波浪中螺旋桨推力变化的近似计算

螺旋桨在波浪中随船运动是前进、旋转和振荡三者的结合。本文近似计算波浪中桨流体动力性能相对于静水中性能的变化,将波浪中螺旋桨运动分解为旋转兴波和振荡兴波两部分线性迭加。利用Ｇｒｅｅｎ函数法,求解其兴波问题,给出桨推力的变化值。编制程序进行了系列数值计算。结果表明,波浪中螺旋桨推力系数变化值随桨轴浸深、桨升沉振荡频率和幅值而变化。     

低负荷工况下调距桨的使用

调距桨装置可使螺旋桨在任何工况下都能吸收主机功率,但调距桨装置的使用并不是不受限制的,尤其是低负荷工况下的使用。不合理的使用调距桨装置(螺距和转速的匹配)可能会引起螺旋桨效率和空泡性能下降。本文以低负荷工况为常用工况的某型船为例介绍了调距桨装置的设计,对低负荷工况运行调距桨的设计具有参考和借鉴意义。     

传动轴和轮胎不平衡量导致整车异常振动问题的解决方法

针对两台样车产生异常振动的问题进行了分析研究,发现传动轴或轮胎总成在装配定位时不平衡量超出技术要求分别是导致两样车异常振动的主要影响因素。提出了控制产品质量的具体措施,使样车的异常振动现象得到了有效的控制。总结了解决此两类异常振动问题的步骤,规范了类似异常振动问题的处理方法。     

船用螺旋桨负载动态实验仿真装置研究

介绍了动态仿真船用螺旋桨负载的总体方案并给出了一种仿真装置。该装置能仿真螺旋桨在各种工况下的静、动态特性，为推进电机提供逼真的轴负载。装置的主体为转矩随动系统，其反馈转矩的测量采用了转矩传感器，文章以某深潜救生艇的螺旋桨负载为研究对象，建立了系统的数学模型，设计了转矩随动系统，利用设计的装置进行了综合仿真，仿真结果与负载实际响应接近。     

Numerical Calculation of Marine Propeller Hydrodynamic Characteristics in Unsteady Flow by Boundary Element Method

In this paper, a low-order potential based on surface panel method is used for the analysis of marine propellers in unsteady flow.A linear propeller wake model is employed and its geometry is assumed to be independent of the time.The calculation in time domain is carried out from a moment when the rotation of the propeller becomes steady instead of from the moment when the rotation strats from stationary condition.At every time step a linear algebraic equation established on a key blade is solved numerically combined with the Kutta pressure conditon.The calculated results by developed code indicate good convergency and effrctiveness of present algotithm for conventional propellers and highly skewed propellers.     

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.     

翼剖面优化理论在螺旋桨设计和减荷切削中的应用

用Epller的叶剖面设计方法与螺旋浆升力面理论相结合的方法进行了水翼剖面的优化，并将其应用到螺旋桨减振降噪设计中获得了显著的效果，在螺旋桨减荷切削中用优化水翼剖面获得了出奇制胜的成功。     

Design of propeller geometry using streamline-adapted blade sections

We refine the geometry of a propeller by modifying the blade sections to align them with surface streamlines, obtained by the panel method. Redefinition of the blade sections aligned with the streamlines is provided together with surface modeling scheme by which model propellers were built. Numerical simulations and open-water tests on models suggest a possible increase of 1% in propeller efficiency.     

基于伴随方法的螺旋桨参数影响分析

为探究螺旋桨各参数对螺旋桨性能影响关系,从面元法基本方程和面元法边界条件出发,建立螺旋桨参数影响分析的伴随方法.通过分析等压库塔条件,建立了伴随方程,基于伴随方程探究了螺旋桨性能与参数之间的敏感导数求解公式.选择DTMB4381桨作为研究对象,开展螺旋桨推力系数与螺距分布和拱弧分布之间的敏感导数求解,得到不同参数对螺旋桨性能的影响规律.数值结果表明,伴随方法计算得到的敏感导数与传统方法计算结果具有很好的一致性,但伴随方法的计算时间更短,且随着变量个数的增多,伴随方法计算效率的优势越大.     

护卫舰5叶侧斜螺旋桨的研究设计

本文叙述了我国护卫舰第一次应用５叶侧斜桨所经历的设计、模型试验、制造、实船测试、修改设计、再试验到最终交付使用的全过程，给出了诸如航速、功率、空泡、脉动压力、振动等的船模试验和实船测试结果，还介绍了解决实船桨叶随边局部变形的措施。