轴伸式出水流道内流场数值模拟分析
发布时间：2018-08-31 18:59
【摘要】：为了探讨在导叶出口剩余环量影响下轴伸式出水流道的水力性能,对不同水力模型及不同叶片安放角下的后置轴伸式泵装置采用全结构化网格进行了数值模拟计算,并与实验结果对比验证模拟结果的可信度。对轴伸式出水流道的水力性能进行了分析,发现轴伸出水流道内部流态受导叶出口剩余环量的影响较大,尤其是对小流量工况。水力损失系数不再是某一常数,而是受流态分布相关的一变量。通过对比不同叶片安放角及不同比转数叶轮的出水流道进口断面平均涡角与水力损失系数关系发现,轴伸式出水流道的水力损失系数与进口断面的平均涡角存在一最优值,本次模拟计算下2副叶轮的最优平均涡角4°~5.3°下的水力损失系数为1.62×10~(-4)m·s~2/L~2。通过分析静压与总压沿流线方向的变化趋势明确了小流量工况下环量是引起水力损失的原因,而在大流量工况下流量是引起水力损失的主要原因。
[Abstract]:In order to investigate the hydraulic performance of the axial outlet flow channel under the influence of the residual ring quantity at the outlet of the guide vane, the full structured grid was used to simulate the hydraulic performance of the rear shaft extension pump device with different hydraulic models and different blade placement angles. The simulation results are compared with the experimental results to verify the reliability of the simulation results. The hydraulic performance of the axial outlet channel is analyzed. It is found that the internal flow pattern of the axial outlet flow channel is greatly affected by the residual ring volume at the outlet of the guide vane, especially for the small flow condition. The hydraulic loss coefficient is no longer a constant, but a variable related to the distribution of the flow state. By comparing the relationship between the average vortex angle of outlet passage inlet section and hydraulic loss coefficient of different blade placement angle and different specific rotation impeller, it is found that there is an optimum value between hydraulic loss coefficient and average vortex angle of inlet section. The hydraulic loss coefficient of the two impellers is 1.62 脳 10 ~ (-4) m ~ (-4) m ~ (-2) L ~ (-1) L ~ (2) L ~ (2) at the mean vortex angle of 4 掳~ (5.3) 掳. By analyzing the variation trend of hydrostatic pressure and total pressure along the streamline direction, it is clear that the ring volume is the cause of hydraulic loss under small flow condition, and the main cause of hydraulic loss under large flow condition.
【作者单位】： 扬州大学水利与能源动力工程学院;扬州市勘测设计研究院有限公司;
【基金】：国家自然科学基金项目(51376155) 江苏省自然科学基金项目(BK20150457) 扬州大学科技创新培育基金项目(2015CXJ033);扬州大学研究生科研创新项目(KYLX_1346)
【分类号】：O35
，
本文编号：2215876
[Abstract]:In order to investigate the hydraulic performance of the axial outlet flow channel under the influence of the residual ring quantity at the outlet of the guide vane, the full structured grid was used to simulate the hydraulic performance of the rear shaft extension pump device with different hydraulic models and different blade placement angles. The simulation results are compared with the experimental results to verify the reliability of the simulation results. The hydraulic performance of the axial outlet channel is analyzed. It is found that the internal flow pattern of the axial outlet flow channel is greatly affected by the residual ring volume at the outlet of the guide vane, especially for the small flow condition. The hydraulic loss coefficient is no longer a constant, but a variable related to the distribution of the flow state. By comparing the relationship between the average vortex angle of outlet passage inlet section and hydraulic loss coefficient of different blade placement angle and different specific rotation impeller, it is found that there is an optimum value between hydraulic loss coefficient and average vortex angle of inlet section. The hydraulic loss coefficient of the two impellers is 1.62 脳 10 ~ (-4) m ~ (-4) m ~ (-2) L ~ (-1) L ~ (2) L ~ (2) at the mean vortex angle of 4 掳~ (5.3) 掳. By analyzing the variation trend of hydrostatic pressure and total pressure along the streamline direction, it is clear that the ring volume is the cause of hydraulic loss under small flow condition, and the main cause of hydraulic loss under large flow condition.
【作者单位】： 扬州大学水利与能源动力工程学院;扬州市勘测设计研究院有限公司;
【基金】：国家自然科学基金项目(51376155) 江苏省自然科学基金项目(BK20150457) 扬州大学科技创新培育基金项目(2015CXJ033);扬州大学研究生科研创新项目(KYLX_1346)
【分类号】：O35
，
本文编号：2215876
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