ratio A~*=2.52 of T section vibrator,higher than the existing cylindrical vortex-induced vibration test results which the maximum amplitude ratio of A~*=1.90;T section vibrator was suitable for the condition of energy absorbing in high velocity for the large amplitudes,frequency stability and the characteristic s of"unlimited"of flow induced vibration.But the cylinder oscillator is still dominant under the condition of low velocity for the energy absorbing.2.We used the circulation channel to do the flow induced vibration experiment for T section oscillator under different system damping,and analyzed the flow induced vibration characteristic and rule under different system damping of T section oscillator:increasing damping would reduce the vibration strength of T section oscillator,in experimental conditions of this paper,when the damping ratio of?<0.197,oscillator can realize the transform from vortex vibration to galloping with self-excitation,but when damping ratio?>0.197,cannot achieve the transform from vortex vibration to galloping with self-excitation and only showed the vortex-induced vibration phenomena of the"limited".3.We had experimental study on flow induced vibration of T section oscillator with different height to width ratio was set,and analyzed the influence of the T section oscillator height to width ratio on the flow induced vibration characteristics:the T section oscillator height to width ratio with the response amplitude ratio and frequency ratio are inversely proportional relationship,namely reducing T section oscillator height to width ratio can improve the amplitude and frequency of the vibrator when the vibrator in the stable vibration mode(galloping),is conducive to the power generation efficiency of the flow induced vibration generating device.The research results for T section oscillator to the investigation of the rule of flow induced vibration characteristics,the influence of system damping and height to width ratio on flow induced vibration of the T section oscillator,and provides a new train of thought to improve the flow induced vibration power oscillator section optimization research.