Research on Moderate Thermal Insulation of Highly Strengthened Diesel Engine piston

Yuwei Liu; Yuanzhi Sun; Yang Wang; Ruiyan Mao; Zixi Wang

doi:10.6180/jase.202210_25(5).0017

Research on Moderate Thermal Insulation of Highly Strengthened Diesel Engine piston

Yuwei Liu This email address is being protected from spambots. You need JavaScript enabled to view it.¹, Yuanzhi Sun¹, Yang Wang¹, Ruiyan Mao², and ZixiWang¹

¹School of Mechanical Electronic Information Engineering, China University of Mining &Technology-Beijing, 100083 Beijing, China
²Guizhou Transportation Planning Survey & Design Academe Co. Ltd, 550081, Guiyang, China

Received: June 29, 2021
Accepted: November 6, 2020
Publication Date: January 18, 2022

Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Download Citation: ||https://doi.org/10.6180/jase.202210_25(5).0017

ABSTRACT

Thermal insulation coating at the top surfaces of the piston can reduce the thermal loads and improve its service life. The AlCrN coating was used for the heat insulation of a highly strengthened diesel engine aluminum alloy piston and the finite element model of piston was established. The influences of the coating on the piston temperature field and thermal stress field were analyzed and compared. Results show that the AlCrN coating effectively decreases the working temperature of the piston head and the first ring groove, and those temperatures decrease with the increase of the coating thickness. When the coating thickness is 60 m, the maximum temperature of the substrate of the piston and the average temperature of the first ring groove decrease 18.1% and 14.5%, respectively. The thermal stress of the upper portion of the back surface, pin hole edge and the first ring decreased respectively 22.8%, 12.6% and 13.8%.

Keywords: Highly strengthened piston; Thermal insulation coating; Finite element method; Thermal analysis

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