混输叶片泵是多相混输过程中的关键设备,其综合性能的提高对系统的输运能力至关重要。为揭示动静叶间距对混输叶片泵气液固三相流动特性的影响,基于Euler多流体模型,对某气液固混输叶片泵动静叶间距分别为8、10、12、14、16 mm时的内部流体流动进行了数值模拟。结果表明,当动静叶间距由8 mm增加到16 mm,混输叶片泵的扬程和效率分别下降了0.47 m和1.38%,且下降趋势可分为骤降区Ⅰ、缓变区和骤降区Ⅱ。不同动静叶间距下,气液固混输叶片泵内压强、固体体积分数、气体体积分数等分布规律相似,但随着动静叶间距增加,气液固混输叶片泵叶轮和导叶进出口压强差降低,气体和固体的聚集程度增大,且液体撞击导叶叶片压力面最剧烈的位置逐渐前移,导叶内涡量增强,涡结构更加明显,从而导致混输叶片泵输运性能降低。研究成果可为气液固混输叶片泵设计过程中动静叶间距的选取提供参考。
Abstract
[Objective] Multiphase rotodynamic pumps are widely used in multiphase mixed transport processes, including petrochemicals, agricultural irrigation, urban water supply, and drainage, attributed to their advantages of compact structure and good operation under high-speed and high-sand content conditions. The performance of these pumps is crucial for the transport capacity of the mixed transport system; thus, the improvement of their performance has always been a research interest. The impeller-guide vane axial distance of the gas-liquid-solid multiphase pump can seriously affect its transportation performance, but is rarely researched. [Methods] Herein, a multiphase rotodynamic pump with impeller-guide vane axial distances (d) of 8, 10, 12, 14, and 16 mm were modeled via UG-NX. The inlet and outlet pipelines, as well as impellers and guide vanes, were meshed via ICEM-CFD and TurboGrid, respectively. Based on the Euler multiphase flow model, computational fluid dynamics (CFD) numerical simulations were conducted to reveal the influence law of d on the comprehensive performance, including the head, efficiency, pressure, gas void fraction (GVF), solid void fraction (SVF), vorticity, and vortex structure for the gas-liquid-solid multiphase rotodynamic pumps. [Results] The adopted accuracy of the numerical methods was verified through experiments. The numerical results revealed that as d increased from 8 mm to 16 mm, the head and efficiency of the multiphase rotodynamic pump showed an overall decreasing trend; the head and efficiency of the pump declined by 0.45 m and 1.38%, respectively. As d increased from 8 mm to 10 mm, the head and efficiency of the multiphase rotodynamic pump declined by 0.21 m and 0.52%, respectively, which was recorded as performance plummet Ⅰ; as d increased from 10 mm to 14 mm, the head and efficiency of the multiphase rotodynamic pump declined by 0.09 m and 0.12%, respectively—recorded as performance moderation; as d increased from 14 mm to 16 mm, the head and efficiency of the multiphase rotodynamic pump declined by 0.15 m and 0.74%, respectively—recorded as performance plummet Ⅱ. The change in d had a more significant influence on the flow state in the guide vane than that in the impeller. As d increased, the pressure difference decreased from the impeller inlet to the guide vane outlet, GVF at the trailing edge and SVF near the pressure surface at the leading edge of the guide vane blades gradually increased, the vorticity in the multiphase rotodynamic pump increased, and the vortex structure remained prominent, decreasing the overall pump performance. [Conclusions] The increase in d will reduce the head and efficiency of the multiphase pump and make the internal flow more turbulent. However, it will strengthen the rotor-stator interaction if d is exceedingly small. Therefore, the value of d should be selected from the performance moderation in the optimization design of such pumps.
关键词
混输叶片泵 /
动静叶间距 /
气液固三相流动 /
涡量 /
数值模拟
Key words
multiphase rotodynamic pump /
impeller-guide vane axial distance /
gas-liquid-solid flow /
vortex /
numerical simulation
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基金
国家自然科学基金资助项目(52109107;52279092);清华大学水沙科学与水利水电工程国家重点实验室开放基金项目(sklhse-2022-E-03)
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