突扩突跌掺气设施后泄槽底板脉动压力试验研究
发布时间：2018-11-15 21:46
【摘要】：有压洞出口后的突扩突跌掺气减蚀设施在水利工程中经常使用。由于水流受边界条件和掺气的影响,其流态和脉动压力往往与普通水槽的情况有很大的不同。通过水工模型试验,对突扩突跌掺气设施后泄槽底板上的脉动压力进行研究,揭示了掺气设施后泄槽底板上不同流动区域的脉动压力特性。从脉动压力的时域过程、均方根值、偏态系数、峰态系数和主频率等多方面得出冲击区、反射区和稳定区脉动压力的特性是不相同的结论。同一流量时,沿流程底板的时均压力都大于脉动压力的均方根值,在冲击区、反射区和稳定区,脉动压力的均方根值分别是同位置时均压力值的约0.5倍、0.6倍和0.7倍。研究成果可为更好地利用突扩突跌掺气设施提供有益的理论和试验依据。
[Abstract]:The sudden expansion after the outlet of the pressure hole is often used in water conservancy projects. Due to the influence of boundary conditions and aeration, the flow pattern and pulsating pressure are often different from those of the common flume. Through hydraulic model test, the pulsating pressure on the bottom plate of the vent after sudden expansion and falling aeration is studied, and the characteristics of fluctuating pressure in different flow regions on the bottom plate of the vent after the aeration are revealed. From the time domain process of pulsating pressure, root mean square value, skewness coefficient, peak state coefficient and main frequency, it is concluded that the characteristics of pulsating pressure in shock zone, reflection region and stable region are different. At the same flow rate, the mean time pressure along the bottom plate is greater than the RMS value of the pulsating pressure, and the RMS value of the fluctuating pressure in the impact zone, the reflection region and the stable region is about 0.5 times of the mean pressure value at the same position. 0.6 times and 0.7 times. The research results can provide a useful theoretical and experimental basis for the better use of sudden expansion and sudden fall aeration facilities.
【作者单位】： 昆明理工大学电力工程学院;陆良县水务局;
【基金】：国家自然科学基金项目(51069002,51269005) 2016年昆明理工大学研究生课外学术科技创新基金
【分类号】：TV135.2
[Abstract]:The sudden expansion after the outlet of the pressure hole is often used in water conservancy projects. Due to the influence of boundary conditions and aeration, the flow pattern and pulsating pressure are often different from those of the common flume. Through hydraulic model test, the pulsating pressure on the bottom plate of the vent after sudden expansion and falling aeration is studied, and the characteristics of fluctuating pressure in different flow regions on the bottom plate of the vent after the aeration are revealed. From the time domain process of pulsating pressure, root mean square value, skewness coefficient, peak state coefficient and main frequency, it is concluded that the characteristics of pulsating pressure in shock zone, reflection region and stable region are different. At the same flow rate, the mean time pressure along the bottom plate is greater than the RMS value of the pulsating pressure, and the RMS value of the fluctuating pressure in the impact zone, the reflection region and the stable region is about 0.5 times of the mean pressure value at the same position. 0.6 times and 0.7 times. The research results can provide a useful theoretical and experimental basis for the better use of sudden expansion and sudden fall aeration facilities.
【作者单位】： 昆明理工大学电力工程学院;陆良县水务局;
【基金】：国家自然科学基金项目(51069002,51269005) 2016年昆明理工大学研究生课外学术科技创新基金
【分类号】：TV135.2
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