泵站双节式拍门合理开启角度分析

为探究双节式拍门的合理开启角度,以江西鹅湖泵站双节式拍门为研究对象,分析在不同流量工况下,不同开启角度的拍门水力损失以及门后水流流态,得出一个较优的双节式拍门开启角度范围.结果表明:在双节式拍门上节门开度达到约46.00°.下节门开度达到约64.00°时,水力损失较小且其大小几乎不随流量增加发生变化,因拍门水力损失导致的效率下降值已减少至3%左右,而且随着开启角度增大,拍门对泵装置性能以及整体工程运行产生的影响在逐渐减弱.经过分析得出,鹅湖泵站双节式拍门上节门的较优开度约为46.00°~53.00°,下节门的较优开度约为64.00°~70.00°,这与该泵站双节式拍门在运行工况下的开启角度吻合,结果可为双节式拍门在泵站的应用提供借鉴.从多角度分析对比得出的双节式拍门合理开启角度的研究方法具有较高的可行性,值得在其他类型拍门合理开启角度研究中推广应用.

Analysis on reasonable opening angle of double-stage flap valve in pumping station

To explore reasonable opening angles of double-stage flag valve, the double-stage flap valve of Jiangxi Ehu pumping station was taken as the research object, and the operating angle of the double-stage flap valve was calculated by theoretical formula to determine the test scheme. The hydraulic loss of the flap valve and the flow state of the water behind the flap valve under different flow conditions and different opening angles of the flap valve were studied, and an optimal opening angle range of the double-stage flap valve was obtained. The research results show that the hydraulic loss is small and its size hardly changes with the increase of flow rate when the opening of the upper section of the double-stage flap valve reaches 46.00° and the opening of the lower section door reaches 64.00°. The efficiency decrease caused by the hydraulic loss of the flap valve has been reduced to about 3%, and the flow pattern has been able to develop completely in the culvert. Moreover, with the increase of the opening angle, the impact of the flap valve on the pump device performance and the overall project operation is gradually weakening. Through analysis and research, it is concluded that the optimal opening range of the upper flap valve and the lower flap valve in the double-stage flap valve of Ehu pumping station is 46.00° to 53.00° and 64.00° to 70.00°, respectively. It is consistent with the opening angle of the double-stage flap valve under the operating condition, which can provide reference for the application of double-stage flap valve in the pumping station. By analyzing and comparing from multiple angles, it is concluded that the research method of reasonable opening angle of double-stage flap valve is obtained, which is highly feasible and worthy of popularizing and applying in the research of reasonable opening angle of other types of flap valve.