Modeling and simulation of the starting procedure of a large two-stroke marine diesel engine

Μουρνιανάκης, Κωνσταντίνος; Mournianakis, Konstantinos

dc.contributor.author	Μουρνιανάκης, Κωνσταντίνος	el
dc.contributor.author	Mournianakis, Konstantinos	en
dc.date.accessioned	2016-03-24T11:48:37Z
dc.date.available	2016-03-24T11:48:37Z
dc.date.issued	2016-03-24
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/42256
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.11783
dc.rights	Default License
dc.subject	Marine diesel engine	en
dc.subject	Starting system	en
dc.title	Modeling and simulation of the starting procedure of a large two-stroke marine diesel engine	en
heal.type	bachelorThesis
heal.classification	Marine engineering	en
heal.classificationURI	http://id.loc.gov/authorities/subjects/sh85081157
heal.language	en
heal.access	free
heal.recordProvider	ntua	el
heal.publicationDate	2015-11-05
heal.abstract	The present thesis focuses on the modeling and the simulation of the starting procedure of a large marine two-stroke diesel engine with direct admission of compressed air into the cylinders, through separate valves fitted on each cylinder. Simulations for a representative propulsion engine are performed to investigate the engine – propeller - ship interaction during the starting phase of the engine. The compressor performance during this phase is also examined. The main components of the pneumatic starting system and their operation are described in Chapter 2. The models of the main thermodynamic and mechanical elements, that are used to configure the engine structure, are described in Chapter 3. The main components of the starting system are modeled using the thermodynamic elements of the engine simulation code. Furthermore, a simplified model to predict the static friction of the shafting system and the friction torque, as a function of the engine speed, is also introduced in Chapter 4. During the starting phase of a turbocharged engine, the turbocharging system is operating in off – design points. Thus, it is necessary to adequately model its transient behavior during this phase. The performance prediction of the turbocharger for low load operation is based on the extension of compressor and turbine maps, as it is described in Chapter 5. A model capable of predicting the transient behavior of a propulsion engine, requires the calculation of the propeller torque demand. Hence, a propeller model capable of estimating the thrust and torque characteristics, in four quadrants of propeller operation, is introduced in Chapter 6. Such a model enables the performance prediction of the propulsion system under any transient operating condition. The performance characteristics of the propeller depend on the ship’s axial speed, so a ship surge model is included. The derived models are integrated into the MOtor THERmodynamics (MOTHER) engine simulation and performance prediction code and are used to simulate the transient behavior of a representative large marine two-stroke diesel engine. Various simulations are performed to investigate the engine – propeller – ship interaction during the starting phase of the engine. The limited engine performance during this phase, due to poor turbocharger performance, is also investigated. Lastly, a crash-stop manoeuvre simulation is performed.	en
heal.advisorName	Κυρτάτος, Νικόλαος	en
heal.committeeMemberName	Παπαλάμπρου, Γεώργιος	en
heal.committeeMemberName	Παπαδόπουλος, Χρήστος	en
heal.academicPublisher	Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Ναυπηγών Μηχανολόγων Μηχανικών. Τομέας Ναυτικής Μηχανολογίας	el
heal.academicPublisherID	ntua
heal.numberOfPages	82 σ.
heal.fullTextAvailability	true