基于燃气轮机可靠性的维修策略

介绍了DDG-1000级驱逐舰综合电力系统中MT-30燃气轮机发电机组概况,与已经在美国海军广泛使用的LM-2500燃气轮在运行与维修方面进行比较;讨论MT-30燃气轮机采用以基于可靠性的维修策略以及更换模块化维修方式的可行性;提出了综合持续作战电源的电力输出要求。     

浮式海上风力机运动性能和锚泊系统(英文)

The development of offshore wind farms was originally carried out in shallow water areas with fixed(seabed mounted) structures.However,countries with limited shallow water areas require innovative floating platforms to deploy wind turbines offshore in order to harness wind energy to generate electricity in deep seas.The performances of motion and mooring system dynamics are vital to designing a cost effective and durable floating platform.This paper describes a numerical model to simulate dynamic behavior of a new semi-submersible type floating offshore wind turbine(FOWT) system.The wind turbine was modeled as a wind block with a certain thrust coefficient,and the hydrodynamics and mooring system dynamics of the platform were calculated by SESAM software.The effect of change in environmental conditions on the dynamic response of the system under wave and wind loading was examined.The results indicate that the semi-submersible concept has excellent performance and SESAM could be an effective tool for floating wind turbine design and analysis.     

Structural analysis of an offshore vertical axis wind turbine composite blade experiencing an extreme wind load

The vertical axis wind turbine (VAWT) configuration has many advantages for an offshore wind turbine installation. The VAWT is omnidirectional and its rotating mechanical components can be placed close to sea level. In this paper, the structural analysis of a VAWT blade structure subject to a critical load case was investigated with two methods, an analytical model and a finite element (FE) model. It was shown that the utilisation of a composite blade topology can resist the induced flapwise loading and the material strains were contained within their allowable limits. The analytical approach was demonstrated to be a quick and accurate technique to compute the composite blade strain distribution when compared to the FE model results.     

自升式风电安装平台作业环境图谱技术应用研究

为了适应风电安装平台多机位快速作业的需求，本文利用环境图谱技术对某自升式风电安装平台进行在位作业环境适应性分析。通过对不同作业工况条件下平台的预压载能力、风暴保持能力、桩腿强度、桩靴承载能力及抗倾稳性等的关键指标校核，得到许用环境条件的组合，并生成用于指导机位操船作业的环境适应性图表。通过算例结果在实际应用中的反馈，该技术不但对实际的风电安装现场作业提供了基于工程分析的技术支持，且对现场作业能够予以切实的指导，不但提高风电安装作业安全性，而且显著提升了风电安装作业效率。     

Foundation damping for monopile supported offshore wind turbines: A review

Today, an important challenge for offshore wind energy is to design efficient and reliable offshore wind turbines (OWTs). The overall damping of OWTs plays an important role in the design process as it limits the amplitude of the OWT dynamic response at frequencies near resonance. Therefore, an accurate estimation of OWTs damping is necessary for the efficient design of these systems. The foundation damping is one of the main sources overall turbine damping and is the least well understood. This paper presents a critical review of recently published studies on foundation damping for OWTs on monopiles and explains how soil damping contributes to the total damping of OWTs. It also reviews the main methods that have been used for the estimation of foundation damping in numerical and experimental studies. In addition, the importance of damping to the OWTs fatigue life is discussed. Finally, a discussion is provided on the challenges to be overcome and recommendations for the accurate estimation of foundation damping.     

舰船燃气轮机燃气初温的热经济学优化分析

运用热经济学分析方法对燃气初温的确定进行研究,建立燃气轮机的热力学模型、涡轮叶片的寿命表达式和经济学模型;以装置每小时消耗费用为目标函数,对燃气轮机的燃气初温进行优化分析,得出优化结果。     

燃气轮机叶片实体建模

提出燃气轮机空心叶片实体建模的新方法,即采用UG软件对燃气轮机叶片进行精确实体造型,利用UG自由曲面及片体的形成、修剪、精确缝合,建立空心叶片,充分发挥transform的精确定位,结合布尔运算形成精确的叶片复杂的内部结构,为结构强度、温度场等有限元分析提供基础。     

汽轮机鼓形齿联轴器润滑油流动特性研究

鼓形齿联轴器是船舶汽轮机组轴系连接中的重要部套件,鼓形齿啮合时产生较大热量,实际运行时需通入润滑油对齿间区域进行冷却以保障鼓形齿不被烧至胶合。本文针对某汽轮机鼓形齿联轴器,对机组联轴器喷油管出口至联轴器油冷通道出口区域的流动特性进行了详细分析,研究了其润滑油冷却齿面的物理原理;并对两种不同油冷流道结构在不同喷油管进口流量下的齿面对流传热特性进行了研究,发现提高联轴器喷油管的进口流量对联轴器齿间冷却效果提升均较为显著,且改进设计的油冷流道中鼓形齿面平均对流传热系数高于原始流道约25%,冷却效果提升显著。     

自航自升式风电安装船总体设计研究

自航自升式风电安装船是一艘具备8MW及以下海上风机基础的打桩施工、塔筒吊装和风机安装能力,航区满足国际调遣的动力定位特种工程船舶。本文回顾了风电安装船的发展历程,说明了自航自升式风电安装船的基本概况,论证了作业水深、起重能力、可变载荷和定位方式等船型参数。重点研究了阻力试验结果,自航平台船员舱室问题,桩靴轻量化设计,谐波治理和连续式升降系统选型等设计要点,为同类船型开发提供参考。     

船用梳齿密封流场与泄漏特性数值分析

通过数值仿真对船用梳齿密封的流场情况进行计算,分析比较了梳齿平台密封、梳齿交错密封和斜齿交错密封的压力分布、速度分布情况,揭示了密封腔室内的流动特征,得出了各自的泄露特性,为选择合适有效的汽封结构提供了依据.