The 3d cavitation flow field in the turbine runner and 3d cavity region onthe blade are predicted by the numerical simulation firstly.
通过数值模拟首次实现了混流式水轮机转轮内王维空化流场和叶片上三维空穴区域的预测。
Aiming at the high vaporous pressure and easy cavitation occurrence of water, the cavitation flow in orifices using water as working media is analysed theoretically by applying cavitation model.
针对水的汽化压力高、容易发生气穴的特点，应用气穴模型理论对阻尼小孔中以水作为工作介质时的流动特性进行理论分析。
In the process conditions permit, the change in pump flow, head, speed and medium operating temperature operating parameters, to avoid the occurrence of cavitation.
在工艺条件允许的情况下，改变泵的流量、扬程、转速及介质的操作温度等操作参数，可以避免汽蚀的发生。
Cavitation number is affected by several variables, each of them affects the flow field differently, and it is necessary to study the influence by each of them.
对于空泡问题的无量纲数也展开进行了研究，结果表明不同参数变化引起的不同空泡数对流场中空泡的结构有一定的影响。
This paper introduced control valve selection and its application based on the theory of flow characteristic, pressure drop, flashing, cavitation and noise.
针对调节阀的流量特性、压降、闪蒸、气蚀及噪音等问题介绍了调节阀在选型和应用中的要点。
It is briefly introduced that a set of high flow cavitation noise measuring system has been used recently.
扼要地介绍了一套最近研制成功的高速水流空化噪声测试系统。
The main effects on cavitation performance of large-scale mixed flow pump used in a special propulsion system are analysed.
分析了用于推进系统的大功率混流泵影响汽蚀特性的主要因素。
The ventilated cavitation number decreased with the ventilation flow rate by exponential law at constant velocity.
在流速恒定情况下，随通气率的增大，通气空化数逐渐减小，呈指数规律衰减。
This paper gives, from the energy equation for rapidly varied flow, the equations for the calculation of the curve of equal cavitation number in consideration of friction losses.
本文在考虑水流阻力的情况下，提出计算等空化数曲线的方程组，并给出电算程序。
Metal pressure can drop several atmospheres below the metal vapor pressure in areas of very fast flow, possibly causing cavitation and erosion.
金属制的压力能在非常快速流量的面积中在金属制的蒸汽压力下面放弃一些大气，可能地引起涡轮真空和冲蚀。
The key parts of the cavitation characteristics of Gongboxia rotary flow tunnel still need further observation and testing.
公伯峡旋流泄洪洞的这些关键部位的空化空蚀特性尚需进一步观测和检验。
Application Cavitation, liquid hammer and pressure peak may occur in hydraulic systems with changes in flow velocity, e. g. fast closing of a valve or pump starts and stops.
应用空化，液体铁锤和压力顶峰可能用在流动速度方面的变化在液压系统里发生，例如一阀门或者泵的快关闭起停。
The flow field cavitation inside the water hydraulic poppet valve was modeled and analyzed by using the software of FLUENT, and the relation between the cavitation and the pressure was investigated.
对纯水液压锥阀阀口流场气穴进行了数学建模，并用FLUENT软件进行了仿真分析，从而得到气穴发生的程度与流场压力分布之间的关系。
The hydraulic cartridge cone valve is chosen for the study of possibility to explore its effects of geometry parameters and boundary condition on flow field and cavitation of cone valve.
以插装型液压锥阀为研究对象，研究了几何结构参数及边界条件对锥阀流场及气穴现象的影响。
Established a mathematical model to simulate the instantaneous flow fields and cavitation by combining the weakly compressible fluid theory and the Large Eddy Simulation method.
建立了微可压缩流理论和大涡模拟方法相结合的空化流数学模型，为四川大学工学博士学位论文孔板泄洪洞空化初生的研究开辟了一条新途径。
To the problem of cavitation and shock that appears in the outside circulation piston pump running, the relation-ship between rotor profile and dead volume, flow rate and cavitation were analyzed.
针对外环流活塞泵运转时出现的汽蚀、震动问题，从理论上分析了转子型线与闭死容积、流速变化和发生汽蚀的内在关系；
Pump cavitation, the flow should be run down or slow down;
泵产生汽蚀时，应把流量调小或降速运行；
Based on the theory of two-phase flow, the equation of the pressure gradient is found for the short pipe in cavitation jet cutting set.
基于两相流体动力学的理论，建立空蚀射流切割装置中短管内的压力变化梯度的基本方程式；
A cavitation bubble in a cascade not only changes the flow field of the cascade, but also makes it difficult to calculate the flow field because of its unknown shape.
叶栅汽蚀绕流时所产生的汽穴不仅使流场发生了变化，而且其未知的形状使流场的求解变得十分困难。
The result showed that the structural parameters could greatly affect the distribution of flow field and the initiation of cavitation.
研究结果表明：阀的结构参数对流场的分布和气穴的产生有较大的影响。
One of the main problems of spillway tunnel with large discharge and high velocity flow is the cavitation damage.
高水头、大流量泄洪洞内高速水流问题主要问题之一是水流空化引起过流表面空蚀。
The paper discusses the effect of rotation rate on property parameters such as flow volume, delivery lift, power and cavitation etc.
论述了离心泵转速提高对流量、扬程、功率、汽蚀余量等参数的影响。
As the high head, high velocity and large flow of flood discharge, the concrete of spillway tunnel in Xiaowan Hydropower Station is easy to be damaged by cavitation.
小湾水电站泄洪洞在泄洪时具有高水头、高流速、泄量大的特点，对混凝土冲刷力强，容易产生空蚀破坏。
From the view of flow control, the method of cavitation resistance of a pilot-operated water hydraulic valve was investigated.
从流场控制的角度，研究了先导式纯水溢流阀抑制汽蚀方法。
Because of the high water head and high flow speed, the aeration for preventing cavitation erosion becomes more and more important.
由于水头高，流速大，明流泄洪洞的掺气减蚀越来越受到重视。
The theory and experimental results of a new rotating-flow test device for cavitation damage are introduced.
介绍新型旋转水流式空蚀试验装置的原理及使用该装置的试验成果。
Tail pump is widely used in the industrial production. When choosing a pump, the flow rate, lift and the cavitation should be considered.
渣浆泵在工业生产中应用广泛，对泵的选择要考虑流量、扬程和汽蚀匹配。
Because of the cavitation damage owing to the high-velocity flow, the energy dissipator has been faulted seriously.
由于高速水流产生的气蚀破坏，消能工遭到严重破坏。
Because of the cavitation damage owing to the high-velocity flow, the energy dissipator has been faulted seriously.
由于高速水流产生的气蚀破坏，消能工遭到严重破坏。
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