Using Tip Injection to Stability Enhancement of a Transonic Centrifugal Impeller with Inlet Distortion
This paper aims to understand the effects of circumferential inlet distortion and tip injection on a transonic impeller performance and flow field. For distorted inflow, the impeller is subjected to a stationary 120-degrees circumferential total pressure distortion. Full annulus unsteady three-dimen...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Isfahan University of Technology
2022-09-01
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| Series: | Journal of Applied Fluid Mechanics |
| Subjects: | |
| Online Access: | https://www.jafmonline.net/article_2105_19fed5f72064bff6ce88f8d818b70478.pdf |
| _version_ | 1818050738080710656 |
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| author | Z. Jahani H. Khaleghi S. Tabejamaat |
| author_facet | Z. Jahani H. Khaleghi S. Tabejamaat |
| author_sort | Z. Jahani |
| collection | DOAJ |
| description | This paper aims to understand the effects of circumferential inlet distortion and tip injection on a transonic impeller performance and flow field. For distorted inflow, the impeller is subjected to a stationary 120-degrees circumferential total pressure distortion. Full annulus unsteady three-dimensional analysis has been used to study the inlet distortion and tip injection effects on the impeller performance, stability and flow field. The results show that the circumferential inlet distortion reduces the impeller total pressure ratio and adiabatic efficiency; however, it has no significant impact on the safe operating range. Unlike the inlet distortion, the tip injection considerably increases the operating range. According to the results, the distortion and tip injection effect on the compressor performance is mainly due to changes in tip leakage flow. The inlet distortion has unfavorable influences on the flow field, especially near the impeller tip; however, the tip injection ameliorates the flow field in this region. In both the clean and distorted inflow, the tip injection causes downstream shock transmission, weakening the shock-tip leakage interaction. Hence, stall inception is postponed, and the impeller stability is improved in the presence of the tip injection. |
| first_indexed | 2024-12-10T10:58:14Z |
| format | Article |
| id | doaj.art-0e5befe362cb4a789c5a7cdf6e140155 |
| institution | Directory Open Access Journal |
| issn | 1735-3572 1735-3645 |
| language | English |
| last_indexed | 2024-12-10T10:58:14Z |
| publishDate | 2022-09-01 |
| publisher | Isfahan University of Technology |
| record_format | Article |
| series | Journal of Applied Fluid Mechanics |
| spelling | doaj.art-0e5befe362cb4a789c5a7cdf6e1401552022-12-22T01:51:46ZengIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-35721735-36452022-09-011561815182410.47176/jafm.15.06.10892105Using Tip Injection to Stability Enhancement of a Transonic Centrifugal Impeller with Inlet DistortionZ. Jahani0H. Khaleghi1S. Tabejamaat2Department of Aerospace Engineering, Amirkabir University of Technology, 15875-4413, Tehran, IranDepartment of Aerospace Engineering, Amirkabir University of Technology, 15875-4413, Tehran, IranDepartment of Aerospace Engineering, Amirkabir University of Technology, 15875-4413, Tehran, IranThis paper aims to understand the effects of circumferential inlet distortion and tip injection on a transonic impeller performance and flow field. For distorted inflow, the impeller is subjected to a stationary 120-degrees circumferential total pressure distortion. Full annulus unsteady three-dimensional analysis has been used to study the inlet distortion and tip injection effects on the impeller performance, stability and flow field. The results show that the circumferential inlet distortion reduces the impeller total pressure ratio and adiabatic efficiency; however, it has no significant impact on the safe operating range. Unlike the inlet distortion, the tip injection considerably increases the operating range. According to the results, the distortion and tip injection effect on the compressor performance is mainly due to changes in tip leakage flow. The inlet distortion has unfavorable influences on the flow field, especially near the impeller tip; however, the tip injection ameliorates the flow field in this region. In both the clean and distorted inflow, the tip injection causes downstream shock transmission, weakening the shock-tip leakage interaction. Hence, stall inception is postponed, and the impeller stability is improved in the presence of the tip injection.https://www.jafmonline.net/article_2105_19fed5f72064bff6ce88f8d818b70478.pdfcentrifugal impellercircumferential distortionshocktip injectiontip leakage flow |
| spellingShingle | Z. Jahani H. Khaleghi S. Tabejamaat Using Tip Injection to Stability Enhancement of a Transonic Centrifugal Impeller with Inlet Distortion Journal of Applied Fluid Mechanics centrifugal impeller circumferential distortion shock tip injection tip leakage flow |
| title | Using Tip Injection to Stability Enhancement of a Transonic Centrifugal Impeller with Inlet Distortion |
| title_full | Using Tip Injection to Stability Enhancement of a Transonic Centrifugal Impeller with Inlet Distortion |
| title_fullStr | Using Tip Injection to Stability Enhancement of a Transonic Centrifugal Impeller with Inlet Distortion |
| title_full_unstemmed | Using Tip Injection to Stability Enhancement of a Transonic Centrifugal Impeller with Inlet Distortion |
| title_short | Using Tip Injection to Stability Enhancement of a Transonic Centrifugal Impeller with Inlet Distortion |
| title_sort | using tip injection to stability enhancement of a transonic centrifugal impeller with inlet distortion |
| topic | centrifugal impeller circumferential distortion shock tip injection tip leakage flow |
| url | https://www.jafmonline.net/article_2105_19fed5f72064bff6ce88f8d818b70478.pdf |
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