【标题】Non-occlusive pumping principle for blood pump application
【参考中译】血泵应用的无闭塞泵送原理
【类型】 期刊
【关键词】 blood pump; hemolysis; peristaltic pump; red blood cell damage; tube occlusion; Blutpumpe; Hamolyse; Schlauchpumpe; Zerstorung der roten Blutkorperchen; Schlauchquetschung; DAMAGE
【参考中译】 血泵；溶血；蠕动泵；红细胞损伤；输卵管闭塞；蓝矮病；汉莫斯；沙劳克普普；Zerstorung der roten Blutkorperchen；Schlauchquetschung；损害
【作者】 Pech, Sebastian; Richter, Rene; Lienig, Jens
【摘要】 Roller pumps are used in medicine to pump blood in extracorporeal blood circuits. Blood is subjected to mechanical stress in these peristaltic pumps, due to the complete tube occlusion. This stress causes damage to red blood cells (hemolysis). We present a novel peristaltic pumping principle that addresses these issues. In contrast to conventional roller pumps, the tube is stimulated by a circulating eccentric oscillation. Therefore, this type of pump does not require complete tube occlusion. The blood is less mechanically stressed and hemolysis is reduced by 55% compared to a roller pump.
【参考中译】 滚柱泵在医学上被用来在体外血液循环中泵血。由于完全闭塞的管子，血液在这些蠕动泵中受到机械应力。这种压力会对红细胞造成损害(溶血)。我们提出了一种新的蠕动泵浦原理来解决这些问题。与传统滚柱泵不同的是，管子受到循环偏心振荡的激励。因此，这种类型的泵不需要完全封堵管道。与滚柱泵相比，血液的机械压力较小，溶血减少了55%。
【来源】 Automatisierungstechnik: Methoden und Anwendungen der Steuerungs-, Regelungs- und Informationstechnik 2022, vol.70, no.11
【入库时间】 2023/5/30
【标题】Comparative experimental study of heat sinks with piezoelectric pump
【参考中译】压电泵散热器的对比实验研究
【关键词】 Cooling; Heat transfer; Micro-channel structure; Pressure drop; Umbrella valve; Y-shaped bifurcation
【参考中译】 冷却；换热；微通道结构；压降；伞阀；Y形分叉
【作者】 Jun Huang; Linjiao Li; Xingang Cong; Guiping Zhu; Hiba Affane; Quan Zhang; Yuan Wang
【摘要】 How to effectively cool highly integrated electronic devices is a hot and challenging research problem. To improve the cooling performance of microchannel systems, a new piezoelectric pump-based cooling system is proposed in the paper, which includes a piezoelectric pump with umbrella-shaped valves and microchannel-based heat sinks. We theoretically analyzed the effects of flow rates and heat transfer coefficients on the cooling performance when using four different types of microchannel-based heat sinks. Then, the piezoelectric pump and those heat sinks were fabricated, and the maximum output flow rate was experimentally measured. A CPU with a fixed power input was chosen to experimentally access the overall heat transfer coefficient of the heat sinks. The theoretical and experimental results revealed that the cooling performance of the proposed system was related to both the output flow rate and the overall heat transfer coefficient of the heat sinks. At last, we demonstrated that the piezoelectric cooling system, equipped with the heat sink of the tandem Y-shape bifurcation microchannel, had the best cooling performance: the CPU temperature was stabilized within 60.6℃ when the working power of the CPU was fixed at 30 W, resulting in a cooling efficiency up to 51.12%.
【参考中译】 如何有效地冷却高度集成的电子设备是一个热点和具有挑战性的研究问题。为了提高微通道系统的冷却性能，本文提出了一种新型的基于压电泵的微通道冷却系统，该系统包括伞形阀压电泵和基于微通道的散热器。从理论上分析了采用四种不同类型的微通道散热器时，流量和换热系数对散热性能的影响。然后，制作了压电泵及其散热器，并对其最大输出流量进行了实验测量。实验中选择了具有固定功率输入的CPU来获取散热器的总换热系数。理论和实验结果表明，该系统的冷却性能与散热器的输出流量和总的换热系数有关。结果表明，采用串联Y型分叉微通道散热片的压电式制冷系统具有最佳的制冷性能：当中央处理器的工作功率固定在30W时，中央处理器的温度稳定在60.6℃以内，制冷效率高达51.12%。
【来源】 Applied Thermal Engineering 2023, vol.219, no.Pt.B
【标题】MARGIN OF SAFETY: BUCHER ADDS LOAD-CONTROL VALVES
【参考中译】安全裕度：Bucher增加了负载控制阀
【作者】 Michael Pyper
【摘要】 Bucher Hydraulics recently expanded its portfolio of safety valves with a new load-control valve for winches, as well as additional sizes of other load-control valves and pipe-rupture safety devices. When enormous wind turbine rotor blades or entire building roofs have to be positioned with millimeter accuracy, valves from Bucher Hydraulics are usually used, especially for heavy loads. Bucher is expanding an already wide range of safety load-control valves. The CINDY follower principle, which has been tried and tested for decades, continues to play an important role.
【参考中译】 Bucher Hydraulics最近扩大了其安全阀产品组合，推出了用于绞车的新负载控制阀，以及其他负载控制阀和管道破裂安全装置的更多尺寸。当巨大的风力涡轮机叶片或整个建筑屋顶必须以毫米精度定位时，通常使用Bucher Hydraulics的阀门，特别是在重载情况下。Bucher正在扩大已经广泛的安全负载控制阀的范围。辛迪追随者原则，经过几十年的试验和考验，继续发挥着重要作用。
【来源】 Fluid Power Journal 2023, vol.30, no.2
【标题】Valve Vibration Induced Intake Air Flow Dynamics Analysis Using Near Valve Particle Image Velocimetry
【参考中译】利用近气门粒子图像测速仪分析气门振动引起的进气气流动力学
【关键词】 Flow (Dynamics); Valves; Air flow
【参考中译】 流动(动力学)；阀门；气流
【作者】 Shi, Fenghao; Liu, Mengqi; Hung, David L. S.; Li, Xuesong; Xu, Min
【摘要】 The transient dynamics of air flow running through the moving intake valve gaps in combustion cylinders is crucial to the performance of spark-ignition direct-injection engines. However, research on the air flow behavior in the vicinity of valve exits is still limited. In this work, transient air flow characteristics of a custom-designed dual-valve system under the operating conditions of a fixed valve lift and a vibrating valve lift at two frequencies are experimentally investigated. The velocity vector field measured using planar particle image velocimetry (PIV) is first analyzed in time domain based on temporal mean and root-mean-square (RMS) values. Comparison of temporal mean flow fields reveals the difference in flow pattern while RMS represents the variation of intake air jet velocity along the inlet path of the vibration-affected jet. Instantaneous snapshots provide direct analysis of the valve vibration-induced intake air jet behavior. Furthermore, investigation in frequency domain extends insights into the dominant spectral components of flow structures. Fast Fourier transform (FFT) applied to every vector on the velocity field yields a vibration frequency affected zone (VFAZ), indicating the regions where the effect of valve vibration is significant. By employing dynamic mode decomposition (DMD) method, the spatio-temporal PIV results are decomposed into modes with specific frequencies. Reconstructed flow field using modes with the valve operating frequency visually unveils a cyclic vortex structure near the valve exit. In summary, this study elucidates the mechanism of near-valve intake air flow impingement and interaction behavior induced by the valve vibrating motion.
【参考中译】 缸内气流运动的动态特性对火花点火直喷式发动机的性能有重要影响。然而，对阀门出口附近空气流动行为的研究还很有限。本文对自行设计的双阀系统在固定气门升程和振动气门升程两种频率下的瞬时气流特性进行了实验研究。基于时间均值和均方根(RMS)对平面粒子图像测速仪(PIV)测量的速度矢量场进行了时间域分析。时间平均流场的比较揭示了流型的差异，而均方根则代表了进气射流速度沿受振动影响的射流入口路径的变化。瞬时快照可直接分析气门振动引起的进气喷射行为。此外，在频域的研究扩展了对流动结构的主要频谱分量的洞察。对速度场上的每个矢量进行快速傅立叶变换(FFT)，得到一个振动频率影响区(VFAZ)，指示阀门振动影响显著的区域。通过使用动态模式分解(DMD)方法，将时空PIV结果分解成特定频率的模式。利用气门工作频率的模式重建的流场直观地揭示了气门出口附近的循环涡流结构。综上所述，本研究阐明了气门附近进气气流撞击的机理以及气门振动引起的气门相互作用行为。
【来源】 Journal of engineering for gas turbines and power: Transactions of the ASME 2022, vol.144, no.9
【标题】Analysis of the Unsteady Flow Field at Stall Conditions for a Low-Speed Low-Pressure Ratio Axial Fan With Full-Annulus Simulation
【参考中译】低速低压比轴流通风机失速非定常流场全环空模拟分析
【关键词】 compressor stall; surge; operability; fan; compressor; simulation; INCEPTION
【参考中译】 压缩机失速；喘振；可操作性；风扇；压缩机；模拟；启动
【作者】 Bousquet, Yannick; Binder, Nicolas; Rojda, Ludovic; Thacker, Adrien
【摘要】 The present work analyzes the three-dimensional unsteady flow structure of a low-speed low-pressure ratio axial fan stage operating at stall conditions. Unsteady numerical simulations were conducted with the elsA software, which solves the unsteady Reynolds-averaged Navier-Stokes (URANS) equations on a full-annulus calculation domain for the rotor and the stator. The analyses will focus on a near stall operating point, the stall inception mechanisms, and the final rotating stall pattern. Numerical simulations are confronted with experimental measurements from high-frequency Kulite transducers mounted on the casing near the rotor blades and the stator blades. The results show that boundary layer separation occurs on the stator blade close to the hub region at near stall conditions. The reverse flow interacts with the main flow to form a vortex shedding phenomenon. The frequency is not clocked with the blade passage frequency, requiring unsteady full-annulus methodology even for a stable operating point. It is also shown that the final state of the rotating stall region is composed of a single part-span cell that occupies three-quarters of the circumference and rotates at 60% of the shaft speed. This pattern agrees with the experimental measurements in terms of both the number of cells and the rotational speed. Finally, the paper demonstrates that without inlet distortion, the mechanism of the onset of the rotating stall is incorrectly predicted by the simulation. However, when a total pressure inlet distortion is applied, the computational fluid dynamics produces the same inception mechanism that is observed experimentally.
【参考中译】 本文分析了低速低压比轴流风机级在失速工况下的三维非定常流动结构。采用ELSA软件进行了非定常数值模拟，在全环空计算区域内求解了转子和定子的非定常雷诺平均N-S方程。分析的重点将集中在近失速工作点、失速起始机制和最终的旋转失速模式。数值模拟与安装在转子叶片和定子叶片附近的机壳上的高频Kulite换能器的实验测量结果相吻合。结果表明，在近失速条件下，定子叶片靠近轮毂区域存在边界层分离现象。逆流与主流相互作用，形成旋涡脱落现象。该频率不与叶片通过频率同步，即使在稳定的工作点也需要不稳定的全环距方法。结果还表明，旋转失速区的最终状态是由一个占据四分之三圆周、以60%的轴速旋转的部分跨度单元组成。在细胞数目和转速方面，这一模式与实验测量结果一致。最后，通过仿真验证了在没有进气道变形的情况下，旋转失速发生的机理没有得到正确的预测。然而，当施加总压进口扭曲时，计算流体力学产生了与实验观察到的相同的初始机制。
【来源】 Journal of turbomachinery 2022, vol.144, no.11
【标题】ROTARY FEATURES SELECTION OF SNOW BLOWER PARTS AND ACCESSORIES FOR 2023
【参考中译】旋转式特点2023年吹雪机零部件及附件选择
【作者】 Dave McMahon
【摘要】 Scraper bars, tires, tubes, paddles, shave plates, skids, carburetor kits, fuel lines and heavy-duty Aramid fiber belts are among hundreds of snow blower parts and accessories listed in Rotary's new 2023 master catalog. A special 60-page section includes a wide range of items such as jump starters, shafts, bearings, drive discs, auger and axle bearings, air vanes, ignition sets and cables.
【参考中译】 刮雪板、轮胎、管子、滑板、化油器套件、燃油管和重型芳纶纤维皮带都在扶轮组织的S 2023年新目录中列出的数百种吹雪机零部件和附件中。专门的60页章节包括跳跃起动器、轴、轴承、驱动盘、螺旋和车桥轴承、空气叶片、点火装置和电缆等。
【来源】 Outdoor Power Equipment Business: OPE Business 2022, vol.65, no.7
【标题】Experimental performance comparison of R1234yf and R134a automobile air conditioning systems employing a variable capacity compressor
【参考中译】采用变容压缩机的R1234yf和R134a汽车空调系统的性能比较
【关键词】 R1234yf; R134a; Exergy; Automobile; Air conditioning; Variable-capacity compressor
【参考中译】 R1234yf；R134a；(火用)；汽车；空调；变容量压缩机
【作者】 Erkutay Tasdemirci; Ertan Alptekin; Murat Hosoz
【摘要】 The use of refrigerants from the hydrofluorocarbon family has been restricted due to their high global warming potential, and the manufacturers have been using R1234yf recently, a refrigerant from the hydrofluoroolefin family, as a substitute for R134a in mobile air conditioning (MAC) systems. In this study, a laboratory MAC system with a variable-capacity compressor was set up, and its comparative energetic and exergetic performance was evaluated for the cases of using R1234yf and R134a by changing the test conditions in a wide range. The results revealed that the system with R1234yf provided on average 13.7% less cooling duty and 12.8% less coefficient of performance based on the total power input relative to the system with R134a. Furthermore, the system with R1234yf destructed on average 18.9% more exergy per unit cooling duty. Excluding the condenser, the components of the R1234yf system destructed more exergy per unit cooling duty than those of the R134a one.
【参考中译】 氢氟烃系列制冷剂的使用受到限制，因为它们具有较高的全球变暖潜力，制造商最近一直在使用氢氟烯烃系列制冷剂R1234yf，作为移动空调系统中R134a的替代品。本研究建立了实验室变容量压气机空调系统，并在较大范围内改变试验条件，对R1234yf和R134a两种发动机的比较能量和耗能性能进行了评价。结果表明，与使用R134a的系统相比，使用R1234yf的系统平均减少了13.7%的制冷负荷，基于总功率输入的性能系数降低了12.8%。此外，采用R1234yf的系统每单位制冷负荷平均多消耗18.9%的火用。不包括冷凝器，R1234yf系统的每单位制冷负荷的部件比R134a系统的部件破坏更多的火用。
【来源】 International Journal of Vehicle Design 2022, vol.90, no.1/4
【标题】No longer for nerds: Cooler, faster Prius is a head-turner
【参考中译】不再是书呆子：更酷、更快的普锐斯让人目瞪口呆
【作者】 RICHARD TRUETT
【摘要】 LOS ANGELES - The Toyota Prius is a nerd mobile no more. In the quarter century since the pioneering gasoline-electric fuel sipper was born, it has gone from a frumpy, dumpy subcompact sedan to a weird origami-styled hatchback with bizarre zigzag taillights. The 2004 second-generation car, a nicely proportioned hatchback with a smoothly integrated front end, almost turned the corner onto Hip Street, but for a leisurely 11-second 0-to-60 mph run.
【参考中译】 洛杉矶--丰田普锐斯不再是一款呆板的手机了。在开创性的汽油电动吸油器诞生后的四分之一个世纪里，它已经从一辆破旧、笨重的微型轿车变成了一款奇怪的折纸风格的掀背车，带有奇怪的锯齿形尾灯。这款2004年的第二代汽车是一款比例合理的掀背车，前端集成得很流畅，几乎拐进了协街，但可以从容地跑11秒0到60英里每小时。
【来源】 Automotive News 2022, vol.97
【标题】Using creative synchronous averaging for detecting defects of a belt-driven bevel gearbox
【参考中译】创新同步平均法检测皮带传动圆锥齿轮箱缺陷
【作者】 S Ganeriwala
【摘要】 Condition monitoring of gearboxes in industrial settings is often based on trending vibration levels at the gear mesh frequencies and sideband frequencies associated with the rotational speeds of mating shafts. However, the vibration levels for setting different alarms related to gearbox health are debated. Another issue of controversy is the question of what an indicator of fault severity is: is it the energy in the gear mesh frequencies or the energies in the sidebands? In this work, we analysed the vibration signature caused by gear tooth seeded faults of different levels. The data was analysed in both the time and frequency domains. The experimental study was conducted on a Machinery Fault Simulator (MFS). The pinion gear in the gearbox was intentionally faulted with increasing severities and a vibration signal was collected for each case using IEPE accelerometers. Data was also obtained using a high-resolution encoder. Signals were analysed using time synchronous averaging and traditional spectrum analysis. The results indicate that the vibration signature of a faulted bevel gear tooth is a pulse in the time domain. Because of this impulse signal, strong sidebands arise in the spectrum around the mesh frequency and the energy in the sidebands is a better indicator of the severity of the tooth defect.
【参考中译】 工业环境中齿轮箱的状态监测通常基于齿轮啮合频率和与配合轴转速相关的边带频率的趋势振动级。然而，设置与变速箱健康相关的不同警报的振动级别存在争议。另一个有争议的问题是，故障严重程度的指标是什么：是齿轮啮合频率中的能量还是边带中的能量？本文分析了不同程度的轮齿萌生故障引起的振动特征。对数据进行了时间域和频域分析。实验研究是在机械故障模拟器上进行的。变速箱中的小齿轮故意出现故障，严重程度越来越高，并使用IEPE加速度计收集了每个案例的振动信号。数据也是使用高分辨率编码器获得的。信号分析采用时间同步平均和传统谱分析方法。结果表明，故障伞齿轮轮齿的振动特征在时间域内为脉冲。由于这种脉冲信号，在啮合频率附近的频谱中会出现较强的边带，而边带中的能量是反映牙齿缺陷严重程度的更好指标。
【来源】 Condition Monitor 2023