Study On Gravitational Horizontal Axis Conversion Device Design Of Tidal Current Energy

Power device of ocean renewable Tidal Current Energy (TCE) is rapidly developing ontecnology and engineering, but the method of overall design and performance design ofdevice is less studied which will not be suibtable the requirements of tecnology application.Based on the exploitation of gravitational horizontal axis conversion device, this paperresearch on the overall design, fluid dynamic performane and load, strength and stabil ity ofthe supporting structure, as well as optimized selection based on the analysis results. Thiswill provide a theoretical foundation and technical support for the overall design of TCEplant in the future.The tidal current turbine classifications overseas research status were described in thepaper and power plant trends of TCE was pointed out. Overall design concept of horizontalaxis TCE plant was classified and their advantages and disadvantages were summarized.Then engineering design methods TCE power was discussed and design processes wasintroduced. Main dimensions and overall plant of Ducted TCE diversion device rotor.Besides, then hydrodynamic loads were computed based on computational fluid dynamicsand environmental load computational theory of marine engineering structures.Hydrodynamic performances of the rotor were analyzed using CFD, flow loads of ductedand non-ducted rotor were given and current load on support structure was estimated basedon marine engineering experience equation. Preliminary design of the support structure wasput forward based on load and flow characteristics, performances of3support designschemes in limit load case were analyzed and structural performances were evaluatedaccording to the relevant norms of marine engineering structures. Finally, stability analysiswas carried out from overturning and drifting. The results showed that: the quadrilateralbase support structure is easier to meet the strength and deformation demands, whiletriangular base is economic and east to handle. At the same time triangular base can byachieve the optimal solution by adjusting the ratio of ballast components. In summary, thetriangle base support structure is the best option.This work in the horizontal axis TCE turbine is mainly reflected in presenting TCEdevices overall design method, proposing innovative forms of removable seat-bottom design based on the actual engineering conditions, and putting forward optimized selectionthrough structural strength and stability studies, to solve many problems in the automaticreversing maintenance and installation of TCE power plant, to provide an importantreference for large-scale tidal current development in the future. The research achievementof this paper has applied in the “HaiMing-I” manufacture which is a10kW TEC powerdevice studied by Harbin Engineering University.