【摘要】：有壓洞出口后的突擴突跌摻氣減蝕設施在水利工程中經(jīng)常使用。由于水流受邊界條件和摻氣的影響,其流態(tài)和脈動壓力往往與普通水槽的情況有很大的不同。通過水工模型試驗,對突擴突跌摻氣設施后泄槽底板上的脈動壓力進行研究,揭示了摻氣設施后泄槽底板上不同流動區(qū)域的脈動壓力特性。從脈動壓力的時域過程、均方根值、偏態(tài)系數(shù)、峰態(tài)系數(shù)和主頻率等多方面得出沖擊區(qū)、反射區(qū)和穩(wěn)定區(qū)脈動壓力的特性是不相同的結(jié)論。同一流量時,沿流程底板的時均壓力都大于脈動壓力的均方根值,在沖擊區(qū)、反射區(qū)和穩(wěn)定區(qū),脈動壓力的均方根值分別是同位置時均壓力值的約0.5倍、0.6倍和0.7倍。研究成果可為更好地利用突擴突跌摻氣設施提供有益的理論和試驗依據(jù)。
[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.
【作者單位】： 昆明理工大學電力工程學院;陸良縣水務局;
【基金】：國家自然科學基金項目(51069002,51269005) 2016年昆明理工大學研究生課外學術(shù)科技創(chuàng)新基金
【分類號】：TV135.2

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