Visualization of Flow-Field between the Flapper and Nozzle in a Hydraulic Servo-Valve

Abstract:

In order to understand the mechanism and get rid of the high-frequency self-excited noise in a hydraulic servo-valve, in this paper, the flow field distribution in the pilot stage of a hydraulic flapper-nozzle servo-valve is investigated. An assembly is prepared representing the construction and working principle of the flow field inside the pilot stage of a hydraulic flapper-nozzle servo-valve. A method of visualization is developed by taking videos for the flow field inside the transparent assembly with a high speed video camera. In this study, at different inlet pressure the high speed video camera was utilized for flow visualization together with computer-assisted image measurement. The shape of the jet flow, the cavitations and vortex flow inside the flow field can be visualized clearly. The proposed method enables to analyze the flow-field in the pilot stage of a hydraulic flapper-nozzle servo-valve by giving useful information for better design.

• Periodical: Advanced Materials Research (Volume 402)
• Pages: 407-411
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.402.407
• Online since: November 2011
• Authors: Jacob M. Mchenya, Sheng Zhuo Zhang, Song Jing Li
• Keywords: Flapper-Nozzle, Flow Field, Servo-Valve, Visualization

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