Numerical Investigation on the Effect of Section Width on the Performance of Air Ejector with Rectangular Section
Due to its simple structure and lack of moving parts, the supersonic air ejector has been widely applied in the fields of machinery, aerospace, and energy-saving. The performance of the ejector is influenced by the flow channel structure and the velocity of the jet, thus the confined jet is an impor...
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MDPI AG
2023-01-01
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| Online Access: | https://www.mdpi.com/1099-4300/25/1/179 |
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| author | Ying Zhang Jingming Dong Shuaiyu Song Xinxiang Pan Nan He Manfei Lu |
| author_facet | Ying Zhang Jingming Dong Shuaiyu Song Xinxiang Pan Nan He Manfei Lu |
| author_sort | Ying Zhang |
| collection | DOAJ |
| description | Due to its simple structure and lack of moving parts, the supersonic air ejector has been widely applied in the fields of machinery, aerospace, and energy-saving. The performance of the ejector is influenced by the flow channel structure and the velocity of the jet, thus the confined jet is an important limiting factor for the performance of the supersonic air ejector. In order to investigate the effect of the confined jet on the performance of the ejector, an air ejector with a rectangular section was designed. The effects of the section width (<i>W<sub>c</sub></i>) on the entrainment ratio, velocity distribution, turbulent kinetic energy distribution, Mach number distribution, and vorticity distribution of the rectangular section air ejector were studied numerically. The numerical results indicated that the entrainment ratio of the rectangular section air ejector increased from 0.34 to 0.65 and the increment of the <i>ER</i> was 91.2% when the section width increased from 1 mm to 10 mm. As <i>W<sub>c</sub></i> increased, the region of the turbulent kinetic energy gradually expanded. The energy exchange between the primary fluid and the secondary fluid was mainly in the form of turbulent diffusion in the mixing chamber. In addition to <i>W<sub>c</sub></i> limiting the fluid flow in the rectangular section air ejector, the structure size of the rectangular section air ejector in the XOY plane also had a limiting effect on the internal fluid flow. In the rectangular section air ejector, the streamwise vortices played an important role in the mixing process. The increase of <i>W<sub>c</sub></i> would increase the distribution of the streamwise vortices in the constant-area section. Meanwhile, the distribution of the spanwise vortices would gradually decrease. |
| first_indexed | 2024-03-09T12:48:33Z |
| format | Article |
| id | doaj.art-f71b4e244f2040dd98274dd9e8b119d5 |
| institution | Directory Open Access Journal |
| issn | 1099-4300 |
| language | English |
| last_indexed | 2024-03-09T12:48:33Z |
| publishDate | 2023-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Entropy |
| spelling | doaj.art-f71b4e244f2040dd98274dd9e8b119d52023-11-30T22:09:51ZengMDPI AGEntropy1099-43002023-01-0125117910.3390/e25010179Numerical Investigation on the Effect of Section Width on the Performance of Air Ejector with Rectangular SectionYing Zhang0Jingming Dong1Shuaiyu Song2Xinxiang Pan3Nan He4Manfei Lu5Marine Engineering College, Dalian Maritime University, Dalian 116026, ChinaMarine Engineering College, Dalian Maritime University, Dalian 116026, ChinaMarine Engineering College, Dalian Maritime University, Dalian 116026, ChinaMarine Engineering College, Dalian Maritime University, Dalian 116026, ChinaMarine Engineering College, Dalian Maritime University, Dalian 116026, ChinaMarine Engineering College, Dalian Maritime University, Dalian 116026, ChinaDue to its simple structure and lack of moving parts, the supersonic air ejector has been widely applied in the fields of machinery, aerospace, and energy-saving. The performance of the ejector is influenced by the flow channel structure and the velocity of the jet, thus the confined jet is an important limiting factor for the performance of the supersonic air ejector. In order to investigate the effect of the confined jet on the performance of the ejector, an air ejector with a rectangular section was designed. The effects of the section width (<i>W<sub>c</sub></i>) on the entrainment ratio, velocity distribution, turbulent kinetic energy distribution, Mach number distribution, and vorticity distribution of the rectangular section air ejector were studied numerically. The numerical results indicated that the entrainment ratio of the rectangular section air ejector increased from 0.34 to 0.65 and the increment of the <i>ER</i> was 91.2% when the section width increased from 1 mm to 10 mm. As <i>W<sub>c</sub></i> increased, the region of the turbulent kinetic energy gradually expanded. The energy exchange between the primary fluid and the secondary fluid was mainly in the form of turbulent diffusion in the mixing chamber. In addition to <i>W<sub>c</sub></i> limiting the fluid flow in the rectangular section air ejector, the structure size of the rectangular section air ejector in the XOY plane also had a limiting effect on the internal fluid flow. In the rectangular section air ejector, the streamwise vortices played an important role in the mixing process. The increase of <i>W<sub>c</sub></i> would increase the distribution of the streamwise vortices in the constant-area section. Meanwhile, the distribution of the spanwise vortices would gradually decrease.https://www.mdpi.com/1099-4300/25/1/179air ejectorrectangular sectionturbulent kinetic energyshock trainvorticity |
| spellingShingle | Ying Zhang Jingming Dong Shuaiyu Song Xinxiang Pan Nan He Manfei Lu Numerical Investigation on the Effect of Section Width on the Performance of Air Ejector with Rectangular Section Entropy air ejector rectangular section turbulent kinetic energy shock train vorticity |
| title | Numerical Investigation on the Effect of Section Width on the Performance of Air Ejector with Rectangular Section |
| title_full | Numerical Investigation on the Effect of Section Width on the Performance of Air Ejector with Rectangular Section |
| title_fullStr | Numerical Investigation on the Effect of Section Width on the Performance of Air Ejector with Rectangular Section |
| title_full_unstemmed | Numerical Investigation on the Effect of Section Width on the Performance of Air Ejector with Rectangular Section |
| title_short | Numerical Investigation on the Effect of Section Width on the Performance of Air Ejector with Rectangular Section |
| title_sort | numerical investigation on the effect of section width on the performance of air ejector with rectangular section |
| topic | air ejector rectangular section turbulent kinetic energy shock train vorticity |
| url | https://www.mdpi.com/1099-4300/25/1/179 |
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