开式水槽配置中的无阀泵送与非稳定性狭窄

IF 1.8 Q3 MECHANICS Fluids Pub Date : 2024-06-12 DOI:10.3390/fluids9060141
C. Manopoulos, D. Mathioulakis
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引用次数: 0

摘要

这项研究探讨了非稳定狭窄的有益作用,这种非稳定狭窄不受任何外部能源的驱动,是提高液压回路(包括开式水箱)中无阀泵流量的一种手段。在我们之前的研究中,首次在水平闭合回路中引入了后一种狭窄的概念,与此不同的是,这里考虑了重力因素。狭窄颈部的横截面积由流体压力和可调节张力的弹簧从外部施加的反作用力控制。夹钳定期压缩和减压泵软管的一部分,频率为 5 赫兹至 11 赫兹,压缩率为 24% 至 65%。当 Ab = 24% 和 Ab = 38% 时,狭窄的存在使净流速分别增加了 19 倍和 6.3 倍;而当 Ab = 65% 时,流速相当。在有狭窄的情况下,容积效率从 30% 到 40% 不等,在没有狭窄的情况下,容积效率从 2% 到 20% 不等。狭窄处的作用是造成单向流动,在管道压缩时打开,在减压时关闭。沿柔性管向刚柔管交界处的压力振幅增大(由于波反射的结果),狭窄处的存在明显减弱了压力振幅,而流速脉动在峰值净流速时不超过平均值的 10%。
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Valveless Pumping with an Unsteady Stenosis in an Open Tank Configuration
This work examines the beneficial role of an unsteady stenosis, not driven by any external energy source, as a means for augmenting the flow rate of a valveless pump in a hydraulic loop, including an open tank. In contrast to our previous work, in which the concept of the latter stenosis was introduced for the first time in a horizontal closed loop, here, gravity was taken into account. The stenosis neck cross-sectional area was controlled by the fluid pressure and the opposing force applied externally by a spring of adjustable tension. A pincher compressed and decompressed a part of the pump’s flexible tube periodically, with frequencies from 5 Hz to 11 Hz and compression ratios Ab from 24% to 65%. The presence of the stenosis increased the net flow rate by 19 times for Ab = 24% and 6.3 times for Ab = 38%; whereas for Ab = 65%, the flow rates were comparable. The volumetric efficiency varied from 30% to 40% under the presence of the stenosis, and from 2% to 20% without the stenosis. The role of the stenosis was to cause a unidirectional flow, opening during tube compression and closing during decompression. The pressure amplitudes along the flexible tube increased towards the rigid–flexible tube junction (as a result of the wave reflections), which were found to be significantly attenuated by the presence of the stenosis, whereas the flow rate pulsations did not exceed 10% of the mean at the peak net flow rates.
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来源期刊
Fluids
Fluids Engineering-Mechanical Engineering
CiteScore
3.40
自引率
10.50%
发文量
326
审稿时长
12 weeks
期刊最新文献
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