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Numerische Untersuchung unkontrollierter vorzeitiger Selbstzündprozesse unter motorrelevanten Bedingungen

Magar, Max

Abstract (englisch):

In the present work premature and uncontrolled auto-ignition phenomena in boosted spark ignition direct injection (DISI) engines also referred to as „pre-ignition“ or more commonly as „low-speed pre-ignition (LSPI)“ have been investigated. The work focuses on the identification of the fundamental processes triggering LSPI in order to provide a deeper understanding of this irregular combustion mode and enabling the development of mitigation strategies.
LSPI represents an irregular combustion phenomenon that is associated with modern high efficiency engine concepts, i. e. downsized DISI engines, posing a serious challenge in SI engine development. The premature onset of combustion, occurring before the spark plug fires, generally provokes severe engine knock. The most interesting feature of LSPI is the fact that it may occur in bursts consisting of several pre-ignition events alternating with regular cycles. In recent years LSPI has become a prominent issue in SI engine development. A considerable research effort has been spent to unfold the underlying mechanisms of this combustion phenomenon driven by the following reasons: First of all LSPI has a fatal impact on engine durability. ... mehr

Volltext §
DOI: 10.5445/IR/1000073576
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Technische Thermodynamik (ITT)
Publikationstyp Hochschulschrift
Publikationsjahr 2017
Sprache Deutsch
Identifikator urn:nbn:de:swb:90-735760
KITopen-ID: 1000073576
Verlag Karlsruher Institut für Technologie (KIT)
Umfang XIV, 145 S.
Art der Arbeit Dissertation
Fakultät Fakultät für Maschinenbau (MACH)
Institut Institut für Technische Thermodynamik (ITT)
Prüfungsdatum 23.11.2016
Schlagwörter Vorentflammung, Reaktionskinetik, numerische Simulation, Selbstzündung
Referent/Betreuer Maas, U.
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