指排水口内埋设的镀锌钢管或塑料管，有外挑长度，雨水由钢管或塑料管排出，这里的钢管或塑料管称为水舌。
Physical model test and numerical simulation are used to study the hydraulics of the jet nappe of a diversion tunnel.
采用模型试验和数值模拟相结合的方法对导流洞挑射水舌的水力特性进行了研究。
参考来源 - 导流洞挑射水舌的模型试验及数值模拟研究·2,447,543篇论文数据，部分数据来源于NoteExpress
该模型对溅水区进行时空离散，可反映水舌入水形态与喷溅过程对溅水分布的影响。
The splash region disperses over time and space, reflecting the form of the water jets entry and the influence of the splashing process on rainfall distribution.
特别是改善了弯道出口断面的水舌厚度和流速横向分布的均匀性，保证了末端挑流消能的稳定性和安全性。
Especially they improved the thickness of curved way water tongue and the uniformity of current velocity which distribute in a cross section, promise the stability and the safety of the end jet flow.
下部特殊管件设计，消除水舌、水塞、水壅等现象，保持立管内空气畅通，有效保证管道内的压力平衡，可大幅度提高系统的排水能力。
Upper and under connection design which avoid water block, keep air smooth in the pipe, sure the pressure balance in the pipe, is good to improve drainage ability.
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