龙抬头泄洪洞水力特性研究

结合某泄洪洞改建工程，利用三维紊流模型对不同进口高程的龙抬头泄洪洞水力特性进行比较研究。首先，利用龙抬头泄洪洞水工模型试验结果验证了数值模拟结果的可靠性。然后，针对四种进口高程的龙抬头泄洪洞，从泄洪洞泄流能力、水头损失及水流流态等方面进行了比较。结果表明，在保证各曲线段光滑平顺的前提下，进口高程对泄洪洞、水头损失及流态的影响不大。研究成果可为泄洪洞的设计提供依据。

Study on hydraulic characteristics of ogee discharge tunnel

Based on a reconstruction project of a discharge tunnel，a comparative study is made among hydraulic characteristics of ogee discharge tunnels with their intakes on various elevations by a 3-D turbulence model. At first，the reliability of the result from the numerical simulation is demonstrated with the result from the hydraulic model test for the ogee discharge tunnel，and then a comparison is made among four ogee discharge tunnels with the intakes at various elevations in the aspects of discharge capacity，head loss and flow pattern of the tunnel. The result shows that there is no larger impact from the intake elevation on the flow rate，head loss and flow pattern of the tunnel，if all the curved sections of it are ensured to be level and smooth. The study made herein can lay a basis for the design of the discharge tunnel.