147 000 m3薄膜型LNG(液化天然气)船船型开发

该文对国内第一个LNG船项目的船型开发、船模试验等方面进行了简单的介绍,并就螺旋桨的设计与桨叶数量的选择等问题进行了分析比较。     

Study on the design of propeller blade sections using the optimization algorithm

A new method for designing propeller blade sections is presented. A vortex lattice method is used to evaluate the performance and the time-dependent pressure distribution on the blade surface in a non-uniform flow, while efficient optimization algorithms are used to modify the blade sections. Two different designs were carried out in this study. The first was a design to realize a target pressure distribution in a rotating three-dimensional flow. A two-dimensional wing theory was used to obtain the target pressure distribution. The predicted increase in efficiency and the reduction in the cavity volume were confirmed by model experiments. The second was a design to maximize the propeller efficiency. By this method, the propeller efficiency was improved by 1.2% under the constrains of constant thrust and a prescribed margin for face cavitation.     

船用调距桨液压系统修理工艺改进性研究

文章针对某船用调距桨液压系统存在的配油器轴密封部位易磨损、变距操作性能不稳定等问题进行改进性研究，分析配油器、液控锁止阀的结构及工作原理，找出了存在问题的原因，提出有针对性的改进方案，并详细介绍改进的工艺步骤，试航结果证明该改进方案的有效性：     

降低船体振动的桨舵偏置设计方案

采用比水面船舶常规桨舵配置多一只舵或少一二只舵，通过合理布置桨舵相对位置，以降低船舶的振动和噪声、提高船舶推进效率、提高船舵控制航向的性能。此方法特别对水面船舶设计有实用价值。     

Design of Fin-propeller Test Set-up and Analysis of Roll Stabilization Ability

Presents the fin-propeller test set-up to solve the problem of roll stabilization with ships in full speed range, withwhich, tests were run in water rank for acquisition of data, and concludes from data acquired that the fin-propeller test set-up produces more lift than simple fin, and provides lateral thrust as well, and it is therefore an effective roll stabilization devicefor ships in full speed range.     

非均匀流场中抗空泡桨叶剖面设计

给出非均匀流场中螺旋桨桨叶剖面的设计方法,提出保持剖面空泡特征不变的等效运转曲线的思想与确定方法。本文方法设计的桨叶剖面能有效地控制空泡范围和空泡类型,得到期望的空泡性能。剖面可采用母型剖面或“新剖面”方法来设计,进而可确定桨叶弦向环量分布,然后由升力面理论设计三维桨叶的几何形状。通过实例螺旋桨的设计,其空泡性能得到显著的改善,说明本方法是合理和有效的。     

螺旋桨-冰接触工况下载荷试验研究

船舶在冰区航行时,经常会发生碎冰在艏部下沉,并沿着船体滑入螺旋桨前的流场中,导致高速旋转的螺旋桨与冰发生切削作用,使得螺旋桨桨叶发生严重变形和损坏。为了进一步分析和研究螺旋桨-冰切削过程中的各种载荷,文中首先在拖曳水池中搭建了螺旋桨-冰切削试验平台,详细叙述了测量设备和模型冰推送装置。然后,通过重复性分析以及与其他学者的研究进行对比分析,验证了试验平台的可行性和可靠性。最后,对螺旋桨-冰在空气中以及在水中切削时受到的载荷情况进行了详细的分析。试验结果表明:螺旋桨-冰切削试验平台的搭建具有可行性,能够较好地测量螺旋桨-冰的切削载荷;模型冰移动的速度越快,螺旋桨受到的挤压载荷越大;螺旋桨-冰切削过程中接触载荷的详细描述对冰级螺旋桨的结构设计具有重要的工程意义和应用价值。     

斜流中船后螺旋桨水动力数值分析

基于CFD对国际标模KCS斜航状态进行了数值模拟,分析了不同漂角时螺旋桨在纵向、横向、垂向三个方向上的力和力矩的变化规律,并探讨了漂角对推力偏心矩的影响。数值模拟采用RANS(Reynolds-Averaged Navier Stokes)方法,结合SST k-ω湍流模型和滑移网格。计算考虑了±20o,±10o以及0o漂角,结果表明：由于横向水流改变了螺旋桨桨盘面上的载荷分布,漂角对螺旋桨的横向和垂向的力和力矩有显著影响,漂角方向对螺旋桨推力偏心矩的偏移有较大影响。     

滑行艇半浸式螺旋桨的水动力学特性

Demand for high-speed marine vehicles (HSMVs) is high among both commercial and naval users. It is the duty of the marine vessel’s designer to provide a hull and propulsion system that diminishes drag, improves propulsive efficiency, increases safety and improves maneuverability. From the propulsor side, surface piercing propellers (SPPs) should improve performance. Unlike immersed propellers, behavior of the SPP is affected by depth of immersion, Weber number and shaft inclination angle. This paper uses a practical numerical method to predict the hydrodynamic characteristics of an SPP. The critical advance velocity ratio is derived using the Weber number and pitch ratio in the transition mode, then the potential based boundary element method (BEM) is used on the engaged surfaces. Two models of three and six-bladed SPPs (SPP-1 and SPP-2) were selected and some results are shown.     

螺旋桨片状空泡的CFD分析

基于RANS求解器采用非结构化网格对螺旋桨敞水性能和空泡性能进行了数值模拟,主要研究了不可压缩性气体质量分数对螺旋桨片空泡预报结果的影响,空泡模型采用基于输运方程的完整空化模型,预报的敞水性能与试验值吻合较好,预报的空泡形态与文献结果及公开发表的试验结果相一致。这表明,用该方法预报螺旋桨空化性能是可行的,为以后进一步研究螺旋桨空泡打下了基础。