导流洞改建为孔板泄洪洞水力学问题研究

Study on hydraulic problems of spillway tunnels with orifices reformed from diversion tunnel

本文对导流洞改建为孔板泄洪洞时的孔板体型与阻力系数的关系、出口水流收缩系数的计算、泄流能力的计算、雷诺数对孔板初生空化数的影响、初生空化数与体型的关系等进行了较深入的研究，提出了系统的计算公式和设计方法．文中提出的消涡环不仅抑制了孔板上游的角隅漩涡。

The relationship between the configuration of orifices and the hydraulic resistances, the coefficient of contraction at the outlet,the discharge capacity, and the effect of Reynolds number as well as the orifices configuration on incipient cavitation number are studied in detailed in the model test.The formulas for calculation of hydraulic design for this kind of tunnel are suggested.The vortex suppressing ring proposed by the authors not only play the role of restraining the occurrence of cavitation but also enhancing the effectiveness of energy dissipation and strengthening the structure of the orifices.