基于等截面摩擦管流和自由流阻力的气力输运计算模型
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V216.5

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工信部专项科研项目


Calculation model of pneumatic transport based on constant cross section friction pipe flow and free flow resistance
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    摘要:

    冰雹连续抛射装置中使用压缩空气输运冰雹颗粒,为研究冰雹抛射运动规律,通过建立对应的气力输运计算模型,研究了冰雹抛射速度规律,分析计算结果指导冰雹抛射装置设计。将压缩空气在系统中的流动简化为流体网络。针对等截面摩擦管流,其抛射压力一定即边界条件一定,应用Runge-Kutta法求解该初值问题,获取抛射管沿程的总压、静压等参数分布。使用颗粒自由流阻力模型对颗粒在抛射管内的受力进行分析,从而得到其运动过程及最终抛射速度。对影响抛射速度的关键因素进行分析,结果表明:随着抛射气源压力的增大,空气流量和抛射速度逐渐增大,抛射速度增长逐渐缓慢;随着抛射管长度的增大,空气流量逐渐减小,抛射速度先增大后保持不变;随着抛射管内径增大,空气流量指数型增长,抛射速度也在增大,但增长趋势逐渐缓慢。可见抛射管管径不宜太大,管长不宜太长,计算结果对试验装置设计具有指导意义。

    Abstract:

    Compressed air is used to transport hail particles in the hail continuous ejection device. In order to study the hail ejection motion low the corresponding pneumatic transport calculation model is established to study the hail ejection velocity velocity law, and the calculation results are analyzed to guide the design of hail ejection device. The flow of compressed air in the system is simplified as a fluid network. For the flow in friction pipe with constant cross-section, the initial value problem is solved by Runge Kutta method to obtain the distribution of total pressure, static pressure and other parameters. The free flow resistance model of particles is used to analyze the force of particles in the ejection pipe, and the motion process and final ejection velocity are obtained. The key factors affecting the ejection velocity are analyzed. The results show that with the increase of the air pressure, the air flow and the ejection speed increase gradually, and the ejection speed increases slowly; With the increase of the length of the ejection tube, the air flow rate decreases gradually, and the ejection velocity first increases and then remains unchanged; With the increase of the inner diameter of the ejector tube, the air flow increases exponentially, and the ejection speed also increases, but the growth trend is gradually slow. It can be seen that the diameter and length of the ejector pipe should not be too large. The calculation results are of guiding significance for the design of the test device.

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孙科,薛文鹏,郭佳男,等. 基于等截面摩擦管流和自由流阻力的气力输运计算模型[J]. 科学技术与工程, 2022, 22(12): 5067-5073.
Sun Ke, Xue Wenpeng, Guo Jianan, et al. Calculation model of pneumatic transport based on constant cross section friction pipe flow and free flow resistance[J]. Science Technology and Engineering,2022,22(12):5067-5073.

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  • 收稿日期:2021-06-20
  • 最后修改日期:2022-01-09
  • 录用日期:2021-11-30
  • 在线发布日期: 2022-05-07
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