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Simulating cavitation erosion of cylinder liner caused by wall vibration |
DU Huiyong, LI Pengtao, LI Min, LIU Jianxin, WANG Zhancheng, XU Bin |
College of Vehicle & Traffic Engineering, Henan University of Science & Technology, Luoyang, Henan 471003, China |
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Abstract To study the cylinder wall vibration cased by the knocking piston to cylinder liner cavitation which is near the cooling water flow field by wall vibration, using computational fluid dynamics(CFD)method, based on Eulerian multiphase cavitation models provided by AVL-Fire computational fluid software, combined with the dynamic mesh technology to build multiphase cavitation models in the flow field region near the wall, the cylinder wall vibration characteristics of the cavitation erosion of cylinder liner are analyzed, coupled with the flow field characteristics, getting cavitation characteristics of flow field under the condition of cylinder wall vibration attenuation. From the cavitation field picture, we can come to the conclusion that the cylinder wall surface vibration is the decisive factor of the cylinder liner cavitation. The cavitation bubbles caused by the vibration effected to wall will be aggregated on the narrow gap arc wall and collapsed, causing more serious cavitation near here. The simulation results are in agreement with the experimental results of the cylinder linering.Compared with cavitation erosion characteristics at different inlet velocity under the cyclinder wall vibration, the flow field produces cavitation area easily at the large flow velocity.
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Received: 05 December 2015
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