摘要：低速纸机敞开式流浆箱模型,以方锥总管及阶梯扩散器作为布浆整流元件,采用稳流室和后墙溢流。分别测定了三种进浆角度,二种堰地长度,二种前墙形式的组合模型在三个不同浆位下,堰池内浆流竖向速度分布和堰口喷射浆流的横向速度分布等。试验结果表明,试验模型采用的阶梯扩散器和稳流室具有较好的布浆、整流效果,后墙溢流可以除去一部分泡沫。一些优化方案具有良好的流态和分布均匀的堰口喷浆速度。根据优化方案设计制造的流浆箱样机的生产试验表明,以方锥总管、阶梯扩散器和短堰池代替单管进浆,翻浆隔板的老式敞开流浆箱所进行的改造是可行的,成纸的纵横向定量波动分别控制在0.5％和2％,流浆箱不堵塞,操作、清洗方便,达到了设计要求。

摘要：在分析了敞开式流浆箱、气垫式流浆箱和引进的用于大型高速造纸机的集流式飘片流浆箱的结构和性能的基础上,结合我国国情的需要,提出适用于中、低速造纸机的新型结构的集流式飘片流浆箱,进行试验模型的结构研究和设计以及模型的试验研究工作,并对其机理进行分析。结果表明:这种新型的集流式飘片流浆箱结构合理,有较佳的性能,适用于中、低车速的造纸机,对飘片流浆箱的机理也提出了一些新的看法,为我国新型集流式飘片流浆箱的研究提供理论依据和实用数据。

摘要：对运载火箭预增压阶段贮箱的增压过程多种状态的增压气体出流形式进行物理建模和仿真。结果表明,不同贮箱增压气体出流形式对气枕空间的温度及压力分布有较大影响,在设计出流形式时,需要对出流的管路或扩散器进行结构优化。

摘要：本文研究运动淡水水体中紊动射流的近区掺混规律.应用紊动射流特征长度比尺法给出了射流中心线轨迹及初始稀释度模型.通过底部潜没扩散器排放与岸边单孔排放水槽试验,建立了扩散器工程参数:出口流速、孔数、扩散器长度、孔径等与污水带轨迹及初始稀释度之间的关系.以实例介绍了成果的工程应用.从稀释扩散能力看,底部潜没排放方式明显优于岸边排放方式.结果表明:长度比尺法物理概念明确、计算简单、应用方便,特别适合于扩散器工程的规划和初步设计.

摘要：Three vaned diffusers, designed to have high negative incidence (-8°) at the design operating point, are studied experimentally. The overall performance (efficiency and pressure ratio) are measured at three rotational speeds, and flow angles before and after the diffuser are measured at the design rotational speed and with three mass flow rates. The results are compared to corresponding results of the original vaneless diffuser design. Attention is paid to the performance at lower mass flows than the design mass flow. The results show that it is possible to improve the performance at mass flows lower than the design mass flow with a vaned diffuser designed with high negative incidence. However, with the vaned diffusers, the compressor still stalls at higher mass flow rates than with the vaneless one. The flow angle distributions after the diffuser are more uniform with the vaned diffusers.

摘要：奥迪e-tron GT开启全球首秀2月10日,奥迪e-tron GT举行了全球首秀庆典,开启奥迪品牌电气化时代的全新篇章。奥迪e-tron GT的外观造型展现出极致动感的艺术之美。从低趴宽体的完美车身比例,到流畅的车顶线与腰线,以及极具视觉冲击力的宽大扩散器与电动扰流板,奥迪e-tron GT的每一个侧面、每一根线条都展现出媲美雕塑的艺术美感。

摘要：High-pressure ratio and wide operating range are highly required for compressors and blowers. The technical issue of the design is achievement of suppression of flow separation at small flow rate without deteriorating the efficiency at design flow rate. A numerical simulation is very effective in design procedure, however, cost of the numerical simulation is generally high during the practical design process, and it is difficult to confirm the optimal design which is combined with many parameters. A multi-objective optimization technique is the idea that has been proposed for solving the problem in practical design process. In this study, a Low Solidity circular cascade Diffuser(LSD) in a centrifugal blower is successfully designed by means of multi-objective optimization technique. An optimization code with a meta-model assisted evolutionary algorithm is used with a commercial CFD code ANSYS-CFX. The optimization is aiming at improving the static pressure coefficient at design point and at low flow rate condition while constraining the slope of the lift coefficient curve. Moreover, a small tip clearance of the LSD blade was applied in order to activate and to stabilize the secondary flow effect at small flow rate condition. The optimized LSD blade has an extended operating range of 114 % towards smaller flow rate as compared to the baseline design without deteriorating the diffuser pressure recovery at design point. The diffuser pressure rise and operating flow range of the optimized LSD blade are experimentally verified by overall performance test. The detailed flow in the diffuser is also confirmed by means of a Particle Image Velocimeter. Secondary flow is clearly captured by PIV and it spreads to the whole area of LSD blade pitch. It is found that the optimized LSD blade shows good improvement of the blade loading in the whole operating range, while at small flow rate the flow separation on the LSD blade has been successfully suppressed by the secondary flow ef

摘要：由于2011年规则变化了。在去年的一个冬天中，车队们一直在寻找各种方法，他们一直在研究如何能够规避实施新规则而带来的损失，同时还在寻思着该怎样最大化利用新轮胎。我当然也怀疑大家号称的革亲斤和创意究竟是神马，现在看起来工程师都和律师们手牵手一起合作了，律师们绞尽脑汁研究规则。双层扩散器和鸭子的旧船票已经登不上今年的客船了，可是今年新船票又长神马样子呢？

摘要：尽管大体设计与普通版Vantage相似,但VantageAMR提供了Sabiro Blue、Pnyx Black、China Grey、White Stone 等五种外观设计,其中有59辆采用了特殊的灰色涂装,车身的拉花、前唇、扩散器、刹车卡钳等零件使用了荧光绿进行处理,这些特别版车型将被称作“Vantage 59”,用以纪念1959年阿斯顿·马丁在24小时勒芒耐力赛获胜60周年。

摘要：GAF型矿用通风机,目前厂家不能提供样本,对设计选型带来一定困难。本文从上鼓厂已发出的报价资料中,按风机尺寸大小,荐选了11种规格,并列出了计算方法,可作为方案选型时参考。