Analysis of Energy Loss Characteristics of Vertical Axial Flow Pump Based on Entropy Production Method under Partial Conditions
The energy loss of the vertical axial flow pump device increases due to the unstable internal flow, which reduces the efficiency of the pump device and increases its energy consumption of the pump device. The research results of the flow loss characteristics of the total internal conduit are still u...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-08-01
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| Series: | Entropy |
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| Online Access: | https://www.mdpi.com/1099-4300/24/9/1200 |
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| author | Fan Yang Pengcheng Chang Yiping Cai Zhikang Lin Fangping Tang Yuting Lv |
| author_facet | Fan Yang Pengcheng Chang Yiping Cai Zhikang Lin Fangping Tang Yuting Lv |
| author_sort | Fan Yang |
| collection | DOAJ |
| description | The energy loss of the vertical axial flow pump device increases due to the unstable internal flow, which reduces the efficiency of the pump device and increases its energy consumption of the pump device. The research results of the flow loss characteristics of the total internal conduit are still unclear. Therefore, to show the internal energy loss mechanism of the axial flow pump, this paper used the entropy production method to calculate the energy loss of the total conduit of the pump device to clarify the internal energy loss mechanism of the pump device. The results show that the energy loss of the impeller is the largest under various flow conditions, accounting for more than 40% of the total energy loss of the pump device. The variation trend of the volume average entropy production and the energy loss is similar under various flow coefficients (<i>K</i><sub>Q</sub>). The volume average entropy production rate (EPR) and the energy loss decrease first and then increase with the increase of flow, the minimum volume average entropy production is 378,000 W/m<sup>3</sup> at <i>K</i><sub>Q</sub> = 0.52, and the area average EPR of the impeller increases gradually with the increase of flow. Under various flow coefficient <i>K</i><sub>Q</sub>, the energy loss of campaniform inlet conduit is the smallest, accounting for less than 1% of the total energy loss. Its maximum value is 63.58 W. The energy loss of the guide vane and elbow increases with the increase of flow coefficient <i>K</i><sub>Q</sub>, and the maximum ratio of energy loss to the total energy loss of the pump device is 29% and 21%, respectively, at small flow condition <i>K</i><sub>Q</sub> = 0.38. The energy loss of straight outlet conduit reduces first and then increases with the increase of flow coefficient <i>K</i><sub>Q</sub>. When flow coefficient <i>K</i><sub>Q</sub> = 0.62, it accounts for 27% of the total energy loss of the pump device, but its area average entropy production rate (EPR) and volume average entropy production rate (EPR) are small. The main entropy production loss in the pump device is dominated by entropy production by turbulent dissipation (EPTD), and the proportion of entropy production by direct dissipation (EPDD) is the smallest. |
| first_indexed | 2024-03-10T00:06:36Z |
| format | Article |
| id | doaj.art-bd79d2c9653f42cea04e75b7480e3288 |
| institution | Directory Open Access Journal |
| issn | 1099-4300 |
| language | English |
| last_indexed | 2024-03-10T00:06:36Z |
| publishDate | 2022-08-01 |
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| series | Entropy |
| spelling | doaj.art-bd79d2c9653f42cea04e75b7480e32882023-11-23T16:07:39ZengMDPI AGEntropy1099-43002022-08-01249120010.3390/e24091200Analysis of Energy Loss Characteristics of Vertical Axial Flow Pump Based on Entropy Production Method under Partial ConditionsFan Yang0Pengcheng Chang1Yiping Cai2Zhikang Lin3Fangping Tang4Yuting Lv5College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225009, ChinaCollege of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225009, ChinaWater Resources Research Institute of Jiangsu Province, Nanjing 210017, ChinaCollege of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225009, ChinaCollege of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225009, ChinaCollege of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225009, ChinaThe energy loss of the vertical axial flow pump device increases due to the unstable internal flow, which reduces the efficiency of the pump device and increases its energy consumption of the pump device. The research results of the flow loss characteristics of the total internal conduit are still unclear. Therefore, to show the internal energy loss mechanism of the axial flow pump, this paper used the entropy production method to calculate the energy loss of the total conduit of the pump device to clarify the internal energy loss mechanism of the pump device. The results show that the energy loss of the impeller is the largest under various flow conditions, accounting for more than 40% of the total energy loss of the pump device. The variation trend of the volume average entropy production and the energy loss is similar under various flow coefficients (<i>K</i><sub>Q</sub>). The volume average entropy production rate (EPR) and the energy loss decrease first and then increase with the increase of flow, the minimum volume average entropy production is 378,000 W/m<sup>3</sup> at <i>K</i><sub>Q</sub> = 0.52, and the area average EPR of the impeller increases gradually with the increase of flow. Under various flow coefficient <i>K</i><sub>Q</sub>, the energy loss of campaniform inlet conduit is the smallest, accounting for less than 1% of the total energy loss. Its maximum value is 63.58 W. The energy loss of the guide vane and elbow increases with the increase of flow coefficient <i>K</i><sub>Q</sub>, and the maximum ratio of energy loss to the total energy loss of the pump device is 29% and 21%, respectively, at small flow condition <i>K</i><sub>Q</sub> = 0.38. The energy loss of straight outlet conduit reduces first and then increases with the increase of flow coefficient <i>K</i><sub>Q</sub>. When flow coefficient <i>K</i><sub>Q</sub> = 0.62, it accounts for 27% of the total energy loss of the pump device, but its area average entropy production rate (EPR) and volume average entropy production rate (EPR) are small. The main entropy production loss in the pump device is dominated by entropy production by turbulent dissipation (EPTD), and the proportion of entropy production by direct dissipation (EPDD) is the smallest.https://www.mdpi.com/1099-4300/24/9/1200pump deviceaxial flow pumpconduitenergy lossentropy production methodnumerical analysis |
| spellingShingle | Fan Yang Pengcheng Chang Yiping Cai Zhikang Lin Fangping Tang Yuting Lv Analysis of Energy Loss Characteristics of Vertical Axial Flow Pump Based on Entropy Production Method under Partial Conditions Entropy pump device axial flow pump conduit energy loss entropy production method numerical analysis |
| title | Analysis of Energy Loss Characteristics of Vertical Axial Flow Pump Based on Entropy Production Method under Partial Conditions |
| title_full | Analysis of Energy Loss Characteristics of Vertical Axial Flow Pump Based on Entropy Production Method under Partial Conditions |
| title_fullStr | Analysis of Energy Loss Characteristics of Vertical Axial Flow Pump Based on Entropy Production Method under Partial Conditions |
| title_full_unstemmed | Analysis of Energy Loss Characteristics of Vertical Axial Flow Pump Based on Entropy Production Method under Partial Conditions |
| title_short | Analysis of Energy Loss Characteristics of Vertical Axial Flow Pump Based on Entropy Production Method under Partial Conditions |
| title_sort | analysis of energy loss characteristics of vertical axial flow pump based on entropy production method under partial conditions |
| topic | pump device axial flow pump conduit energy loss entropy production method numerical analysis |
| url | https://www.mdpi.com/1099-4300/24/9/1200 |
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