Prediction and Evaluation of Waterjet Pump Performance under Nonuniform Inflow Using Parallel Compressor Theory
Parallel compressor theory (PCT) is commonly used to estimate effects of inlet distortion on compressor performance. As well as compressor, the actual inflow to pump is also nonuniform and unfavorable for performances. Nowadays, insufficient understanding of nonuniform inflow effects on pump perform...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-01-01
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| Series: | Water |
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| Online Access: | https://www.mdpi.com/2073-4441/13/1/99 |
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| author | Puyu Cao Rui Zhu |
| author_facet | Puyu Cao Rui Zhu |
| author_sort | Puyu Cao |
| collection | DOAJ |
| description | Parallel compressor theory (PCT) is commonly used to estimate effects of inlet distortion on compressor performance. As well as compressor, the actual inflow to pump is also nonuniform and unfavorable for performances. Nowadays, insufficient understanding of nonuniform inflow effects on pump performance restricts its development. Therefore, this paper applies PCT to predict external characteristics and evaluate internal flow instability of waterjet pump under nonuniform inflow. According to features of nonuniform inflow, the traditional PCT is modified and makes waterjet pump sub-divided into two circumferential tubes owning same performances but with different inlet velocity (representing nonuniform inflow). Above all, numerical simulation has been conducted to validated the applicability and accuracy of PCT in head prediction of waterjet pump under nonuniform inflow, since area-weighted sum of each tube head (i.e., theoretical pump head) is highly consistent with simulated result. Moreover, based on identifications of when and which tube occurs stall, PCT evaluates four stall behaviors of waterjet pump: partial deep stall, partial stall, pre-stall and full stall. Furthermore, different stall behavior generates different interactions between head variation of each tube, resulting in a multi-segment head curve under nonuniform inflow. The modified PCT with associated physical interpretations are expected to provide a sufficient understanding of nonuniform inflow effects on pump performances. |
| first_indexed | 2024-03-10T13:29:48Z |
| format | Article |
| id | doaj.art-3648be5c24b44093b58408c6ebcf364a |
| institution | Directory Open Access Journal |
| issn | 2073-4441 |
| language | English |
| last_indexed | 2024-03-10T13:29:48Z |
| publishDate | 2021-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Water |
| spelling | doaj.art-3648be5c24b44093b58408c6ebcf364a2023-11-21T08:09:21ZengMDPI AGWater2073-44412021-01-011319910.3390/w13010099Prediction and Evaluation of Waterjet Pump Performance under Nonuniform Inflow Using Parallel Compressor TheoryPuyu Cao0Rui Zhu1National Research Center of Pumps, Jiangsu University, Zhenjiang 212013, ChinaSchool of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 71049, ChinaParallel compressor theory (PCT) is commonly used to estimate effects of inlet distortion on compressor performance. As well as compressor, the actual inflow to pump is also nonuniform and unfavorable for performances. Nowadays, insufficient understanding of nonuniform inflow effects on pump performance restricts its development. Therefore, this paper applies PCT to predict external characteristics and evaluate internal flow instability of waterjet pump under nonuniform inflow. According to features of nonuniform inflow, the traditional PCT is modified and makes waterjet pump sub-divided into two circumferential tubes owning same performances but with different inlet velocity (representing nonuniform inflow). Above all, numerical simulation has been conducted to validated the applicability and accuracy of PCT in head prediction of waterjet pump under nonuniform inflow, since area-weighted sum of each tube head (i.e., theoretical pump head) is highly consistent with simulated result. Moreover, based on identifications of when and which tube occurs stall, PCT evaluates four stall behaviors of waterjet pump: partial deep stall, partial stall, pre-stall and full stall. Furthermore, different stall behavior generates different interactions between head variation of each tube, resulting in a multi-segment head curve under nonuniform inflow. The modified PCT with associated physical interpretations are expected to provide a sufficient understanding of nonuniform inflow effects on pump performances.https://www.mdpi.com/2073-4441/13/1/99waterjet pumpnonuniform inflowparallel compressor theorystallhead |
| spellingShingle | Puyu Cao Rui Zhu Prediction and Evaluation of Waterjet Pump Performance under Nonuniform Inflow Using Parallel Compressor Theory Water waterjet pump nonuniform inflow parallel compressor theory stall head |
| title | Prediction and Evaluation of Waterjet Pump Performance under Nonuniform Inflow Using Parallel Compressor Theory |
| title_full | Prediction and Evaluation of Waterjet Pump Performance under Nonuniform Inflow Using Parallel Compressor Theory |
| title_fullStr | Prediction and Evaluation of Waterjet Pump Performance under Nonuniform Inflow Using Parallel Compressor Theory |
| title_full_unstemmed | Prediction and Evaluation of Waterjet Pump Performance under Nonuniform Inflow Using Parallel Compressor Theory |
| title_short | Prediction and Evaluation of Waterjet Pump Performance under Nonuniform Inflow Using Parallel Compressor Theory |
| title_sort | prediction and evaluation of waterjet pump performance under nonuniform inflow using parallel compressor theory |
| topic | waterjet pump nonuniform inflow parallel compressor theory stall head |
| url | https://www.mdpi.com/2073-4441/13/1/99 |
| work_keys_str_mv | AT puyucao predictionandevaluationofwaterjetpumpperformanceundernonuniforminflowusingparallelcompressortheory AT ruizhu predictionandevaluationofwaterjetpumpperformanceundernonuniforminflowusingparallelcompressortheory |