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Analyzing Factors Affecting Gross Indicated Efficiency When Inlet Temperature Is Changed

Lam, Nhut LU ; Tunestål, Per LU and Andersson, Arne (2018) In SAE Technical Papers 2018-September.
Abstract
Observations from engine experiments indicates that the gross indicated efficiency (GIE) increases when the inlet temperature (Tinlet) is lowered. The change in Tinlet affects several important factors, such as the heat release profile (affecting heat and exhaust losses), working fluid properties, combustion efficiency and heat transfer losses. These factors all individually contributes to the resulting change in GIE. However, due to their strong dependency to temperature it is not possible to quantify the contribution from each of these parameters individually. Therefore, a simulation model in GT-power has been created and calibrated to the performed engine experiments. With simulations the temperature dependency can be separated and it... (More)
Observations from engine experiments indicates that the gross indicated efficiency (GIE) increases when the inlet temperature (Tinlet) is lowered. The change in Tinlet affects several important factors, such as the heat release profile (affecting heat and exhaust losses), working fluid properties, combustion efficiency and heat transfer losses. These factors all individually contributes to the resulting change in GIE. However, due to their strong dependency to temperature it is not possible to quantify the contribution from each of these parameters individually. Therefore, a simulation model in GT-power has been created and calibrated to the performed engine experiments. With simulations the temperature dependency can be separated and it becomes possible to evaluate the contribution to GIE from each factor individually. The simulation results indicate that the specific heats of the working medium are the largest contributor. Heat transfer and combustion efficiency are also important factors but are not as significant as the effect from specific heats. (Less)
Please use this url to cite or link to this publication:
author
; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
SAE Technical Papers
volume
2018-September
article number
2018-01-1780
pages
19 pages
publisher
Society of Automotive Engineers
external identifiers
  • scopus:85056896617
ISSN
0148-7191
DOI
10.4271/2018-01-1780
project
Motorkoncept 2
language
English
LU publication?
yes
id
5d50cab9-0bf0-4894-a17a-f8b8e5825b84
date added to LUP
2018-10-21 10:48:32
date last changed
2022-04-25 17:53:47
@article{5d50cab9-0bf0-4894-a17a-f8b8e5825b84,
  abstract     = {{Observations from engine experiments indicates that the gross indicated efficiency (GIE) increases when the inlet temperature (Tinlet) is lowered. The change in Tinlet affects several important factors, such as the heat release profile (affecting heat and exhaust losses), working fluid properties, combustion efficiency and heat transfer losses. These factors all individually contributes to the resulting change in GIE. However, due to their strong dependency to temperature it is not possible to quantify the contribution from each of these parameters individually. Therefore, a simulation model in GT-power has been created and calibrated to the performed engine experiments. With simulations the temperature dependency can be separated and it becomes possible to evaluate the contribution to GIE from each factor individually. The simulation results indicate that the specific heats of the working medium are the largest contributor. Heat transfer and combustion efficiency are also important factors but are not as significant as the effect from specific heats.}},
  author       = {{Lam, Nhut and Tunestål, Per and Andersson, Arne}},
  issn         = {{0148-7191}},
  language     = {{eng}},
  month        = {{09}},
  publisher    = {{Society of Automotive Engineers}},
  series       = {{SAE Technical Papers}},
  title        = {{Analyzing Factors Affecting Gross Indicated Efficiency When Inlet Temperature Is Changed}},
  url          = {{http://dx.doi.org/10.4271/2018-01-1780}},
  doi          = {{10.4271/2018-01-1780}},
  volume       = {{2018-September}},
  year         = {{2018}},
}