Next Article in Journal
Application of Artificial Neural Networks in Assessing Mining Subsidence Risk
Previous Article in Journal
Railway Wheel Flat Recognition and Precise Positioning Method Based on Multisensor Arrays
Open AccessArticle

Numerical Investigation of Erosion Wear in the Hydraulic Amplifier of the Deflector Jet Servo Valve

by Hao Yan 1,*, Jing Li 1, Cunkun Cai 2 and Yukai Ren 1
1
School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China
2
Beijing Research Institute of Precision Mechatronics and Controls, Beijing 100076, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(4), 1299; https://doi.org/10.3390/app10041299 (registering DOI)
Received: 1 January 2020 / Revised: 4 February 2020 / Accepted: 7 February 2020 / Published: 14 February 2020
(This article belongs to the Section Mechanical Engineering)
Although possessing a remarkable anti-contamination capacity, the deflector jet valve is still confronted with erosion wear brought by solid particles in hydraulic oil. To describe the erosion wear mechanism in the hydraulic amplifier of servo valves, a RANS-based CFD simulation is conducted to obtain its internal wear distribution following the Oka erosion model, which shows the erosion wear in servo valves can be divided into four levels and the major wear happens on the shunt wedge, characterized by a regular and fluctuant distribution. Further, there exist multiple relative maximums of erosion rates, whose locations deviate from the jet center. On this basis, the correlation between the contamination level of hydraulic oil and the degree of erosion wear is established. Moreover, according to the working mechanism of the hydraulic amplifier, a new failure criterion of the deflector jet valve is proposed to carry out valve lifespan analyses. Then, a lifespan prediction formula is obtained, and calculations show that hydraulic oil must have a contamination level superior to NAS 5 if a lifespan of over 20,000 h is expected.
Keywords: erosion wear; hydraulic amplifier; numerical simulation; deflector jet servo valve. erosion wear; hydraulic amplifier; numerical simulation; deflector jet servo valve.
MDPI and ACS Style

Yan, H.; Li, J.; Cai, C.; Ren, Y. Numerical Investigation of Erosion Wear in the Hydraulic Amplifier of the Deflector Jet Servo Valve. Appl. Sci. 2020, 10, 1299.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop