Energy dissipation characteristics of an in-chamber longitudinal culvert system with three-layer side ports designed for a large-scale lock with 60m water head

IF 0.7 Q3 ENGINEERING, MULTIDISCIPLINARY

Engineering Review Pub Date : 2023-01-01 DOI:10.30765/er.2051

Ming Chen, Xu-shen Zhou, Rengmin Li, Xueyi Li

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Abstract

With the rapid development of the water transportation industry in China, the scale of ships navigating in the inland waterway is increasing. However, the water head formed by dams is very high, especially for the hydroelectric projects constructed in the upper mountain river. Therefore, it is critically urgent to build several high-head and large-scale locks. Moreover, when the water head is increased to 60 m, huge water energy could be generated and then introduced into the corresponding lock chamber if the valve operating time is limited. This paper presented the in-chamber longitudinal culvert system with three-layer side ports to efficiently dissipate the water energy to ensure safe mooring conditions for ships during a lock operation. A three-dimensional CFD model for 1/4 local region of the corresponding chamber was developed to predict its hydraulic behavior. The numerical simulations were conducted to examine the effect of the vertical spacing between side ports on the energy dissipation result. Results showed that good energy dissipation performance was gained when the relative vertical spacing was set B/D=0.25 (B is the vertical spacing between side ports, D is the inner height of the culvert). Furthermore, the energy dissipation mechanism of this arrangement was presented based on the results of a three-dimensional hydraulic characteristic. In addition, the corresponding dissipation result of the present arrangement was compared with those of the single-layer and two-layer side ports. The dissipation performance of the present design was found to be the best if all the side ports’ cross-section area of each arrangement keeps the same.

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大型水头60m船闸三层侧孔纵向涵洞系统消能特性

随着中国水运事业的快速发展，在内河航道航行的船舶规模日益增大。然而，大坝形成的水头非常高，特别是在上游山区河流上建设的水电工程。因此，建设几座高水头大型水闸刻不容缓。此外，当水头增加到60 m时，如果限制阀门的运行时间，可以产生巨大的水能，然后将水能引入相应的锁室。本文提出了一种带三层侧孔的舱内纵涵洞系统，该系统能有效地耗散水能，保证船舶在船闸运行时的安全系泊条件。建立了相应腔室1/4局部区域的三维CFD模型，对其水力特性进行了预测。通过数值模拟研究了侧孔垂直间距对消能效果的影响。结果表明:当相对垂向间距B/D=0.25 (B为侧孔垂向间距，D为涵洞内高)时，能获得较好的消能性能;在此基础上，通过三维水力特性分析，分析了这种布置的耗能机理。此外，还将这种布置方式与单层和双层侧孔布置方式的耗散结果进行了比较。结果表明，当各布置的侧孔截面面积相同时，本设计的散热性能最佳。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Engineering Review ENGINEERING, MULTIDISCIPLINARY-

CiteScore

1.00

自引率

0.00%

发文量

期刊介绍： Engineering Review is an international journal designed to foster the exchange of ideas and transfer of knowledge between scientists and engineers involved in various engineering sciences that deal with investigations related to design, materials, technology, maintenance and manufacturing processes. It is not limited to the specific details of science and engineering but is instead devoted to a very wide range of subfields in the engineering sciences. It provides an appropriate resort for publishing the papers covering prior applications – based on the research topics comprising the entire engineering spectrum. Topics of particular interest thus include: mechanical engineering, naval architecture and marine engineering, fundamental engineering sciences, electrical engineering, computer sciences and civil engineering. Manuscripts addressing other issues may also be considered if they relate to engineering oriented subjects. The contributions, which may be analytical, numerical or experimental, should be of significance to the progress of mentioned topics. Papers that are merely illustrations of established principles or procedures generally will not be accepted. Occasionally, the magazine is ready to publish high-quality-selected papers from the conference after being renovated, expanded and written in accordance with the rules of the magazine. The high standard of excellence for any of published papers will be ensured by peer-review procedure. The journal takes into consideration only original scientific papers.