水泵进水池底部压力脉动特性试验

发布时间：2018-02-28 19:06

本文关键词： 轴流泵进水池底部压力传感器压力脉动模型试验　出处：《农业机械学报》2017年11期 　论文类型：期刊论文

【摘要】：为了研究泵站进水池中喇叭管下方漩涡产生的机理,探索进水池底部喇叭管下方水流压力脉动与漩涡产生的关系,在进水池底部喇叭管口下方布置20个压力脉动监测点,在转速2 200 r/min时进行了多个不同工况点的压力脉动试验。通过对水流压力脉动的时域特性、频域特性及进水池底部喇叭管下方的压力分布进行分析,揭示了轴流泵喇叭管下方水流压力脉动的规律及压力分布与漩涡之间的关系。进水池底部压力脉动的主频是叶轮转频的2倍,说明轴流泵进水池底部喇叭管下方水流的压力脉动仍然受到叶轮旋转的影响;大流量工况下,喇叭管下方容易产生漩涡,且发生频率高,持续时间长,主要集中在喇叭管下方右前方的位置;小流量工况下,喇叭管下方也能产生漩涡,但发生频率低,持续时间短,主要集中在喇叭管内部正前方的位置。在不同工况下发生漩涡的位置与进水池底部喇叭管下方低压区位置相对应。
[Abstract]:In order to study the mechanism of vortex generation in the bottom horn pipe of pumping station and to explore the relationship between pressure fluctuation and vortex generation under the bottom horn pipe, 20 pressure pulsation monitoring points are arranged under the bottom horn pipe entrance of the inlet pool. Pressure pulsation tests were carried out at 2 200 r / min at different operating conditions. The characteristics of pressure fluctuation in time domain, frequency domain and pressure distribution under the horn tube at the bottom of the inlet pool were analyzed. The law of pressure pulsation under the horn tube of axial flow pump and the relationship between pressure distribution and swirl are revealed. The main frequency of pressure pulsation at the bottom of the inlet pool is twice as frequent as the frequency of blade rotation. It shows that the pressure pulsation of the flow under the horn tube at the bottom of the tank of axial flow pump is still affected by the rotation of the impeller. Under the condition of large flow rate, the vortex is easily produced under the horn tube, and the frequency is high and the duration is long. It is mainly concentrated in the position at the right front of the bottom of the horn tube. Under the condition of small flow rate, the vortex can also be produced under the horn tube, but the frequency is low and the duration is short. The vortex position in different working conditions corresponds to the position of low pressure area under the bottom horn tube at the bottom of the tank.
【作者单位】：扬州大学水利与能源动力工程学院;
【基金】：“十二五”国家科技支撑计划项目(2015BAD20B01-02) 国家自然科学基金项目(51279173、51609210) 江苏省自然科学基金项目(BK20150457) 江苏高校优势学科建设工程项目(PAPD) 2017江苏省研究生科研创新工程项目(KYCX17_1881)
【分类号】：TV131.6;TV675

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