拖式吊舱螺旋桨定常性能理论计算

本文提出拖式吊舱螺旋桨(螺旋桨位于吊舱首部)定常水动力性能的势流理论计算方法。螺旋桨采用升力面理论涡格法、吊舱采用面元法分析计算，二者的相互干扰通过叠代计算来处理。考虑吊舱的影响，修改了尾涡模型。应用本方法，计算了拖式吊舱螺旋桨的定常性能，并与空泡水筒试验结果进行了比较，计算与试验吻合良好。     

导流筒浆态连续结晶器内鸟粪石的反应结晶动力学——器内流体力学的影响

A laboratory-scale reaction-crystallization process of struvite synthesis from diluted water solution of Mg2+, and ions was studied. The research covered the tests of two original constructions of continuous jet-pump Draft Tube Magma (DTM)-type crystallizers with internal circulation of suspension (upward/downward). Interactions between constructional, hydrodynamic and kinetic factors were established and discussed. Nucleation and linear growth rates of struvite crystals were calculated on the basis of population density distribution. Kinetic model of idealized Mixed Suspension Mixed Product Removal (MSMPR) crystallizer considering the size-dependent growth mechanism was applied (Rojkowski hyperbolic equation). For comparison purposes the kinetic data corre-sponded to a simpler, continuous draft tube-type crystallizer equipped with propeller agitator were analyzed. It was concluded that crystal product of larger size was withdrawn from the jet-pump DTM crystallizer of the descending flow of suspension in a mixing chamber.     

大型34CrMo1合金钢螺旋桨轴锻件的研制

大型34CrMo1合金钢螺旋桨轴锻件对超声检测、力学性能、非金属夹杂物、晶粒度等技术要求非常严格。通过强化各生产环节的过程质量控制,严密组织生产,最终成功研制了轴锻件。     

A maximum power point tracking control method suitable for compact wind power generators with the passive self‐pitch‐controlled blade structure

This paper describes a maximum power point tracking (MPPT) control method for propeller‐type compact wind power generators with passive self‐pitch‐controlled blades, which quickly makes the output current and voltage converge on the maximum power point based on wind speeds detected from an anemometer. The voltage and current output from these wind power generators vary with wind speeds at locations such as the roofs of buildings. Transient characteristics of the voltage output from compact wind power generators have two modes because of the self‐pitch‐controlled blades: mode I in which the output voltage hardly increases and mode II in which it rapidly increases. Thus, in order to acquire the generated power effectively, irrespective of how the wind speeds may change, a method to perform the MPPT control while searching for mode II is needed. Thus, by judging the mode from the change of the sign of the time differential of the voltage deviation between sampling times, the MPPT control method proposed here makes the output current converge on the maximum point using relationships between the maximum power and optimal current which give the maximum power and the wind speed. Effectiveness of the proposed MPPT control method is verified through simulations and experiments using a wind tunnel. IEEJ Trans 2010 DOI: 10.1002/tee.20609     

世博庆典舟桥开启机构的设计

介绍了世博庆典舟桥开启过程及三种开启机构设计方案:双轴承液压缸驱动方案、双轴承螺旋桨驱动方案以及单轴承螺旋桨驱动方案;分别分析计算液压缸的功率、脉动情况及螺旋桨功率.     

螺旋桨和弹载无人机相互干扰分析

为了研究螺旋桨与弹载无人机的相互干扰,使用滑移动网格技术对螺旋桨进行数值仿真,借助颗粒轨迹、分段受力计算和相关力矩计算对仿真结果进行分析。分析结果表明螺旋桨的干扰会对无人机稳定性产生影响,借助副翼偏转和垂尾的恢复力矩可以使无人机保持相对稳定;螺旋桨的滑流掠过机翼使升力增加,并产生与螺旋桨扭矩相反的力矩。     

FL-12风洞螺旋桨带动力试验系统

为提升FL-12风洞螺旋桨带动力试验能力,研制一套螺旋桨带动力试验系统.该系统主要用于模拟螺旋桨滑流特性及非对称动力状态下飞机的气动特性.介绍试验装置系统组成和设计,并分析地面调试结果.结果表明:该系统在转速控制精度和系统自动化程度等方面有很大提高,部分技术指标达到国际先进水平.     

RXT软管旋转推进器设计及应用

介绍了一种长距离、大口径管路清洗专用设备———ＲＸＴ软管旋转推进器详细论述了它的工作原理、结构设计、清洗效果及工作特点,它与高压清洗机配合,具有压力高、操作简便、移动自如、省工省电、清洗距离长、能够通过弯头,可对大口径管道系统进行不拆卸清洗,值得大力推广使用     

5 000 t公务船调距桨桨叶数选型研究

针对国内外调距桨桨叶数选型依靠经验为主,对不同桨叶数对推进器整体性能的影响始终缺乏定量分析的现状,以某5 000 t公务船为目标船型,通过调距桨分别配置不同的桨叶数,分析不同桨叶数对目标船型综合性能的影响。总结了公务船调距桨桨叶数选型的方法,归纳了不同叶数调距桨的优劣,可为后续新造船桨叶数的选取提供参考。     

叶片开度对贯流式水轮机飞逸过程的影响

为有效降低水轮机飞逸过程中机组的振动问题,通过水轮机试验模型改变导叶开度和桨叶开度对水轮机过渡过程进行研究,分析了多个监测点的压力、频率流量等工作参数的变化情况.结果 表明,由于转速和流量的增加,水轮机在导叶开度60°和桨叶开度4°运行时振动最为强烈,水轮机在低频时振动剧烈.由于受到导叶和桨叶动静影响,转轮出口振动强烈...