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Wai K. Cheng. Wang, YinChun, Ph. D. Massachusetts Institute of Technology Massachusetts Institute of Technology. Department of Mechanical Engineering. Massachusetts Institute of Technology. Department of Mechanical Engineering 2013-07-10T14:50:47Z 2013-07-10T14:50:47Z 2012 2012 http://hdl.handle.net/1721.1/79512 849744861 Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012. Cataloged from PDF version of thesis. Includes bibliographical references (p. 157-163). Diesel engines are widely used in heavy duty transportation applications such as in trucks, buses and ships because of their reliability and high torque output. A key diesel technology is the injection system which is constantly improved to produce better spray quality and deeper spray penetration in the combustion chamber by using high injection pressure and improving the design of the nozzle holes. The hole size has been continuously reduced; future diameters less than 100 um are expected. Smaller nozzle holes are vulnerable to deposit formation, which will reduce the flow rate and affect the spray pattern. The objective of this study is to understand the processes that would lead to deposit formation on the injector nozzle surfaces. In specific, a detailed mechanism is proposed after observing engine and injector simulation results. Models for the physical processes and chemical mechanisms responsible for the deposit formation are developed. These models are incorporated into a integrated software package to facilitate calculations of deposit formation rates under different conditions. A benchscale test rig is also constructed to measure the deposit formation of different fuels and detergents. Experiments show that the test procedure can differentiate good detergents from ineffective ones; hence it can be used to pre-screen the detergents and fuels before engine tests. Thus the cost of testing could be reduced substantially. This study is the first to develop a comprehensive quantitative model for injector nozzle deposit formation and a bench scale testing apparatus encompassing the key deposit formation processes of film formation, evaporation and washing. by YinChun Wang. Ph.D. 163 p. eng Massachusetts Institute of Technology M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 Mechanical Engineering. Study of deposit formation inside diesel injectors nozzles Thesis application/pdf false Publication unknown unknown <Publication xmlns="https://www.openaire.eu/cerif-profile/1.1/" id="97c0c002-f374-4595-8611-6fe64c1c2f54"> <Type xmlns="https://www.openaire.eu/cerif-profile/vocab/COAR_Publication_Types">http://purl.org/coar/resource_type/c_1843</Type> <Language>eng</Language> <Title>Study of deposit formation inside diesel injectors nozzles</Title> <PublishedIn> <Publication> </Publication> </PublishedIn> <PublicationDate>2012</PublicationDate> <Authors> <Author> <DisplayName>Wang, YinChun, Ph. D. Massachusetts Institute of Technology</DisplayName> <Affiliation> <OrgUnit> </OrgUnit> </Affiliation> </Author> </Authors> <Editors> </Editors> <Publishers> <Publisher> <DisplayName>Massachusetts Institute of Technology</DisplayName> <OrgUnit /> </Publisher> </Publishers> <License>http://dspace.mit.edu/handle/1721.1/7582</License> <Keyword>Mechanical Engineering.</Keyword> <Abstract>Diesel engines are widely used in heavy duty transportation applications such as in trucks, buses and ships because of their reliability and high torque output. A key diesel technology is the injection system which is constantly improved to produce better spray quality and deeper spray penetration in the combustion chamber by using high injection pressure and improving the design of the nozzle holes. The hole size has been continuously reduced; future diameters less than 100 um are expected. Smaller nozzle holes are vulnerable to deposit formation, which will reduce the flow rate and affect the spray pattern. The objective of this study is to understand the processes that would lead to deposit formation on the injector nozzle surfaces. In specific, a detailed mechanism is proposed after observing engine and injector simulation results. Models for the physical processes and chemical mechanisms responsible for the deposit formation are developed. These models are incorporated into a integrated software package to facilitate calculations of deposit formation rates under different conditions. A benchscale test rig is also constructed to measure the deposit formation of different fuels and detergents. Experiments show that the test procedure can differentiate good detergents from ineffective ones; hence it can be used to pre-screen the detergents and fuels before engine tests. Thus the cost of testing could be reduced substantially. This study is the first to develop a comprehensive quantitative model for injector nozzle deposit formation and a bench scale testing apparatus encompassing the key deposit formation processes of film formation, evaporation and washing.</Abstract> <Access xmlns="http://purl.org/coar/access_right" > </Access> </Publication>