鱼类通过混流式水轮机转轮时受压强及剪切损伤的概率分析
TK733+.3; 鱼类在通过混流式水轮机流道时会遭遇最低压强及压强梯度引发的压强损伤以及剪切应力引发的剪切损伤.为了辨识混流式转轮中压强损伤和剪切损伤的主次关系,进而有针对性的开展混流式转轮的鱼类生态友好性能优化,该文基于计算流体动力学分析方法研究了不同水头条件下混流式转轮内超出压强以及剪切损伤阈值的体积分布规律,并获得了不同工况下混流式转轮内压强、压强梯度以及剪切应力引发鱼类受损的概率.结果表明:鱼类受压强及剪切损伤的概率与流量成正相关关系,对于该文分析的混流式转轮,鱼类受最低压强损伤的概率在最小水头的最大流量工况下达到最大值9.1％,剪切损伤及高压强梯度损伤的概率在额定工况下达到最大,分...
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| Published in | 农业工程学报 Vol. 35; no. 2; pp. 55 - 62 |
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| Main Authors | , , , |
| Format | Journal Article |
| Language | Chinese |
| Published |
西安理工大学水利水电学院,西安,710048
15.01.2019
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1002-6819 |
| DOI | 10.11975/j.issn.1002-6819.2019.02.008 |
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| Abstract | TK733+.3; 鱼类在通过混流式水轮机流道时会遭遇最低压强及压强梯度引发的压强损伤以及剪切应力引发的剪切损伤.为了辨识混流式转轮中压强损伤和剪切损伤的主次关系,进而有针对性的开展混流式转轮的鱼类生态友好性能优化,该文基于计算流体动力学分析方法研究了不同水头条件下混流式转轮内超出压强以及剪切损伤阈值的体积分布规律,并获得了不同工况下混流式转轮内压强、压强梯度以及剪切应力引发鱼类受损的概率.结果表明:鱼类受压强及剪切损伤的概率与流量成正相关关系,对于该文分析的混流式转轮,鱼类受最低压强损伤的概率在最小水头的最大流量工况下达到最大值9.1％,剪切损伤及高压强梯度损伤的概率在额定工况下达到最大,分别为0.823％和8.31％.在相同工况下进行3种损伤概率的对比后发现,在大流量工况下,鱼类受最低压强和高压强梯度损伤的概率更大,在小流量工况下则是压强梯度损伤概率相对较高,所以综合分析结果可知最低压强和高压强梯度是开展亲鱼型混流式转轮优化时需要考虑的主要因素,而剪切应变率则是次要因素. |
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| AbstractList | TK733+.3; 鱼类在通过混流式水轮机流道时会遭遇最低压强及压强梯度引发的压强损伤以及剪切应力引发的剪切损伤.为了辨识混流式转轮中压强损伤和剪切损伤的主次关系,进而有针对性的开展混流式转轮的鱼类生态友好性能优化,该文基于计算流体动力学分析方法研究了不同水头条件下混流式转轮内超出压强以及剪切损伤阈值的体积分布规律,并获得了不同工况下混流式转轮内压强、压强梯度以及剪切应力引发鱼类受损的概率.结果表明:鱼类受压强及剪切损伤的概率与流量成正相关关系,对于该文分析的混流式转轮,鱼类受最低压强损伤的概率在最小水头的最大流量工况下达到最大值9.1％,剪切损伤及高压强梯度损伤的概率在额定工况下达到最大,分别为0.823％和8.31％.在相同工况下进行3种损伤概率的对比后发现,在大流量工况下,鱼类受最低压强和高压强梯度损伤的概率更大,在小流量工况下则是压强梯度损伤概率相对较高,所以综合分析结果可知最低压强和高压强梯度是开展亲鱼型混流式转轮优化时需要考虑的主要因素,而剪切应变率则是次要因素. |
| Author | 朱国俊 吉龙娟 冯建军 罗兴锜 |
| AuthorAffiliation | 西安理工大学水利水电学院,西安,710048 |
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| Author_FL | Feng Jianjun Ji Longjuan Zhu Guojun Luo Xingqi |
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| Keywords | 流量 数值分析 剪切应力损伤 水轮机 鱼类损伤概率 鱼 混流式转轮 压强损伤 |
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| Title | 鱼类通过混流式水轮机转轮时受压强及剪切损伤的概率分析 |
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