叶轮

D models are the most widely spread in the world of turbo-machinery for its simplicity, but they are indeed purely empirical correlations which not only fail to provide detailed information inside one or more components, but also require significant effort to recreate themselves if engine operating conditions or component representations change; quasi 3-D models have been the workhorses for compressor and turbine design for many years, and the primary benefit of using quasi 3-D system models is to facilitate the design and detail analysis of a particular component across the range of possible boundary conditions; Full 3-D models are gradually replacing quasi 3-D ones by virtue of requiring no exit flow angle model and loss model and being capable of predicting secondary flow in cascade.

零维模型由于使用时简单易行，因此在涡轮发动机的仿真中得到广泛应用，但零维模型作为纯粹的经验关系式无法反映部件内部的流动细节，并且一旦部件有少许改动则新特性的建立耗费巨大；准三维模型由于能够详细地提供部件内部的流动情况，方便设计而成为涡轮和压气机设计的主要工具；全三维数学模型正逐步取代准三维模型在涡轮设计中的主导作用，同后者相比前者能够预测叶轮机械内的二次流动，在粘性流计算时不需要气流角和损失的经验公式，因此拥有巨大的发展前景。

The head and efficiency of the ten models were predicted and compared with the experiment results. The theoretical head and hydraulic loss in impellers and volutes were calculated by the two methods.

预测了各模型的总效率和扬程并与试验值做了比较；计算了理论扬程以及叶轮和蜗壳内的水力损失。

Slurry pumps are widely used for mining. Suffering from running liquid, their covering plates, volutes and vanes are easily corroded and worn, and the mechanical efficiency decreases to failure in a short time.

渣浆泵是矿山选矿车间重要的机械设备，由于矿浆的冲刷、摩擦和腐蚀的作用，渣桨泵的前后护板、蜗壳和叶轮等过流部件表面受磨损和腐蚀非常严重，短时间内就造成机械效率下降直至完全失效，严重影响着矿山的正常生产。

D turbulent flow in impeller of centrifugal pump with splitting vanes was simulated for the first time.

对偏置的分流叶片离心泵叶轮内三维不可压湍流场进行数值模拟。

If the flow, it is due to impeller end of the sealing ring or rejection oil ring damage caused by the disintegration of turbocharger should be repaired.

如畅通，则是由于叶轮一端密封环或甩油环损坏所造成，应解体增压器进行修复。

SS company specializing in the production of magnesium alloy casting furnace quantitative including : melting holding furnace , labor and the magnesium impeller pump , the protection of gas mixing devices , three-dimensional wide snorkels , Siemens PLC control system .

公司专业生产SS镁合金定量浇铸炉；含：熔化保温炉，劳和叶轮镁液泵，保护气体混合装置，三维全液压升降台，西门子PLC控制系统等。

The flow conditions in the outlet section of the suction box and in the entrance section of discharge passage are substantially different from those assumed in numerical computation, resulting in notable influence on hydraulic losses and pumping system performance.

研究发现，水泵叶轮旋转和导叶出口剩余环量与进、出水流道的内部流场相互作用，进水流道的出口水流条件和出水流道的进口水流条件与单独计算时的假定有本质不同，对进、出水流道的水力损失和装置性能有显著的影响。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

They have long, narrow parallel-veined leaves, whorled or alternate, arising at the base of the stem or along it.

百合科植物具有狭长的叶，平行叶脉，叶轮生或互生，在茎基部或沿着茎生长。

Performance was compared with single rotor and fan with support board, and flow analyzed in support passage. The support board was found to have significant impact on the performance of axial-flow fan, and there were complex flow separate and second flow in the support board passage.

对单叶轮风机性能同有支板的风机性能进行比较，以及对风机动叶及支板通道中的流动情况进行了分析，结果表明支板对风机的性能有着较大的影响，支板通道内存在复杂的气流分离漩涡和二次流动等。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。