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    Design of a Hydraulic Variable Compression Ratio Piston for a Heavy Duty Internal Combustion Engine

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    ThesisAlmudraaAugust2018.pdf
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    4.595Mb
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    Description:
    Thesis Sultan Almudraa
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    Type
    Thesis
    Authors
    Al Mudraa, Sultan cc
    Advisors
    Johansson, Bengt cc
    Committee members
    Thoroddsen, Sigurdur T cc
    Knio, Omar cc
    Program
    Mechanical Engineering
    KAUST Department
    Physical Science and Engineering (PSE) Division
    Date
    2018-07
    Embargo End Date
    2019-07-31
    Permanent link to this record
    http://hdl.handle.net/10754/628064
    
    Metadata
    Show full item record
    Access Restrictions
    At the time of archiving, the student author of this thesis opted to temporarily restrict access to it. The full text of this thesis became available to the public after the expiration of the embargo on 2019-07-31.
    Abstract
    A High percentage of fuel consumption worldwide is in internal combustion engines which has led environmental organizations and authorities to put further pressure on the engine industries to reduce CO2 emissions and enhance engine efficiency. However, historically, the effect of the compression ratio on increasing thermal efficiency of the engine is well known, hence; numerous technical solutions have been proposed to implement a variable compression ratio concept. A new first-class engineering solution to use a hydraulic piston was initially patented by BICERA (British Internal Combustion Engine Research Association) , then improved by Continental and Daimler Benz. A Hydraulic variable compression ratio piston is a hydraulically actuated piston that provides a practical method of obtaining a variable compression ratio piston. In this literature, a hydraulic variable compression ratio piston for a Volvo D13 diesel engine was designed, analyzed, modeled and discussed. This analysis was accomplished by first performing kinematic and dynamic analyses for the piston motion and acceleration based on the crank-slider mechanism. Following this the oil flow characteristics were defined in every mechanical element transferring the oil in its journey from the engine pump to the piston. Moreover, two different designs were proposed in an attempt to predict the compression ratio by modeling the hydraulic, dynamic and engine execution simultaneously. Additionally, stress on the piston was analyzed using Finite Element Analysis (FEA) to assure piston sustainment and rigidity against the harsh combustion chamber environment. In conclusion, the best design was successfully selected and finalized to reach a wide compression ratio range under a boosted inlet pressure based on the selected design, dimensions, check valves and relief valves.
    Citation
    Al Mudraa, S. (2018). Design of a Hydraulic Variable Compression Ratio Piston for a Heavy Duty Internal Combustion Engine. KAUST Research Repository. https://doi.org/10.25781/KAUST-H688T
    DOI
    10.25781/KAUST-H688T
    ae974a485f413a2113503eed53cd6c53
    10.25781/KAUST-H688T
    Scopus Count
    Collections
    Theses; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program

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