自由流动条件下斜坡坡度对驼峰堰效率的影响

IF 1.1 4区工程技术 Q3 ENGINEERING, CIVIL

Canadian Journal of Civil Engineering Pub Date : 2023-03-23 DOI:10.1139/cjce-2022-0353

A. Azimi, A. Ahmadi, A. Baki

{"title":"自由流动条件下斜坡坡度对驼峰堰效率的影响","authors":"A. Azimi, A. Ahmadi, A. Baki","doi":"10.1139/cjce-2022-0353","DOIUrl":null,"url":null,"abstract":"A series of numerical simulations was performed to study the discharge capacity of symmetrical hump weirs. A wide range of ramp slopes was selected from 1V:1H to 1V:5H and the effects of discharge and ramp slope on variations of discharge coefficient were investigated. The proposed models for prediction of discharge characteristics of triangular weirs with an upstream or/and downstream ramp(s) were compared with the discharge capacity of sharp-crested weirs to study the effects of ramp slope. It was found that the available head-discharge models for asymmetric hump weirs are not suitable for prediction of discharge in symmetrical hump weirs, and new prediction models are required. The performance of symmetrical hump weirs increased with increasing headwater and reached an optimum operating condition. After the optimum flow condition, the discharge coefficient decreased due to flow separation and suppression of the downstream eddies indicating that the weir is not economic in this regime.","PeriodicalId":9414,"journal":{"name":"Canadian Journal of Civil Engineering","volume":"1 1","pages":""},"PeriodicalIF":1.1000,"publicationDate":"2023-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effect of ramp slope on the efficiency of hump weirs in free flow condition\",\"authors\":\"A. Azimi, A. Ahmadi, A. Baki\",\"doi\":\"10.1139/cjce-2022-0353\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"A series of numerical simulations was performed to study the discharge capacity of symmetrical hump weirs. A wide range of ramp slopes was selected from 1V:1H to 1V:5H and the effects of discharge and ramp slope on variations of discharge coefficient were investigated. The proposed models for prediction of discharge characteristics of triangular weirs with an upstream or/and downstream ramp(s) were compared with the discharge capacity of sharp-crested weirs to study the effects of ramp slope. It was found that the available head-discharge models for asymmetric hump weirs are not suitable for prediction of discharge in symmetrical hump weirs, and new prediction models are required. The performance of symmetrical hump weirs increased with increasing headwater and reached an optimum operating condition. After the optimum flow condition, the discharge coefficient decreased due to flow separation and suppression of the downstream eddies indicating that the weir is not economic in this regime.\",\"PeriodicalId\":9414,\"journal\":{\"name\":\"Canadian Journal of Civil Engineering\",\"volume\":\"1 1\",\"pages\":\"\"},\"PeriodicalIF\":1.1000,\"publicationDate\":\"2023-03-23\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Canadian Journal of Civil Engineering\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://doi.org/10.1139/cjce-2022-0353\",\"RegionNum\":4,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"ENGINEERING, CIVIL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Canadian Journal of Civil Engineering","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1139/cjce-2022-0353","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, CIVIL","Score":null,"Total":0}

引用次数: 0

摘要

对对称驼峰堰的泄流能力进行了一系列数值模拟研究。选取1V:1H ~ 1V:5H范围内的坡道坡度，研究了流量和坡道坡度对流量系数变化的影响。将所建立的三角堰上下游坡道流量特性预测模型与尖顶堰的流量特性进行比较，研究坡道坡度对三角堰流量特性的影响。发现现有的非对称驼峰河头流量模型不适用于对称驼峰河头流量的预测，需要建立新的预测模型。对称驼峰堰的性能随水源的增加而增加，并达到最佳运行状态。在最佳流量工况后，由于水流分离和下游涡流的抑制，流量系数减小，表明该工况下堰不经济。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

查看原文本刊更多论文

Effect of ramp slope on the efficiency of hump weirs in free flow condition

A series of numerical simulations was performed to study the discharge capacity of symmetrical hump weirs. A wide range of ramp slopes was selected from 1V:1H to 1V:5H and the effects of discharge and ramp slope on variations of discharge coefficient were investigated. The proposed models for prediction of discharge characteristics of triangular weirs with an upstream or/and downstream ramp(s) were compared with the discharge capacity of sharp-crested weirs to study the effects of ramp slope. It was found that the available head-discharge models for asymmetric hump weirs are not suitable for prediction of discharge in symmetrical hump weirs, and new prediction models are required. The performance of symmetrical hump weirs increased with increasing headwater and reached an optimum operating condition. After the optimum flow condition, the discharge coefficient decreased due to flow separation and suppression of the downstream eddies indicating that the weir is not economic in this regime.

求助全文

通过发布文献求助，成功后即可免费获取论文全文。去求助

来源期刊

Canadian Journal of Civil Engineering 工程技术-工程：土木

CiteScore

3.00

自引率

7.10%

发文量

105

审稿时长

14 months

期刊介绍： The Canadian Journal of Civil Engineering is the official journal of the Canadian Society for Civil Engineering. It contains articles on environmental engineering, hydrotechnical engineering, structural engineering, construction engineering, engineering mechanics, engineering materials, and history of civil engineering. Contributors include recognized researchers and practitioners in industry, government, and academia. New developments in engineering design and construction are also featured.