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Failure in Fuel Injector Nozzles Used in Diesel Engines
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作者 Jose Costa de Macedo Neto Marina Anunciacao Brito de Oliveira +3 位作者 Eduardo Rafael Barreda del Campo Ricardo Wilson Aguiar Da Cruz Nayra Reis do Nascimento Joao Evangelista Neto 《Journal of Mechanics Engineering and Automation》 2015年第4期237-240,共4页
This paper aims to conduct a study of the problems associated with the wear of the needles and fuel injection nozzles utilized in diesel engines. The wear found on the needles is mainly associated to impurities in the... This paper aims to conduct a study of the problems associated with the wear of the needles and fuel injection nozzles utilized in diesel engines. The wear found on the needles is mainly associated to impurities in the fuel oil and microcavitation occurred due to high pressure in the phase of the air compression for combustion of the combustible fluid. These pressures associated with the temperature and the fluid velocity results in the occurrence of vaporization, which releases shock waves that cause damage to the affected surface. The impurities solid particles from the fuel oil cause problems inside the nozzles as obstruction of the holes and wear on the needle tip and nozzle seat surface. These failures affect in the atomization of the fuel, since the deterioration of the internal passages of the nozzles interferes in the spray formation and in the end passage of the fluid. For the execution of this study it will be used digital microscopic analysis in specimens that suffered damage, in order to investigate the effects of fuel property, and the temperature conditions and pressure in the formation of the wear on the needles and injector nozzle. 展开更多
关键词 fuel injector nozzle injector needles wear.
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Characterization and life prediction of single-pass honing tool for fuel injection nozzle 被引量:1
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作者 Changyong YANG Hao SU +4 位作者 Shaowu GAO Qingfeng AI Yucan FU Wenfeng DING Jiuhua XU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2021年第4期225-240,共16页
Single-pass honing is an important machining method for finish machining of holes,which can meet the requirement for high efficiency and consistency of holes.Characterization and life prediction of single-pass honing ... Single-pass honing is an important machining method for finish machining of holes,which can meet the requirement for high efficiency and consistency of holes.Characterization and life prediction of single-pass honing tool are necessary to improve the machining accuracy of holes honed,especially dimension accuracy.Single-pass honing tool is a single layer abrasive tool with fixed dimension,which still remains problematic for characterization and life prediction.For fuel injection nozzles with bore diameter under 1 mm,the stiffness of the single-pass honing tool is poor.This article presents a novel analytical model that predicts life of the tool with poor stiffness.Firstly,according to the bore diameter and dimension tolerance,the single-pass honing tool is designed and manufactured.Based on the prepared single-pass honing tool,the measurement and characterization methods are established.Furthermore,the tool wear tests are carried out,and the tool contour evolution model is established to predict the tool life. 展开更多
关键词 fuel injection nozzle Life prediction Single-pass honing tool Tool contour evolution Tool stiffness
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