Amplitude and phase of pressure fluctuation at the inlet of draft tube as well as the inner flow in draft tube are analyzed in detail.
详细分析了尾水管进口截面的压力脉动的幅值和相位，并对尾水管内的流动做了分析。
From the experiments and succedent computations, the importance of baffle is found that it can distribute energy evenly in ALR and may be used to replace the draft tube.
通过试验和计算发现，挡板在反应器中起到均匀分布能量的作用，并可取代导流筒。
Hydrodynamics and desulfurization characteristic were compared for rectangular draft tube spouted bed and rectangular spouted bed and conical-cylindric spouted bed.
对无导流管矩形喷动床与导流管矩形喷动床及柱锥形喷动床的流体力学性能和脱硫性能进行了对比。
When ratio of draft tube diameter to reactor diameter was 0.5, a maximum in solid loading appeared.
固体相含率先增加后减少，对固体相含率而言，当导流筒直径与反应器直径之比为0 5时，固体相含率最大；
The results show that the rotating draft tube can improve the movement of particles and change the distribution of particle in the annular.
结果表明，旋转导向管能改善物料的运动特性，并能改变物料落在环形区时的分布。
Combined with the Taligan Powerplant Project of Ir an, common draft tube is remodeled to high-and-narrow type draft tube.
结合伊朗塔里干电站项目，将普通尾水管改型设计成窄高型尾水管。
Methods 34 cases who need to intromit stomachic draft tube were randomly divided into two groups according to normal method and improved method.
方法对34例口腔颌面部肿瘤切除术后需插胃管的患儿按常规法和改进法随机分为两组。
Finally, separation flow, secondary flow and multi-scale eddy structure are simulated, it indicates that SST model can give a good prediction of turbulence in the draft tube.
计算获得了分离流、二次流和多尺度旋涡结构，表明SST模型能很好地预测尾水管内的湍流流动。
Stress of surrounding concrete of each draft tube is analysed by the finite-element method under condition of the highest hydraulic pressure and the variable regularity of stress is obtained.
基于有限元法，分析了两个尾水管在各自最大内水压力条件下外围混凝土的受力，得到各自的应力变化规律和特点。
The comparison between the calculation results and experimental data indicates that the calculation in this paper can medict the pressure fluctuation in draft tube very well.
通过与模型试验结果进行比较可以看出，本计算能够比较准确地预测尾水管内的压力脉动。
With the FFT analysis it is analyzed that the pressure surge changing laws in the taper pipe and draft tube in time domain and frequency domain.
通过水压力脉动数据的FFT频谱分析，研究了直锥段和尾水管内部在不同位置不同工况下的压力脉动在时域及频域上的变化规律。
To study the performance of Spouted Bed with Rotating Draft Tube (RDTSB), the rapeseeds were taken as raw material for carrying out the fluid dynamics experiment.
为研究“新型旋转导向管喷动床”的性能，采用油菜籽为原料，进行了流体动力学试验。
In the experimental study, the pressure surge data are acquired at 26 points from the taper pipe intake to the draft tube exit distributing at 8 sections under 6 stable operating conditions.
对水轮机模型，测取了从直锥段进口至尾水管出口8个截面共26个测点在6个稳定运行工况下的水压力脉动数据。
To diagnose accurately vortex rope in draft tube of hydraulic turbine, this paper presents a new method of fault diagnosis based on wavelet packet and neural network.
为精确诊断水轮机尾水管涡带，该文提出一种基于小波包特征熵的神经网络故障诊断新方法。
The commercial code of CFD (Computational Fluid Dynamics), FLUENT-5, has been used to numerically simulate the flow field in the draft-tube agitated tank.
利用计算流体力学软件FLUENT-5，对带导流筒搅拌槽内的流场进行了数值模拟。
The volumetric oxygen transfer coefficients and the fluid circulation rates in the draft tube are correlated based on the…
根据实验数据，建立了反应器中的氧传递和提升筒中流体流动的关联式。
The mixing time prolonged by introducing a draft tube.
增加导流筒可以使液相混合时间延长。
The unsteady flow in a draft tube of Francis turbine under the off-design operation is produced by the dynamic behavior of a helical vortex rope with the dead core.
混流式水轮机在非设计工况点下运行时，尾水管内部的非定常流动是由死水域和螺旋涡带的动态行为引起的，尾水管上部的螺旋涡带旋转引起流动的基频脉动。
This is caused principally by the vortex core of whirling water in the draft tube.
这种振动主要是由尾水管中的旋涡带所致。
In case of the turbine is operated departing the optimum condition, the low presure and the vortex band will be established in the draft tube centre by the flow circulation.
水轮机在偏离最优工况运行时，水流的环量会使尾水管中心产生低压并形成涡带。
Defined parameters were appropriate, which can reflect main flow in draft tube. It also instructed that the calculation was correct.
求解过程中各参数的设置合理，可以较好地反映尾水管中的主要流动现象，同时也说明了流场计算结果的正确性。
Disclosed is a pressure dredging device without a rod, mainly comprising a draft tube, a connecting tube, a handle, a compressing ring and a regulating pawl.
一种无杆压力疏通器，主要包括有引管、连管、手柄、压缩圈以及调节爪。
This paper gives the flow simulation of hydraulic turbine draft tubes. Then, the calculation formula of the frequency and force of vibration of the draft tube are derived.
本文通过尾水管内流动的模拟，导出了由尾水涡带所引起的周期性振动的振动频率和脉动压力的计算公式。
Theoretical analysis and experimental works have been carried out to study the solid particle attrition phenomena in a spouted-fluidized bed with a draft tube.
本文对导向喷动流化床中固体颗粒的破损进行了理论分析和实验测试。
The pressure fluctuation in the draft tube is obtained. The calculated pressure fluctuation frequency agrees with the test data.
数值模拟得到的尾水管中压力脉动的频率，与湖北中试所在隔河岩进行测试的结果基本一致。
There iss strong vibration in the draft tube of a Francis turbine or axial flow fixed blade propeller hydraulic turbine when the turbine is running on part loading.
混流和轴流定浆式水轮机在部分负荷下运行时，尾水管中常出现较为强烈的振动。
Besides, a notable vortex rope and a reverse flow structure exist in the draft tube in smaller wicket gate openings, which can easily lead to the instability in operation of the pump-turbine.
此外，发现开度较小时尾水管内存在明显的涡带和回流涡结构，容易导致机组运行的不稳定；
The water pressure at the entrance of draft tube rises in the process of load rejection, but the pressure behind the guide vanes drops rapidly following the closing of operation.
总体来说，尾水管进口断面水压在甩负荷过程中是升高的，而导叶后断面的水压随导叶关闭急剧下降。
The water pressure at the entrance of draft tube rises in the process of load rejection, but the pressure behind the guide vanes drops rapidly following the closing of operation.
总体来说，尾水管进口断面水压在甩负荷过程中是升高的，而导叶后断面的水压随导叶关闭急剧下降。
应用推荐