LAPSE:2019.1312
Published Article
LAPSE:2019.1312
A Numerical Research on Vortex Street Flow Oscillation in the Double Flapper Nozzle Servo Valve
Liang Lu, Shirang Long, Kangwu Zhu
December 10, 2019
The oscillating flow field of the double nozzle flapper servo valve pre-stage is numerically analyzed through Large Eddy Simulation (LES) turbulent modeling with the previous grid independence verification. The vortex street flow phenomenon can be observed when the flow passes through the nozzle flapper channel, the vortex alternating in each side produces the periodical flow oscillation. The structural and flow parameter effects on the oscillating flow are emphasized, and it could be determined that the pressure on the flapper is nearly proportional to the flow velocity and inversely proportional to the actual distance between the flapper and the nozzle. On the other hand, the main frequency of oscillation decreases with the velocity and increases with the distance between the nozzle flapper. The main stage movement is further considered with a User Defined Function (UDF), and it could be determined that the influences of the structural and flow parameters on the flow oscillation are rarely changed, but the main frequencies drop, generally.
Keywords
Computational Fluid Dynamics, double flapper nozzle servo valve, Karman vortex, self-sustained flow oscillation
Suggested Citation
Lu L, Long S, Zhu K. A Numerical Research on Vortex Street Flow Oscillation in the Double Flapper Nozzle Servo Valve. (2019). LAPSE:2019.1312
Author Affiliations
Lu L: School of Mechanical Engineering, Tongji University, Shanghai 200092, China
Long S: School of Mechanical Engineering, Tongji University, Shanghai 200092, China
Zhu K: Shanghai Institute of Aerospace Control Technology, Shanghai 201109, China; Shanghai Servo System Engineering Technology Research Center, Shanghai 201109, China
Journal Name
Processes
Volume
7
Issue
10
Article Number
E721
Year
2019
Publication Date
2019-10-11
Published Version
ISSN
2227-9717
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Original Submission
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PII: pr7100721, Publication Type: Journal Article
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LAPSE:2019.1312
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doi:10.3390/pr7100721
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Dec 10, 2019
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[v1] (Original Submission)
Dec 10, 2019
 
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Dec 10, 2019
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Original Submitter
Calvin Tsay
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