Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Method for reducing or avoiding cavitation damage of discharge chute and spillway thereof
The invention discloses a method for reducing or avoiding cavitation erosion damage of a discharge chute and a spillway thereof. The method for reducing or avoiding the cavitation erosion damage of the discharge chute is characterized in that the tail structure form of a positive chute type spillway is changed, water flows overflow to a lateral enlarged discharge surface through a widened side weir, the flow direction and the flow state are changed, the flow velocity of the water flows is reduced by the lateral enlarged discharge surface, and the water depth on the lateral enlarged discharge surface is reduced; the water flows are fully aerated on the uneven laterally-enlarged drainage surface, and cavitation erosion damage to the laterally-enlarged drainage surface is reduced and avoided. Due to the adoption of the technical scheme, when flood is discharged, the water flows firstly flow to the discharge chute through a control section, when the water depth is increased to the top of the widened side weir at the tail part of the discharge chute, the water flows turn and are discharged from the widened side weir to the laterally enlarged discharge surface, a bottom plate of the laterally enlarged discharge surface is protected by bed rock or spray anchors, the roughness of a bottom slope is relatively large, and the flow per unit width is reduced; the water flows skim over the bottom plate in a sliding mode to form thin-layer aerated water flows which is converged into a river channel.
本发明公开了一种减小或避免泄槽的空蚀破坏的方法及其溢洪道，是改变正槽式溢洪道尾部结构型式，将水流通过加宽侧堰溢出至侧向扩大泄流面，改变流向和流态，侧向扩大泄流面将水流流速降低，侧向扩大泄流面上水深降低，水流在凹凸不平的侧向扩大泄流面上充分掺气，减免侧向扩大泄流面的空蚀破坏。由于采用了本发明的技术方案，在下泄洪水时，水流先经过控制段流至泄槽，在泄槽尾部，水深增加至加宽侧堰堰顶时，水流转向，由加宽侧堰下泄至侧向扩大泄流面，侧向扩大泄流面底板为基岩或喷锚防护，底坡糙率较大，单宽流量变小，水深变浅，水流成滑掠式掠过底板，形成薄层掺气水流，汇入河道。
Method for reducing or avoiding cavitation damage of discharge chute and spillway thereof
The invention discloses a method for reducing or avoiding cavitation erosion damage of a discharge chute and a spillway thereof. The method for reducing or avoiding the cavitation erosion damage of the discharge chute is characterized in that the tail structure form of a positive chute type spillway is changed, water flows overflow to a lateral enlarged discharge surface through a widened side weir, the flow direction and the flow state are changed, the flow velocity of the water flows is reduced by the lateral enlarged discharge surface, and the water depth on the lateral enlarged discharge surface is reduced; the water flows are fully aerated on the uneven laterally-enlarged drainage surface, and cavitation erosion damage to the laterally-enlarged drainage surface is reduced and avoided. Due to the adoption of the technical scheme, when flood is discharged, the water flows firstly flow to the discharge chute through a control section, when the water depth is increased to the top of the widened side weir at the tail part of the discharge chute, the water flows turn and are discharged from the widened side weir to the laterally enlarged discharge surface, a bottom plate of the laterally enlarged discharge surface is protected by bed rock or spray anchors, the roughness of a bottom slope is relatively large, and the flow per unit width is reduced; the water flows skim over the bottom plate in a sliding mode to form thin-layer aerated water flows which is converged into a river channel.
本发明公开了一种减小或避免泄槽的空蚀破坏的方法及其溢洪道，是改变正槽式溢洪道尾部结构型式，将水流通过加宽侧堰溢出至侧向扩大泄流面，改变流向和流态，侧向扩大泄流面将水流流速降低，侧向扩大泄流面上水深降低，水流在凹凸不平的侧向扩大泄流面上充分掺气，减免侧向扩大泄流面的空蚀破坏。由于采用了本发明的技术方案，在下泄洪水时，水流先经过控制段流至泄槽，在泄槽尾部，水深增加至加宽侧堰堰顶时，水流转向，由加宽侧堰下泄至侧向扩大泄流面，侧向扩大泄流面底板为基岩或喷锚防护，底坡糙率较大，单宽流量变小，水深变浅，水流成滑掠式掠过底板，形成薄层掺气水流，汇入河道。
Method for reducing or avoiding cavitation damage of discharge chute and spillway thereof
一种减小或避免泄槽的空蚀破坏的方法及其溢洪道
SHUAI SHIJIE (Autor:in) / ZHANG YANXIA (Autor:in) / LIU JINYANG (Autor:in)
30.04.2021
Patent
Elektronische Ressource
Chinesisch
IPC:
E02B
HYDRAULIC ENGINEERING
,
Wasserbau
| Tema Archiv | 1988
Concreting steep spillway chute
Engineering Index Backfile | 1967
Model Study of Stepped Spillway in Supercritical Spillway Chute
| British Library Conference Proceedings | 2008
Rock erosion of unlined spillway chute
| British Library Conference Proceedings | 1997