Natural Gas Engine Thermodynamic Modeling Concerning Offshore Dynamic Condition

Sadi Tavakoli*, Eilif Pedersen, Jesper Schramm

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

Modeling a complex engineering system, containing a series of energy-based components, is not a trivial task. Marine propulsion system which typically consists of engine, transmission and propeller, ought to be modeled simultaneously in order to predict the real conditions, accurately. This work which is part of a main project entitled “Ship propulsion dynamic and emission”, takes aim at presenting a set of thermodynamic equations applied in GT Power software for modeling a spark ignition engine fueled by liquid natural gas. Moreover, marine engines usually encounter wave loads during a journey, then a transient harmonic condition is implemented on the engine to specify performance and emission compounds. The results show that any variation on engine speed, influences engine power directly. Although harmonic load fluctuation is less than variation of speed, the rate of change of load amplitude is more than rate of change of speed amplitude, meaning that 4% and 8% speed oscillation contributes to 1.4 and 3.2% load oscillation, respectively. In addition, the sensitivity of a natural gas engine to air fuel ratio and control system is also presented.

Original languageEnglish
Title of host publicationPractical Design of Ships and Other Floating Structures. PRADS 2019.
EditorsTetsuo Okada, Yasumi Kawamura, Katsuyuki Suzuki
Place of PublicationSingapore
PublisherSpringer
Publication date2021
Pages820-841
ISBN (Print)978-981-15-4671-6
ISBN (Electronic)978-981-15-4672-3
DOIs
Publication statusPublished - 2021
EventThe 14th International Symposium on Practical Design of Ships and Other Floating Structures (PRADS 2019) - Yokohama, Japan
Duration: 22 Sep 201926 Sep 2019

Conference

ConferenceThe 14th International Symposium on Practical Design of Ships and Other Floating Structures (PRADS 2019)
CountryJapan
CityYokohama
Period22/09/201926/09/2019
SeriesLecture Notes in Civil Engineering
Volume64
ISSN2366-2557

Keywords

  • Dynamic speed
  • Natural gas engine
  • Thermodynamic modeling
  • Transient load

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