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Water hammer occurs whenever the fluid velocity in vertical lifting pipe systems for deep-sea mining suddenly changes. In this work, the shock wave was proven to play an important role in changing pressures and periods, and mathematical and numerical modeling technology was presented for simulated transient pressure in the abnormal pump operation. As volume concentrations were taken into account of shock wave speed, the experiment results about the pressure-time history, discharge-time history and period for the lifting pipe system showed that: as its concentrations rose up, the maximum transient pressure went down, so did its discharges; when its volume concentrations increased gradually, the period numbers of pressure decay were getting less and less, and the corresponding shock wave speed decreased. These results have highly coincided with simulation results. The conclusions are important to design lifting transporting system to prevent water hammer in order to avoid potentially devastating consequences, such as damage to components and equipment and risks to personnel. 相似文献
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以垂直悬臂提升管道为研究对象,应用有限元软件ADINA对其输送过程进行流固耦合效应特性分析。本文应用有限元软件ADINA对扬矿管道进行管内流体—管道—管外流体三者流固耦合模态分析。首先建立了扬矿管道流固耦合有限元模型,得到了不同输送矿石体积浓度、管道截面尺寸下的前6阶固有频率和振型,继而比较了上述条件下三者耦合、二者耦合及无耦合情况的固有频率,讨论了流固耦合作用对管道固有频率的影响。研究结果表明:(1)扬矿管道流固耦合效应下其固有频率随着管内输送矿石颗粒浓度的增大而降低,考虑管内流体—管道—管外流体三者流固耦合时的管道固有频率较只考虑管内流体—管道二者耦合和不考虑流固耦合时要小,影响系数也相应降低;(2)流体对管道流固耦合固有频率的影响程度随着相对厚度d值的增大而减小,在考虑管内流体—管道—管外流体三者流固耦合时管道固有频率较只考虑管内流体—管道二者耦合相对误差增大;(3)在实际的扬矿管道输送中应该考虑输送流体颗粒浓度、不同相对管道壁厚、管内流体—管道—管外流体三者流固耦合作用对固有频率的影响,尽量使管道固有频率远离工作频率,避免共振情况的发生分析结果对扬矿管道的动态响应计算、结构设计和减振研究具有一定的指导意义。 相似文献
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浸没于水中的粗颗粒管道输送系统,由于受到泵、内部两相流及外部流体三者的耦合激励,管道系统振动将对管道输送参数和安全稳定性产生严重影响。为了深入分析水下管道输送系统工作时振动的特性,设计了一套振动测试,对管道系统振动进行了测试,获取管道在不同工况下的时域波形,通过快速傅里叶变换对振动信号进行频谱分析。试验结果表明:随着输送体积浓度增加,X与Y方向的最大振动幅度随着体积浓度增大而增大,但是Z方向的最大振动幅度则是随着体积浓度增加而降低;同一输送浓度情况下,Y方向振动幅度最大,X方向次之,Z方向最小;随着输送浓度提高,流体紊流引起的管道振动加剧。这些结论将为深海采矿管道支撑结构设计和减振提供参考。 相似文献
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