低比转速,low specific speed
1)low specific speed低比转速
1.Method of estimating eighth section area oflow specific speed pumps;低比转速离心泵蜗壳第八断面面积确定新方法
2.Criteria of blade number selection forlow specific speed impeller;低比转速叶轮叶片数的选择准则
3.Numerical computation of inner flow passing throughlow specific speed compound impeller of centrifugal;低比转速离心泵复合叶轮内部流动的数值计算
英文短句/例句
1.Application of CFD Technique in Low Specific Speed Centrifugal PumpCFD技术在低比转速离心泵中的应用
2.Impact of impeller type on performance of high-speed centrifugal pumps with ultra-low specific-speed叶轮型式对超低比转速高速离心泵性能的影响
3.Orthogonal design of complex impeller of centrifugal pump with super-low-specific-speed超低比转速高速离心泵复合式叶轮的正交设计
4.Cavitation test analysis of low-specific-speed centrifugal-vortex pump for gas-liquid two-phase mixture flow低比转速离心旋涡泵的气液混输汽蚀试验分析
5.Study on performance of low specific speed sewage pump with different vane wrap angles低比转速污水泵叶片包角对水力性能的影响
6.Optimum design of low-specific-speed centrifugal pump for LRE液体火箭发动机超低比转速离心泵优化设计
7.Multi-objective optimization for the geometrical parameters of the low-specific-speed centrifugal impeller低比转速离心泵叶轮几何参数多目标优化
8.Geometric formation method of short blades on compound impeller of high-speed centrifugal pump with super-low specific speed超低比转速高速离心泵复合叶轮短叶片的几何造型方法
9.Hydraulic Optimization Design of Low Specific Speed Turbine Runner of N-J Project in Pakistan巴基斯坦N-J项目低比转速水轮机转轮水力优化设计
10.Experimental and Theoretical Studies on the Flow through the Cascade for a Francis Turbine with Low Specific Speed低比转速混流式水轮机导水叶栅中流动的实验研究
11.Retrofit and Optimization Design of Low Specific Speed Main Oil Pump Based on Performance Prediction;基于性能预测的低比转速主油泵改型及优化设计
12.Numerical Simulation and Analysis of Flow Field of Low Specific Speed Centrifugal Pump;双吸式低比转速离心泵内部流场的数值计算与分析
13.Numerical Simulation and Analysis of Flow Field in Double Suction Impeller and Volute of Low Specific Speed Centrifugal Pump;低比转速离心泵双吸叶轮及蜗壳内部流场的数值计算与分析
14.The Influence of Blade Angles on Low-speed Vortex Pump Performance基于叶片角度对低比转速旋涡泵性能影响的研究
15.Numerical Simulation and Test Study of Flow in Low-Specific-Speed Complex Centrifugal Impeller低比转速复合离心叶轮三维湍流场数值模拟及试验
16.Application of reaction factor in optimizing geometries of low specific speed impellers反击系数在低比转速叶轮几何参数优化中的应用
17.The Maze helix pump is a kind of special pump which is small rate of flow, . high lift and low rotational speed. Its specification is safe and long durability.迷宫螺旋泵是一种小流最、高扬程、低比转速的新型特种泵,其特点是使用安全可靠、寿命长。
18.The direct convertor is fact, but with little accuracy.直接比较式转换器速度高，但精度低。
相关短句/例句
low-specific-speed低比转速
1.Numerical analysis on two-phase flow through impeller oflow-specific-speed centrifugal pump;低比转速离心泵叶轮内固液两相流的数值分析
2.Optimum design oflow-specific-speed high-speed centrifugal pump based on genetic algorithm;基于遗传算法的低比转速高速泵优化设计
3.Cavitation test analysis oflow-specific-speed centrifugal-vortex pump for gas-liquid two-phase mixture flow低比转速离心旋涡泵的气液混输汽蚀试验分析
3)super-low specific speed超低比转速
1.The paper introduces the current status of study on the hydraulic design of thesuper-low specific speed centrifugal pump.介绍了超低比转速离心泵水力设计的研究现状及设计过程中叶轮参数的选取方法。
4)low specific speed pump低比转速泵
5)low specific speed centrifugal pump低比转速离心泵
1.Model of enlarged flow design forlow specific speed centrifugal pump;低比转速离心泵加大流量设计模型
2.Effect of clearance of impeller wear-rings on efficiency oflow specific speed centrifugal pump;叶轮口环间隙对低比转速离心泵效率的影响
3.Based on the characteristics oflow specific speed centrifugal pump as well as its existing problems and research situation,this paper introduced the advantages of analysis technique of computational fluid dynamics(CFD),then it summarizes the CFD technique\"s research methods and research progress.针对低比转速离心泵的特点、存在的问题及研究情况,介绍了CFD技术研究与分析的优点,综述了其在低比转速离心泵中常用的研究方法、研究进展;最后对CFD技术在低比转速离心泵中的研究方向、发展前景做了展望。
6)low specific-speed centrifugal pump低比转速离心泵
1.Coefficient-enlargement method for design oflow specific-speed centrifugal pump;低比转速离心泵加大系数的计算方法探讨
延伸阅读
比转速比转速specific speedb一Zht{0门SLJ比转速(speeifiC speed)是反映水力机械技术经济的综合指标。当水头(扬程)、功率或流量都已确定时，比转速直接反映水力机械的转速水平。水轮机比转速和水泵水轮机的水轮机工况比转速计算方法一样，指几何相似的水轮机(水泵水轮机)在lm水头下发出Ikw功率时所具有的转速，用、表示，单位取m·kw。ns一n、八孺HS’4(l)或。，一3 .1 3n.，杯氨两(2)式中，甲为水力效率;n为转速，:/min;P。:为输出功率，kw;H为工作水头，m;Ql!为单位流量，m，/s;n，，为单位转速，:/min。蓄能泵比转速和水泵水轮机的泵工况比转速一般都用流量比转速表示.指蓄能泵(水泵水轮机)扬程为lm、流量为lm，/S时的转速，用，.表示，单位取m·m3/s。、‘产、龟J少，d月注Zr、了‘、或 丫奋)nq=”-万i万nq一。1，丫面五式中，Q，·为流量，m3/s;月。为扬程，m。水轮机、水泵水轮机和蓄能泵在不同的工况点运行，具有不同的比转速值。在工程设计中.对水轮机一般取额定工况点(额定转速nr;额定水头H「;额定功率尸r)的比转速值，对蓄能泵和水泵水轮机一般取最大流量点(通常为额定转速n，;最小扬程Hp。:;最大流量QP.。二)的比转速作为代表，用来比较比转速的高低。由于在相同水头(扬程)、功率(流量)条件下，所选用的水轮机(或水泵水轮机、蓄能泵)比转速高，说明其额定转速高、机组尺寸小，对降低机组造价有利，口直径大于进口直径.同时，比转速愈低，其导叶相对高度愈小，进水流道愈狭窄，转轮叶片数愈多。轴流式水轮机、水泵水轮机、蓄能泵也有类似规律.所以提高比转速是近代水力机械发展的主要趋势之对反击式水轮机、水泵水轮机、蓄能泵，比转速提商也惫味着转轮(叶轮)内水流速度加大，空化条件恶化。因此，它们的比转速受空化的限制，提高十分缓慢.对冲击式水轮机，当射流直径和转轮直径已确定时，其比转速与喷嘴数的平方根成正比.因此，提高冲击式水轮机比转速的途径主要是增加喷嘴数.目前，国际上喷嘴数最多的冲击式水轮机具有6个喷嘴。但喷嘴数的增加也受到结构、强度等限制，特别是水头超过8。。m时。水力机械比转速的高低与其型式、适用水头(扬程)范围有较为明显的对应关系。
