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为解决高水头泄洪时旋流洞内出现较小压强和空化风险等问题,提出了新型的阻塞旋流泄洪洞,该文对设置不同阻塞时的洞内压强特性、增压特性和空化特性进行了模型试验和理论分析。结果表明:设置阻塞后洞内压强增大明显,一定阻塞时起旋器出口附近负压消失;竖井段壁面压强增大主要受起旋器喉口压强影响,旋流洞段主要受切向流速沿径向分布和水流流层厚度影响;随阻塞增大的压强—顶托压强沿程呈分段变化特征,但在竖井洞段和旋流洞段具有较好的保持性;推导了顶托压强的计算表达式并予以试验验证;阻塞大大降低了空化空蚀风险。旋流洞内设置阻塞可以较好地解决高流速时泄洪洞内的负压和空化风险问题。
In order to solve the problems of low pressure and cavitation risk in swirl tunnel with high head discharge, a new type of blocking swirling flood discharge tunnel was proposed. In this paper, the pressure characteristics, Characteristics of the model test and theoretical analysis. The results show that the pressure inside the cave increases obviously when the blockage is set, and the negative pressure near the outlet of the cyclone disappears when the blockage is blocked. The increase of wall pressure in the shaft section is mainly affected by the pressure at the throat of the cyclone. Along the radial distribution and the thickness of the water flow layer thickness; along with the pressure increasing of the blockage, the pressure of the top-capstolong is subdivided into sections, but has good retentivity in the shaft section and the swirl flow section; The calculation of pressure is validated by experiments. Blocking greatly reduces the risk of cavitation cavitation. The setting of clogging in the swirl tunnel can solve the problems of negative pressure and cavitation in flood discharge tunnel with high velocity.