Taking natural thermo-potential difference as natural draft pressure is ambiguous in theory and not in accord with the actual condition of mines.
把自然热位差当做自然风压在理论上是模糊的，是不符合矿井实际情况的。
This paper describes the design of a portable draft pressure tester and analyses its architecture and the working principle of its main module, and also discusses its accuracy.
本文介绍一种便携式微差压测试仪的设计，详细分析它的系统结构以及主要模块工作原理，并对它的精度进行讨论。
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。
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。
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。
Many study results showed that pressure fluctuation in draft tubes is one of the most important factors that affects the stability of turbines.
许多研究成果表明，影响水轮机水力稳定性有多种因素，其中一个重要因素是尾水管内水流的压力脉动。
Roots draft fan air capacity is calculated and the property curve is drew, and control principle of constant pressure complementary air device is discussed.
计算出罗茨风机的风量并绘制出风机的性能曲线；论述了恒压补气装置的控制原理。
For Francis turbines, the pressure pulsation in draft-tubes induced by helical vortex rope is one of the main problems and it would seriously affect the safe operation of the unit.
混流式水轮机尾水管内螺旋形涡带引起的压力脉动是造成混流式水轮机组振动的主要根源之一，严重威胁机组的安全运行。
The result shows that pneumatic V type draft mechanism is suitable for large draft technology in production, and if weighing roving quantum, yarn quality is better than pressure of spring cradle.
结果表明，气动V形牵伸机构在生产中适合大牵伸工艺，粗纱定量加重，成纱质量较弹簧摇架加压好。
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 an increase in the draft or a decrease in the cabin pressure, the natural heave period shows an increasing trend.
随着吃水的加大或分舱内气压的减小，垂荡固有周期值有增大的趋势。
Experimental studies on pressure fluctuation in draft tubes of Francis turbines have bean conducted, simulating operating conditions of the Three Gorges Hydraulic Power Station's turbines.
以三峡水电站水轮机运行工况为模拟条件进行了混流式水轮机尾水管压力脉动试验研究。
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。
Pressure fluctuations with high or low frequency can lead to acute cavitation damage in draft tubes or vibration of the vane of turbine.
由于各种原因产生的高频和低频的压力脉动会使尾水管内部产生严重的空蚀破坏或者诱发水轮机叶片产生振动等问题。
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。
As long as all of the low pressure gas and draft switches are satisfied the fuel gas trip system will be unaffected when the 125 VDC power is restored.
应翻译为只要所有低压气体和负压开关保持正确位置，当125伏特直流电源恢复后燃料气跳车系统不会被影响。
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 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。
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。
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