Investigation into the Influence of Division Pier on the Internal Flow and Pulsation in the Outlet Conduit of an Axial-Flow Pump
The outlet conduit is an important construction connecting the outlet of the pump guide vane and the outlet pool; in order to study the hydraulic performance of the straight outlet conduit of the axial-flow pump device, this paper adopts the method of numerical simulation and analyzes the influence...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-07-01
|
| Series: | Applied Sciences |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2076-3417/11/15/6774 |
| _version_ | 1827686714645151744 |
|---|---|
| author | Fan Yang Dongjin Jiang Tieli Wang Pengcheng Chang Chao Liu Dongsheng Liu |
| author_facet | Fan Yang Dongjin Jiang Tieli Wang Pengcheng Chang Chao Liu Dongsheng Liu |
| author_sort | Fan Yang |
| collection | DOAJ |
| description | The outlet conduit is an important construction connecting the outlet of the pump guide vane and the outlet pool; in order to study the hydraulic performance of the straight outlet conduit of the axial-flow pump device, this paper adopts the method of numerical simulation and analyzes the influence of the division pier on the pressure and velocity distribution inside and near the wall of the straight outlet conduit based on three design schemes. Four pressure pulsation measuring points were arranged in the straight outlet conduit, and the low-frequency pulsation characteristic information inside the straight outlet conduit with and without the division pier was extracted by wavelet packet reconstruction. The results show that the addition of a division pier has an effect on the hydraulic loss, near-wall pressure and velocity distribution in the straight outlet conduit. A small high-pressure zone is formed near the wall at the starting position of the division pier, and a large high-speed zone is formed on the left side at the starting position of the division pier. The length of the division pier has no significant effect on the flow distribution of the straight outlet conduit and the pressure and velocity distribution near the wall. Under different working conditions, each monitoring point has the maximum energy in the sub-band (0~31.25 Hz). With the increase of the flow rate, the total pressure energy of the straight outlet conduit decreases gradually. Under each condition, the difference of the energy proportion of the horizontal monitoring points of the straight outlet conduit is small, and the difference of the energy proportion of the two monitoring points at the top and bottom of the outlet channel is relatively large. The energy of the two monitoring points in the straight outlet conduit with a division pier is smaller than that of the two monitoring points in the straight outlet conduit without a division pier. There are differences in the main frequency and the power spectrum corresponding to the main frequency of the monitoring points in the straight outlet conduit, and the reasonable setting of the division pier is conducive to reducing the pressure pulsation of the flow in the straight outlet conduit and is beneficial to the safe and stable operation of the pump device. |
| first_indexed | 2024-03-10T09:19:42Z |
| format | Article |
| id | doaj.art-50eb4b729632495db3c379074edfdaff |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T09:19:42Z |
| publishDate | 2021-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-50eb4b729632495db3c379074edfdaff2023-11-22T05:19:22ZengMDPI AGApplied Sciences2076-34172021-07-011115677410.3390/app11156774Investigation into the Influence of Division Pier on the Internal Flow and Pulsation in the Outlet Conduit of an Axial-Flow PumpFan Yang0Dongjin Jiang1Tieli Wang2Pengcheng Chang3Chao Liu4Dongsheng Liu5College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225009, ChinaCollege of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225009, ChinaJiangsu Surveying and Design Institute of Water Resources Co., Ltd., Yangzhou 225127, ChinaCollege of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225009, ChinaCollege of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225009, ChinaNanjing Hydraulic Research Institute, Nanjing 210029, ChinaThe outlet conduit is an important construction connecting the outlet of the pump guide vane and the outlet pool; in order to study the hydraulic performance of the straight outlet conduit of the axial-flow pump device, this paper adopts the method of numerical simulation and analyzes the influence of the division pier on the pressure and velocity distribution inside and near the wall of the straight outlet conduit based on three design schemes. Four pressure pulsation measuring points were arranged in the straight outlet conduit, and the low-frequency pulsation characteristic information inside the straight outlet conduit with and without the division pier was extracted by wavelet packet reconstruction. The results show that the addition of a division pier has an effect on the hydraulic loss, near-wall pressure and velocity distribution in the straight outlet conduit. A small high-pressure zone is formed near the wall at the starting position of the division pier, and a large high-speed zone is formed on the left side at the starting position of the division pier. The length of the division pier has no significant effect on the flow distribution of the straight outlet conduit and the pressure and velocity distribution near the wall. Under different working conditions, each monitoring point has the maximum energy in the sub-band (0~31.25 Hz). With the increase of the flow rate, the total pressure energy of the straight outlet conduit decreases gradually. Under each condition, the difference of the energy proportion of the horizontal monitoring points of the straight outlet conduit is small, and the difference of the energy proportion of the two monitoring points at the top and bottom of the outlet channel is relatively large. The energy of the two monitoring points in the straight outlet conduit with a division pier is smaller than that of the two monitoring points in the straight outlet conduit without a division pier. There are differences in the main frequency and the power spectrum corresponding to the main frequency of the monitoring points in the straight outlet conduit, and the reasonable setting of the division pier is conducive to reducing the pressure pulsation of the flow in the straight outlet conduit and is beneficial to the safe and stable operation of the pump device.https://www.mdpi.com/2076-3417/11/15/6774axial-flow pump devicestraight outlet conduitdivision piernumerical calculationmodel testpressure pulsation |
| spellingShingle | Fan Yang Dongjin Jiang Tieli Wang Pengcheng Chang Chao Liu Dongsheng Liu Investigation into the Influence of Division Pier on the Internal Flow and Pulsation in the Outlet Conduit of an Axial-Flow Pump Applied Sciences axial-flow pump device straight outlet conduit division pier numerical calculation model test pressure pulsation |
| title | Investigation into the Influence of Division Pier on the Internal Flow and Pulsation in the Outlet Conduit of an Axial-Flow Pump |
| title_full | Investigation into the Influence of Division Pier on the Internal Flow and Pulsation in the Outlet Conduit of an Axial-Flow Pump |
| title_fullStr | Investigation into the Influence of Division Pier on the Internal Flow and Pulsation in the Outlet Conduit of an Axial-Flow Pump |
| title_full_unstemmed | Investigation into the Influence of Division Pier on the Internal Flow and Pulsation in the Outlet Conduit of an Axial-Flow Pump |
| title_short | Investigation into the Influence of Division Pier on the Internal Flow and Pulsation in the Outlet Conduit of an Axial-Flow Pump |
| title_sort | investigation into the influence of division pier on the internal flow and pulsation in the outlet conduit of an axial flow pump |
| topic | axial-flow pump device straight outlet conduit division pier numerical calculation model test pressure pulsation |
| url | https://www.mdpi.com/2076-3417/11/15/6774 |
| work_keys_str_mv | AT fanyang investigationintotheinfluenceofdivisionpierontheinternalflowandpulsationintheoutletconduitofanaxialflowpump AT dongjinjiang investigationintotheinfluenceofdivisionpierontheinternalflowandpulsationintheoutletconduitofanaxialflowpump AT tieliwang investigationintotheinfluenceofdivisionpierontheinternalflowandpulsationintheoutletconduitofanaxialflowpump AT pengchengchang investigationintotheinfluenceofdivisionpierontheinternalflowandpulsationintheoutletconduitofanaxialflowpump AT chaoliu investigationintotheinfluenceofdivisionpierontheinternalflowandpulsationintheoutletconduitofanaxialflowpump AT dongshengliu investigationintotheinfluenceofdivisionpierontheinternalflowandpulsationintheoutletconduitofanaxialflowpump |