Investigation on Flow Characteristics of SVC Nozzles
Shock vectoring control (SVC) is an important method of fluidic thrust vectoring (FTV) for aero-engine exhaust system. It behaves better on nozzle of high pressure ratio, and is considered as an alternative TV technology for a future aero-engine with high thrust-to-weight ratio. In this paper, the f...
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| Format: | Article |
| Language: | English |
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Isfahan University of Technology
2018-01-01
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| Series: | Journal of Applied Fluid Mechanics |
| Subjects: | |
| Online Access: | http://jafmonline.net/JournalArchive/download?file_ID=44729&issue_ID=247 |
| _version_ | 1818964454596935680 |
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| author | S. H. I. Jingwei Z. Wang L. Zhou S. U. N. Xiaolin |
| author_facet | S. H. I. Jingwei Z. Wang L. Zhou S. U. N. Xiaolin |
| author_sort | S. H. I. Jingwei |
| collection | DOAJ |
| description | Shock vectoring control (SVC) is an important method of fluidic thrust vectoring (FTV) for aero-engine exhaust system. It behaves better on nozzle of high pressure ratio, and is considered as an alternative TV technology for a future aero-engine with high thrust-to-weight ratio. In this paper, the flow mechanism and vector performance, including the vector angle (δp) and thrust coefficient (Cfg), of 2D and axisymmetric SVC nozzles were investigated after the validation of turbulence models by experimental data. The influence of aerodynamic parameters, e.g. nozzle pressure ratio (NPR), secondary pressure ratio (SPR) and free-stream Ma number (M∞) on flow characteristics and vector performance were studied numerically, and results show that unbalanced pressure distributions on nozzle internal walls determine δp, while shock waves dominate thrust loss, referring to Cfg. The “pressure release mechanism” of an axisymmetric SVC nozzle causes vector angle about 16.54% smaller than that of a 2D SVC nozzle at NPR of 6. The induced shock wave interacts with nozzle upper wall at SPR of 1.5, and results in the δp of a 2D SVC nozzle 12% smaller. A new parameter (Fy,modi) of side-force was redefined for free-stream conditions, taking the pressure distributions on nozzle external walls into account. Results indicate that pressure connection on nozzle external walls of an axisymmetric SVC nozzle causes vector performance better at M∞ >0.3 and the δp is about 11.2% larger at transonic conditions of M∞ of 0.9 and 1.1. |
| first_indexed | 2024-12-20T13:01:22Z |
| format | Article |
| id | doaj.art-2bd1954616aa4972ab4771051609b18a |
| institution | Directory Open Access Journal |
| issn | 1735-3572 |
| language | English |
| last_indexed | 2024-12-20T13:01:22Z |
| publishDate | 2018-01-01 |
| publisher | Isfahan University of Technology |
| record_format | Article |
| series | Journal of Applied Fluid Mechanics |
| spelling | doaj.art-2bd1954616aa4972ab4771051609b18a2022-12-21T19:39:54ZengIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-35722018-01-01112331342.Investigation on Flow Characteristics of SVC NozzlesS. H. I. Jingwei0Z. Wang1L. Zhou2S. U. N. Xiaolin3Collaborative Innovation Center for Advanced Aero-Engine, School of Power and Energy, Northwestern Polytechnical University, Xi’an, Shaan Xi Province, 710072, ChinaShaanxi Key Laboratory of Internal Aerodynamics in Aero-Engine, School of Power and Energy, Northwestern Polytechnical University, Xi’an, Shan Xi Province, 710072, ChinaShaanxi Key Laboratory of Internal Aerodynamics in Aero-Engine, School of Power and Energy, Northwestern Polytechnical University, Xi’an, Shan Xi Province, 710072, ChinaCollaborative Innovation Center for Advanced Aero-Engine, School of Power and Energy, Northwestern Polytechnical University, Xi’an, Shaan Xi Province, 710072, ChinaShock vectoring control (SVC) is an important method of fluidic thrust vectoring (FTV) for aero-engine exhaust system. It behaves better on nozzle of high pressure ratio, and is considered as an alternative TV technology for a future aero-engine with high thrust-to-weight ratio. In this paper, the flow mechanism and vector performance, including the vector angle (δp) and thrust coefficient (Cfg), of 2D and axisymmetric SVC nozzles were investigated after the validation of turbulence models by experimental data. The influence of aerodynamic parameters, e.g. nozzle pressure ratio (NPR), secondary pressure ratio (SPR) and free-stream Ma number (M∞) on flow characteristics and vector performance were studied numerically, and results show that unbalanced pressure distributions on nozzle internal walls determine δp, while shock waves dominate thrust loss, referring to Cfg. The “pressure release mechanism” of an axisymmetric SVC nozzle causes vector angle about 16.54% smaller than that of a 2D SVC nozzle at NPR of 6. The induced shock wave interacts with nozzle upper wall at SPR of 1.5, and results in the δp of a 2D SVC nozzle 12% smaller. A new parameter (Fy,modi) of side-force was redefined for free-stream conditions, taking the pressure distributions on nozzle external walls into account. Results indicate that pressure connection on nozzle external walls of an axisymmetric SVC nozzle causes vector performance better at M∞ >0.3 and the δp is about 11.2% larger at transonic conditions of M∞ of 0.9 and 1.1.http://jafmonline.net/JournalArchive/download?file_ID=44729&issue_ID=247SVC; Transverse injection; Vector performance; Aerodynamic parameters; Flow control. |
| spellingShingle | S. H. I. Jingwei Z. Wang L. Zhou S. U. N. Xiaolin Investigation on Flow Characteristics of SVC Nozzles Journal of Applied Fluid Mechanics SVC; Transverse injection; Vector performance; Aerodynamic parameters; Flow control. |
| title | Investigation on Flow Characteristics of SVC Nozzles |
| title_full | Investigation on Flow Characteristics of SVC Nozzles |
| title_fullStr | Investigation on Flow Characteristics of SVC Nozzles |
| title_full_unstemmed | Investigation on Flow Characteristics of SVC Nozzles |
| title_short | Investigation on Flow Characteristics of SVC Nozzles |
| title_sort | investigation on flow characteristics of svc nozzles |
| topic | SVC; Transverse injection; Vector performance; Aerodynamic parameters; Flow control. |
| url | http://jafmonline.net/JournalArchive/download?file_ID=44729&issue_ID=247 |
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