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阶梯隔舌对离心泵压力脉动和径向力影响的数值模拟（Numerical Simulation on Pressure Fluctuations and Radial Hydraulic Forces in Centrifugal Pump with Step-tongue）
离心泵 阶梯隔舌 动静干涉 径向力
2010/12/29
通过改变隔舌形状，采用SST模型分别对常规隔舌和阶梯隔舌蜗壳的离心泵进行全流道非稳态数值模拟。通过模拟分别获得了常规隔舌和阶梯隔舌蜗壳的离心泵压力脉动特性、作用在蜗壳和叶轮上的径向力特性，并对其进行比较分析。结果表明：采用常规隔舌和阶梯隔舌时，离心泵进出口压力、作用在蜗壳和叶轮上的径向力均随时间呈周期波动，脉动频率均以叶片通过频率为主；采用阶梯隔舌蜗壳后，进出口压力大小值和脉动幅值均明显减弱，高频...
离心泵压力脉动特性分析（Numerical Investigation of Unsteady Pressure Fluctuations in Centrifugal Pump）
离心泵 数值模拟 压力脉动
2010/12/28
为了研究压力脉动在离心泵不同位置的变化规律及其关系，利用CFD技术对离心泵内部流场进行多工况定常与非定常三维数值模拟，得到内部流场特性及计算点的压力脉动情况，并对其进行频域分析。结果表明，设计工况和大流量工况下，叶频是主要影响频率，而在小流量工况下，轴频是主要影响频率；压力脉动幅值随偏离工况的情况而变化，同一流量下，流道的进出口压力脉动变化大。
The pressure fluctuations in a fluidised bed are a result of the actions of the bubbles. However, the bubbles may be influenced by the air supply system and by the pressure drop of the air distributor...
Comparison of Intraocular Pressure Fluctuations Measured by Goldmann Applanation Tonometer and Pulsatile Ocular Blood Flow Analyser
glaucoma intraocular pressure Goldmann applanation tonometry pulsatile ocular blood flow analyser
2009/4/20
Evaluation of the effect of glaucoma medication is restricted by measurement of IOP as a dynamic physiological parameter. Present paper aimed to compare IOP fluctuations over time using Goldmann appla...
Pressure Fluctuations on the Open Ocean Floor Over a Broad Frequency Range：New Program and Early Results
Pressure Fluctuations Broad Frequency Range Open Ocean Floor
2009/2/19
A two-month ocean-floor pressure record obtained 330 km to the east of the main island of Hawaii by means of a Bourdon tube-type transducer with optical readout is discussed in detail. An approach to ...
Pressure Fluctuations on the Open-Ocean Floor off the Gulf of California：Tides, Earthquakes, Tsunamis
Pressure Fluctuations Tides Earthquakes Tsunamis Open-Ocean Floor
2009/2/5
This paper supplements an initial article on sea-floor pressure observations conducted with a sensitive though not “perfectly” stable transducer. A variety of examples are used to demonstrate that a w...