超低比转速离心泵关阀启动瞬态特性分析
为探究超低比转速离心泵关阀启动瞬态特性,该文以一台比转速为25的超低比转速离心泵为研究对象,在关死点工况下对稳态和关阀启动瞬态过程进行数值模拟,并与试验结果进行对比,研究表明：在关死点稳态工况下性能曲线与试验测得结果变化趋势相同,最大偏差小于5%,验证了数值模拟的准确性;关阀启动过程,不同启动加速度下启动过程的末期均出现一个冲击扬程;在相同转速时,稳态过程中间截面的静压分布、相对速度流线分布和进口管路内相对速度与关阀启动瞬态过程分布趋势存在差异。关阀启动瞬态过程内部流场的发展总体上滞后于关死点稳态过程内部流场。研究结果可为进一步研究超低比转速离心泵启动的瞬态过程特性提供参考。...
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| Published in | 农业工程学报 Vol. 33; no. 11; pp. 68 - 74 |
|---|---|
| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
江苏大学国家水泵及系统工程技术研究中心,镇江,212013%西华大学流体及动力机械教育部重点实验室,成都,610039
2017
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1002-6819 |
| DOI | 10.11975/j.issn.1002-6819.2017.11.009 |
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| Abstract | 为探究超低比转速离心泵关阀启动瞬态特性,该文以一台比转速为25的超低比转速离心泵为研究对象,在关死点工况下对稳态和关阀启动瞬态过程进行数值模拟,并与试验结果进行对比,研究表明：在关死点稳态工况下性能曲线与试验测得结果变化趋势相同,最大偏差小于5%,验证了数值模拟的准确性;关阀启动过程,不同启动加速度下启动过程的末期均出现一个冲击扬程;在相同转速时,稳态过程中间截面的静压分布、相对速度流线分布和进口管路内相对速度与关阀启动瞬态过程分布趋势存在差异。关阀启动瞬态过程内部流场的发展总体上滞后于关死点稳态过程内部流场。研究结果可为进一步研究超低比转速离心泵启动的瞬态过程特性提供参考。 |
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| AbstractList | TH311; 为探究超低比转速离心泵关阀启动瞬态特性,该文以一台比转速为25的超低比转速离心泵为研究对象,在关死点工况下对稳态和关阀启动瞬态过程进行数值模拟,并与试验结果进行对比,研究表明:在关死点稳态工况下性能曲线与试验测得结果变化趋势相同,最大偏差小于5%,验证了数值模拟的准确性;关阀启动过程,不同启动加速度下启动过程的末期均出现一个冲击扬程;在相同转速时,稳态过程中间截面的静压分布、相对速度流线分布和进口管路内相对速度与关阀启动瞬态过程分布趋势存在差异.关阀启动瞬态过程内部流场的发展总体上滞后于关死点稳态过程内部流场.研究结果可为进一步研究超低比转速离心泵启动的瞬态过程特性提供参考. 为探究超低比转速离心泵关阀启动瞬态特性,该文以一台比转速为25的超低比转速离心泵为研究对象,在关死点工况下对稳态和关阀启动瞬态过程进行数值模拟,并与试验结果进行对比,研究表明：在关死点稳态工况下性能曲线与试验测得结果变化趋势相同,最大偏差小于5%,验证了数值模拟的准确性;关阀启动过程,不同启动加速度下启动过程的末期均出现一个冲击扬程;在相同转速时,稳态过程中间截面的静压分布、相对速度流线分布和进口管路内相对速度与关阀启动瞬态过程分布趋势存在差异。关阀启动瞬态过程内部流场的发展总体上滞后于关死点稳态过程内部流场。研究结果可为进一步研究超低比转速离心泵启动的瞬态过程特性提供参考。 |
| Abstract_FL | In order to explore the characteristics of the ultra-low specific-speed centrifugal pump during startup period under shut-off condition, an ultra-low specific-speed centrifugal pump with the specific-speed of 25 was chosen as the research object. Unsteady numerical calculation under shut-off condition and transient condition was conducted for the ultra-low specific-speed centrifugal pump. The accuracy of numerical simulation was verified by experimental contrast. Based on the numerical results, the influence of different starting acceleration on the transient impact head, the difference between steady state and transient impact head, and the internal flow field were analyzed. The results showed that: The variation tendency of performance curve on shut-off condition under steady state condition was similar with the experiment, and along with the increase of rotational speed, the head under shut-off condition increased gradually. When the start was completed, the transient head was 8.32%, 6.13% and 4.19% higher than the steady state head, respectively, at 3 different starting accelerations, which indicated that the valve head change during the startup process had a significant transient effect. There was a significantly higher impact head at the end of startup processes with 3 different start accelerations, and with the increase of start acceleration, the impact head was also increased. With the rotation of the impeller acting fluid, the static pressure increased gradually with the increase of the radius. In addition to the impeller flow close to the tongue, the pressure distribution in the other channels was uniform, and the pressure gradient of the tongue was larger, which indicated that the volute tongue structure had an important influence on the distribution of the static pressure in the pump. With the increase of rotation speed, the static pressure increased gradually, and the pressure difference between the inlet and outlet of the pump increased gradually. When the time was 0.4 s, a high pressure concentration area occurred at impeller outlet near the blade pressure surface, and along with the increase of rotation speed, the high pressure concentration area gradually disappeared. The pump pressure distribution gradually grew uniform with pump pressure increasing. At the same speed, static pressure distribution, absolute speed streamline, and relative speed streamline shaft section of inlet pipe during stable process were different from the distribution during transient startup process. The differences were narrow with the increase of rotational speed. At the same speed, the development of inside transient flow field during transient startup process generally lagged after stable condition. At the same speed, static pressure of steady state and startup period under shut-off condition was obviously different. At the beginning of startup period, the static pressure distribution difference was the maximum, and with the increase of speed, the static pressure distribution difference gradually decreased. The relative velocity of steady state and startup period under shut-off condition was obviously different. At the beginning of the startup process, the difference of the streamline distribution of relative velocity was the biggest; with the increase of rotating speed, the difference of pump flow field decreased gradually. The relative velocity of inlet pipe in the process of steady state was larger than that in the process of startup, and the ranges of vortex region and vortex number were greater than the transient process at the same time. Based on the above results, it was found that with the decrease of starting acceleration, the transient effect was weakened. The research results provide the reference for the further study of the characteristics of transient process of the ultra-low specific-speed centrifugal pump. |
| Author | 王勇 陈杰 刘厚林 邵昌 张翔 |
| AuthorAffiliation | 江苏大学国家水泵及系统工程技术研究中心,镇江212013 西华大学流体及动力机械教育部重点实验室,成都610039 |
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| Author_FL | Chen Jie Liu Houlin Wang Yong Shao Chang Zhang Xiang |
| Author_FL_xml | – sequence: 1 fullname: Wang Yong – sequence: 2 fullname: Chen Jie – sequence: 3 fullname: Liu Houlin – sequence: 4 fullname: Shao Chang – sequence: 5 fullname: Zhang Xiang |
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| DocumentTitleAlternate | Transient characteristic analysis of ultra-low specific-speed centrifugal pumps during startup period under shut-off condition |
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| Keywords | 关死点工况 steady characteristic centrifugal pump experiment 试验 离心泵 computer simulation shut-off condition transient characteristic 计算机仿真 稳态特性 瞬态特性 |
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| Notes | 11-2047/S In order to explore the characteristics of the ultra-low specific-speed centrifugal pump during startup period under shut-off condition,an ultra-low specific-speed centrifugal pump with the specific-speed of 25 was chosen as the research object.Unsteady numerical calculation under shut-off condition and transient condition was conducted for the ultra-low specific-speed centrifugal pump.The accuracy of numerical simulation was verified by experimental contrast.Based on the numerical results,the influence of different starting acceleration on the transient impact head,the difference between steady state and transient impact head,and the internal flow field were analyzed.The results showed that：The variation tendency of performance curve on shut-off condition under steady state condition was similar with the experiment,and along with the increase of rotational speed,the head under shut-off condition increased gradually.When the start was completed,the transient head was 8.32%,6.13% and 4.19% higher than |
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| PublicationTitle | 农业工程学报 |
| PublicationTitleAlternate | Transactions of the Chinese Society of Agricultural Engineering |
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| PublicationYear | 2017 |
| Publisher | 江苏大学国家水泵及系统工程技术研究中心,镇江,212013%西华大学流体及动力机械教育部重点实验室,成都,610039 |
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| Snippet | 为探究超低比转速离心泵关阀启动瞬态特性,该文以一台比转速为25的超低比转速离心泵为研究对象,在关死点工况下对稳态和关阀启动瞬态过程进行数值模拟,并与试验结果进行对... TH311; 为探究超低比转速离心泵关阀启动瞬态特性,该文以一台比转速为25的超低比转速离心泵为研究对象,在关死点工况下对稳态和关阀启动瞬态过程进行数值模拟,并与试验结果... |
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| SubjectTerms | 关死点工况 瞬态特性 离心泵 稳态特性 计算机仿真 试验 |
| Title | 超低比转速离心泵关阀启动瞬态特性分析 |
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