摘要：A new hydraulic design method of three-dimensional guide vane for centrifugal pump is proposed on the assumption that the fluid at the outlet of guide vane satisfies the uniform velocity moment *** geometry of blade is controlled by the distributed rule of blade angles along the meridional streamline which is described by a fourth-order *** results demonstrate that the designed guide vane can overcome the drawback of two-dimensional guide vane,enlarge the high efficiency scope and improve the hydraulic performance of centrifugal pump on the off-design operation *** comparison with the performance of the centrifugal pump without inlet guide vane,the peak value of efficiency can be enhanced by 2.13% after the three-dimensional guide vane was being *** three-dimensional entire flow field of the centrifugal pump with inlet guide vane is simulated,and the basic principle and mechanism of inlet guide vane pre-whirl regulation are *** validity of design method has been proved.

摘要：The continuous pursuit for a better quality of life promotes continuous advancements in intelligent *** wearable and implantable bioelectronics have emerged as an innovative complement to rigid material-based electronic devices[1-3].Due to their distinct advantages in terms of ductile,ultrathin,and biocompatible features,these elastic and soft bioelectronic devices can be seamlessly mounted onto various real or artificial tissues and organs.

摘要：机机翼前缘结冰会改变机翼的气动轮廓并影响整体的空气动力学性能.研究简化角冰冰形对翼型绕流流场结构的影响可以为飞机防冰设计提供有价值的参考.采用粒子图像测速技术,在低速直流风洞中对覆盖不同角冰冰形的翼型在不同攻角时的流场结构进行了详细的实验测量.实验对象包括三种简化的冰形和原始冰形.结果表明,在本研究范围内,覆盖简化冰形的翼型和覆盖原始冰形的翼型在流场参数上的最大差异为35.11%.与原始冰形相比,覆盖简化的角冰冰形的翼型流场中的分离泡距离翼型前缘和后缘更远.在三种冰形简化方法中,将冰角简化成矩形并在冰角之间添加抛物线的连接方式具有比较好的简化效果.在选定的两个区域中,这种简化冰形和原始冰形在翼型绕流流场的参数平均值的差异在14.88%之内.

摘要：The influence of complicated interaction between the flow field and heat transfer in cooled turbines becomes more and more significant with the increasing turbine inlet temperature. However, classical through-flow methods did not take into account the influence of the interaction caused by air cooling. The aerodynamic design and cooling design of cooled turbines were carried out separately, and the iterations between the aerodynamic design and cooling design led to a long design period and raised the design cost. To shorten the design period and decrease the design cost, this paper proposes a concise aero-thermal coupled through-flow method for the design of cooled turbines, taking into account the influence of the complicated interaction between the flow field and heat transfer in cooled turbines. The governing equations, such as energy equation and continuity equation in classical through-flow method are re-derived theoretically by considering the historical influence of cooling with the same method that deals with viscous losses in this paper. A cooling model is developed in this method. The cooled blade is split into a number of heat transfer elements, and the heat transfer is studied element by element along both the span and the chord in detail. This paper applies the method in the design of a two-stage axial turbine, of which the first stator is cooled with convective cooling. With the prescribed blade temperature limitation and the knowledge of the flow variables of the mainstream at the turbine inlet, such as the total pressure, total temperature and mass flow rate, the convergence of the calculation is then obtained and the properties of the flow field, velocity triangles and coolant requirement are well predicted. The calculated results prove that the aero-thermal coupled through-flow method is a reliable tool for flow analysis and coolant requirement prediction in the design of cooled turbines.

摘要：Microfluidic channels are at micrometer scales;thus,their fluid flows are laminar,resulting in the linear dependence of pressure drop on flow rate in the length of the *** ratio of the pressure drop to flow rate,referred to as resistance,depends on channel size and dynamic ***,a microfluidic chip is analogous to an electric circuit in design,but the design is adjusted to optimize channel ***,whereas voltage loss is negligible at the nodes of an electric circuit,hydraulic pressure drops at the nodes of microfluidic chips by a magnitude are comparable to the pressure drops in the straight ***,we prove by experiment that one must fully consider the pressure drops at nodes so as to accurately design a precise microfluidic *** the process,we numerically calculated the pressure drops at hydraulic nodes and list their resistances in the range of flows as *** resorted to machine learning to fit the calculated results for complex ***,we obtained a library of node resistances for common junctions and used them to design three established chips that work for single-cell analysis and for precision allocation of solutes(in gradient and averaging concentration microfluidic networks).Endothelial cells were stimulated by generating concentrations of adriamycin hydrochloride from the last two microfluidic networks,and we analyzed the response of endothelial *** results indicate that consideration of junction resistances in design calculation brings experimental results closer to the design values than *** approach may therefore contribute to providing a platform for the precise design of organ chips.

摘要：在 CDQ (科克干燥熄灭) 柄，有复杂结构的发泄帽子在冷却室下面在锥形的漏斗被安装。它行动介绍冷却气体并且在房间支持下降焦炭。设计和发泄帽子目的安装，到得到相对一致的煤气的分发在插头减少焦炭的温度变化并且认识到 CDQ 的稳定的操作仪器。在这篇论文，在 1:7 规模 CDQ 试验性的柄的发泄帽子的气体的狂暴的流动被使用 CFD (计算液体动力学) 数字地模仿软件， CFX。速度地，插头流动分发和在三种发泄帽子(叫的高发泄帽子，低发泄帽子和椭圆形的发泄帽子) 下面的每个插头的压力落下因素被分析并且比较。结果生产椭圆形的发泄帽子的压力落下因素比另外的二发泄帽子大，并且高发泄帽子和低发泄帽子的压力落下因素几乎有一样的价值。当时为一顶指定发泄帽子，没有压，有压砖的压力落下因素比那大砖。在这篇论文的工作为为大规模 CDQ 柄设计发泄帽子是珍贵的。

摘要：Cooling water is an important part in a Spallation Neutron Source target cooling system, but the unstable vortexes at the exits of the slits between every two tungsten target slices have a negative impact on the stable running of the target system. We apply the field synergy principle for fluid flow to obtain the optimal flow field, which has a uniform velocity distribution without eddy, and then, optimize the geometrical structure of the cooling water flow channel based on the optimal flow field. The results show that when the cooling water flows in the optimized channel, the eddy sizes decrease, the time fluctuations of velocity and pressure almost vanish, and the volume flow rates of the cooling water in each parallel slit are uniform. Therefore, it effectively improves the running stability of the target system with the premise of satisfying the target heat load.

摘要：This paper proposes a comprehensive thermodynamic and economic model to predict and compare the performance of concentrated solar power plants with traditional and novel receivers with different configurations involving operating temperatures and *** simulation results reveal that power plants with novel receivers exhibit a superior thermodynamic and economic performance compared with traditional *** annual electricity productions of power plants with novel receivers in Phoenix,Sevilla,and Tuotuohe are 8.5%,10.5%,and 14.4%higher than those with traditional receivers at the outlet temperature of 550℃.The levelized cost of electricity of power plants with double-selectivecoated receivers can be decreased by 6.9%,8.5%,and 11.6%.In Phoenix,the optimal operating temperature of the power plants is improved from 500℃to 560℃by employing a novel ***,the sensitivity analysis of the receiver heat loss,solar absorption,and freeze protection temperature is also conducted to analyze the general rule of influence of the receiver performance on power plants *** absorption has a positive contribution to annual electricity productions,whereas heat loss and freeze protection temperature have a negative effect on electricity *** results indicate that the novel receiver coupled with low melting temperature molten salt is the best configuration for improving the overall performance of the power plants.

摘要：The characteristics of oxy-coal combustion for a swirl burner with a specially designed preheating chamber are studied *** order to increase the accuracy in the prediction of flame temperature and ignition position,eddy dissipation concept(EDC)model with a skeletal chemical reaction mechanism was adopted to describe the combustion of volatile *** was conducted under six oxidant stream conditions with different O2/N2/CO2molar ratios:21/79/0,30/70/0,50/50/0,21/0/79,30/0/70 and 50/0/*** showed that O2enrichment in the primary oxidant stream is in favor of combustion stabilization,acceleration of ignition and increase of maximum flame temperature,while the full substitution of N2by CO2in the oxidant stream delays ignition and decreases the maximum flame ***,the overall flow field and flame shapes in these cases are very similar at the same flow rate of the primary oxidant *** characteristics of the air-coal is similar to that of the oxy-coal with 30%O2and 70%CO2in the oxidant stream,indicating that the rear condition is suitable for retrofitting an air-coal fired boiler to an oxy-coal *** swirl burner with a specially designed preheating chamber can increase flame temperature,accelerate ignition and enhance burning intensity of pulverized coal under oxy-coal ***,qualitative experimental validation indicated the burner can reduce the overall NOx emission under certain O2enrichment and oxy-coal combustion conditions against the air-coal combustion.

摘要：In this paper an optimization method of the runner blades in a bulb turbine based on CFD analysis is *** the method the main scales of the turbine including guide vane,runner and draft are *** the runner blades are modified based on the present *** the optimization method the runner blade is expressed by spline surface with a gather of coordinate *** B-spline curve is used to keep the modified blades *** order to make the blade optimization simple and ef- ficient,one of the coordinates is fixed and only the angles of the points are changed according to different modification *** main optimization principles based on flow diagnosis are presented *** three principles are all based on the CFD analysis of the internal flow in bulb *** the purpose of method verification,the optimization method is used in a model bulb turbine.A three dimensional steady turbulent computation is carried out through the whole passage including the bulb body,guide vanes,runner and draft tube of the bulb turbine under seven different work *** SST k-ωturbulence model is used during the CFD analysis and the performance of the turbine can be *** runner blade is optimized according to the three optimization principles based on flow *** CFD analysis is conducted again on the optimized turbine and another modification is needed if the new turbine can’t satisfy the required *** of the computational results between the original turbine and an optimized one indicates that the optimization method is practical and does improve the performance of the bulb turbine.