低流速潮流能捕获机构导流装置性能研究
发布时间：2018-08-28 10:00
【摘要】：潮流能是一种不竭的清洁可再生资源,研发潮流能发电技术与装置具有重要的战略意义和显著的社会经济效益。潮流能捕获机构是潮流能发电系统的核心,叶轮是潮流能捕获机构的关键部件,在叶轮外部设置导流罩以增加潮流流速是提高叶轮获能效率的一种有效方法。在对国内外潮流能捕获机构中叶轮的各种型式进行分析的基础上,主要对导流装置的型式进行了研究,在现有内导流方法的基础上提出了外导流概念和方法。运用CFD方法及相关软件工具对三种流线型导流曲线进行了流体动力学分析,并选取圆弧形为优化导流线型,对内导流和外导流两种导流流场进行了流体动力学仿真分析。分析结果表明,内导流聚流效果明显;外导流的最大潮流增速效果为内导流的65%左右,且经过外导流后,沿垂直并在离开导流罩壁面方向的潮流速度分布呈现先递增后递减趋势,存在负获能区的叶轮可以充分利用这一特点来提高获能效率。为了验证内、外导流分析结果的正确性,基于实验室水池条件和相对运动原理,设计制造了潮流能捕获叶轮导流装置及其水动力学性能试验系统,并对水平轴和垂直轴叶轮及其导流罩的性能进行了实验测试,为进一步开展海上试验提供初步依据及技术参考。根据内、外导流原理及其性能特点,提出了一种将内、外导流集成于一体的双体船式新型导流结构,设计建造了漂浮双体船式潮流能捕获与发电、制淡综合实验平台,并基于该实验平台进行了海上试验,对船体导流效果进行了实验测试。实验测试结果表明,该双体船式导流结构的聚流效果明显,其内导流使潮流流速提高了38%,其外导流使潮流流速提高了23%,且实测导流效果与仿真导流数据吻合得较好。
[Abstract]:Power flow energy is an inexhaustible clean and renewable resource. It is of great strategic significance and significant social and economic benefits to develop power generation technology and equipment. Power flow energy capture mechanism is the core of power flow energy generation system and impeller is the key component of power flow energy capture mechanism. It is an effective method to improve the efficiency of impeller energy acquisition by setting a guide cover outside the impeller to increase the power flow velocity. Based on the analysis of various types of impellers in tidal current energy trapping mechanism at home and abroad, this paper mainly studies the types of diversion devices, and puts forward the concept and method of external diversion on the basis of existing internal diversion methods. Using the CFD method and related software tools, the hydrodynamic analysis of three kinds of streamline flow curves is carried out, and the circular arc is selected as the optimization flow guide. The hydrodynamic simulation analysis of the internal and external diversion fields is carried out. The results show that the effect of internal diversion is obvious, and the maximum tidal current growth rate of external diversion is about 65% of that of internal diversion, and after external diversion, The distribution of tidal current velocity along the vertical direction and in the direction of the direction away from the wall of the diversion cover shows a tendency of increasing first and then decreasing. The impeller with negative energy gain region can make full use of this characteristic to improve the efficiency of energy acquisition. In order to verify the correctness of the analysis results of internal and external diversion, based on the conditions of laboratory pool and the principle of relative motion, a flow guide device for capturing the power flow energy of impeller and its hydrodynamic performance test system are designed and manufactured. The performance of horizontal and vertical shaft impellers and their diversion covers are tested experimentally, which provides a preliminary basis and technical reference for further offshore tests. According to the principle of internal and external diversion and its performance characteristics, a new type of catamaran structure is proposed, which integrates internal and external diversion, and a comprehensive experimental platform is designed and constructed to capture and generate power from floating catamaran. On the basis of the experimental platform, a sea test was carried out, and the effect of ship diversion was tested. The experimental results show that the confluence effect of the catamaran diversion structure is obvious. The inner diversion increases the tidal current velocity 38%, and the external diversion increases the tidal current velocity 23%, and the measured flow diversion results agree well with the simulated diversion data.
【学位授予单位】：太原科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P743
本文编号：2209055
[Abstract]:Power flow energy is an inexhaustible clean and renewable resource. It is of great strategic significance and significant social and economic benefits to develop power generation technology and equipment. Power flow energy capture mechanism is the core of power flow energy generation system and impeller is the key component of power flow energy capture mechanism. It is an effective method to improve the efficiency of impeller energy acquisition by setting a guide cover outside the impeller to increase the power flow velocity. Based on the analysis of various types of impellers in tidal current energy trapping mechanism at home and abroad, this paper mainly studies the types of diversion devices, and puts forward the concept and method of external diversion on the basis of existing internal diversion methods. Using the CFD method and related software tools, the hydrodynamic analysis of three kinds of streamline flow curves is carried out, and the circular arc is selected as the optimization flow guide. The hydrodynamic simulation analysis of the internal and external diversion fields is carried out. The results show that the effect of internal diversion is obvious, and the maximum tidal current growth rate of external diversion is about 65% of that of internal diversion, and after external diversion, The distribution of tidal current velocity along the vertical direction and in the direction of the direction away from the wall of the diversion cover shows a tendency of increasing first and then decreasing. The impeller with negative energy gain region can make full use of this characteristic to improve the efficiency of energy acquisition. In order to verify the correctness of the analysis results of internal and external diversion, based on the conditions of laboratory pool and the principle of relative motion, a flow guide device for capturing the power flow energy of impeller and its hydrodynamic performance test system are designed and manufactured. The performance of horizontal and vertical shaft impellers and their diversion covers are tested experimentally, which provides a preliminary basis and technical reference for further offshore tests. According to the principle of internal and external diversion and its performance characteristics, a new type of catamaran structure is proposed, which integrates internal and external diversion, and a comprehensive experimental platform is designed and constructed to capture and generate power from floating catamaran. On the basis of the experimental platform, a sea test was carried out, and the effect of ship diversion was tested. The experimental results show that the confluence effect of the catamaran diversion structure is obvious. The inner diversion increases the tidal current velocity 38%, and the external diversion increases the tidal current velocity 23%, and the measured flow diversion results agree well with the simulated diversion data.
【学位授予单位】：太原科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P743
【参考文献】
相关硕士学位论文 前1条
1 陈存福;潮流能水平轴水轮机叶片优化及水动力性能研究[D];中国海洋大学;2012年
，本文编号：2209055
本文链接：https://www.wllwen.com/kejilunwen/haiyang/2209055.html
