| China has huge ocean wave energy reserves,but there are many restrictions in the energy conversion process,and the existing wave energy power generation devices have certain limitations.In the existing offshore platforms,a tuned liquid column damper is often added to absorb the energy of the platform movement during the vibration damping process,and produce a stable reciprocating oscillating movement of the liquid column with a large amplitude.The energy contained in this stable and regular fluid movement has a very broad application prospect.The Wells turbine is added to the structure,so that the floating platform motion suppression system has the function of electric energy conversion.This kind of motion suppression system with active control realizes the overall suppression of the overall motion of the floating platform under complex sea conditions through self-powered.First,based on the CFD computational fluid dynamics numerical simulation method,the numerical simulation is realized by solving the RANS equation and the Spalart-Allmaras model.Based on the FLUENT software,the sensitivity analysis of the Wells turbine performance is carried out by changing the flow velocity,speed,outer diameter clearance and the number of blades.,Explore the turbine mechanism with optimal parameters;Secondly,the performance of Wells turbine in steady flow,oscillating flow and reciprocating flow is calculated and compared,a quasi-static analysis method of Wells turbine under unsteady flow is proposed,and the influence of the incoming flow period of unsteady flow on the performance of Wells turbine is explored,To determine the incoming flow cycle that can maximize the performance of the turbine;Then,a tension leg platform model with power generation function is proposed.Based on the theory of multi-body dynamics,the finite displacement of the platform body,instantaneous wet surface,instantaneous position,six-degree-of-freedom kinematic coupling,free surface effect and viscous force,and air compression are considered.Establish a new system coupling dynamic equation,calculate the dynamic response of the new tension leg platform under design sea conditions,and analyze whether it meets the requirements of oil and gas production operations;Finally,the dynamic response of the new system under different operating conditions,different wave angles,and different throttle orifice opening rates is calculated and analyzed,and the stability of its motion performance is explored.Output the power generation of the new system under different working conditions,explore its hydrodynamic characteristics and power generation performance,and provide design references for the design of multifunctional floating platforms and the development of ocean wave energy.This paper aims to study the aerodynamic performance of Wells turbines under different flow conditions and different geometric parameters,and to verify the feasibility of the new floating platform system with power generation functions.At the same time,through the simulation of the power generation performance of the new system,it provides a design reference for the design of the multifunctional floating platform and the development of ocean wave energy. |
PDF Full Text Request