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    Knocking Cylinder Pressure Data Characteristics in a Spark-Ignition Engine

    Source: Journal of Engineering for Gas Turbines and Power:;2003:;volume( 125 ):;issue: 002::page 494
    Author:
    M. Syrimis
    ,
    D. N. Assanis
    DOI: 10.1115/1.1560709
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: An experimental study of the knock initiation and development period was conducted in a single-cylinder research engine. Cylinder pressure was recorded at two locations in the combustion chamber using a high sampling frequency, thus allowing the identification of spatial and temporal pressure characteristics introduced by knock. It was found that substantial local pressure differences exist inside the chamber during the initiation of autoignition. In most cases, knock-induced pressure waves are of acoustic nature, but they can become weak shock waves in heavily knocking cycles. Waves appear first in the pressure trace of the transducer closer to the site of autoignition, and are subsequently detected by the other transducer. The results show evidence of multiple sites of autoignition, and indicate changes in the nature and the direction of propagation of pressure waves. Cylinder pressure signals sampled at locations closer to the center of the chamber show significantly smaller amplitude of pressure fluctuation, making them more suitable for further mathematical processing.
    keyword(s): Pressure , Transducers , Cylinders , Signals , Waves , Cycles , Sampling (Acoustical engineering) , Combustion chambers AND Engines ,
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      Knocking Cylinder Pressure Data Characteristics in a Spark-Ignition Engine

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/128385
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    • Journal of Engineering for Gas Turbines and Power

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    contributor authorM. Syrimis
    contributor authorD. N. Assanis
    date accessioned2017-05-09T00:10:11Z
    date available2017-05-09T00:10:11Z
    date copyrightApril, 2003
    date issued2003
    identifier issn1528-8919
    identifier otherJETPEZ-26821#494_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/128385
    description abstractAn experimental study of the knock initiation and development period was conducted in a single-cylinder research engine. Cylinder pressure was recorded at two locations in the combustion chamber using a high sampling frequency, thus allowing the identification of spatial and temporal pressure characteristics introduced by knock. It was found that substantial local pressure differences exist inside the chamber during the initiation of autoignition. In most cases, knock-induced pressure waves are of acoustic nature, but they can become weak shock waves in heavily knocking cycles. Waves appear first in the pressure trace of the transducer closer to the site of autoignition, and are subsequently detected by the other transducer. The results show evidence of multiple sites of autoignition, and indicate changes in the nature and the direction of propagation of pressure waves. Cylinder pressure signals sampled at locations closer to the center of the chamber show significantly smaller amplitude of pressure fluctuation, making them more suitable for further mathematical processing.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleKnocking Cylinder Pressure Data Characteristics in a Spark-Ignition Engine
    typeJournal Paper
    journal volume125
    journal issue2
    journal titleJournal of Engineering for Gas Turbines and Power
    identifier doi10.1115/1.1560709
    journal fristpage494
    journal lastpage499
    identifier eissn0742-4795
    keywordsPressure
    keywordsTransducers
    keywordsCylinders
    keywordsSignals
    keywordsWaves
    keywordsCycles
    keywordsSampling (Acoustical engineering)
    keywordsCombustion chambers AND Engines
    treeJournal of Engineering for Gas Turbines and Power:;2003:;volume( 125 ):;issue: 002
    contenttypeFulltext
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