A Study on Improvement of Indicated Thermal Efficiency of ICE Using High Compression Ratio and Reduction of Cooling Loss

Fujimoto, Hidefumi; Yamamoto, Hiroyuki; Fujimoto, Masahiko; Yamashita, Hiroyuki

doi:10.4271/2011-01-1872

Cited by 17 publications

(13 citation statements)

References 4 publications

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“…Additionally, all underlying metal was changed to iron/steel to take advantage of the lower thermal conductivity. 8 This is similar to the wall configuration used in Fujimoto's [16] LHR engine model, and will be used in all of the LHR configurations in this paper. Although this particular coating is somewhat thicker than examples seen in practice, it does not seem excessively so.…”

Section: Figure 4 Distribution Of Heat Outflow By Location In a Convmentioning

confidence: 97%

“…In addition, there is no mechanical exergy remaining in the exhaust, so work regeneration is no longer possible. 16 That leaves two options for further efficiency improvement; either utilize the thermal exergy in the exhaust through heat regeneration, or minimize the thermal exergy remaining in the exhaust by beginning the expansion stroke at a lower entropy state-either by transferring entropy out, or by generating less entropy before the expansion. We will first address the possibility of reducing the entropy of the postcombustion state; then we will explore the effect of utilizing thermal exhaust exergy.…”

Section: Figure 7 Exergy Breakdown For Three Lhr Engine Configuratiomentioning

confidence: 99%

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Exploring the Pathway to High Efficiency IC Engines through Exergy Analysis of Heat Transfer Reduction

Johnson

Edwards

2013

SAE Int. J. Engines

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Heat transfer is one of the largest causes of exergy destruction in modern engines. In this paper, exergy distribution modeling was used to determine the potential of reduced engine heat transfer to provide significant gains in engine efficiency. As known from prior work, of itself, reducing heat transfer creates only a small increase in efficiency-most of the exergy is redirected into the exhaust stream-requiring both mechanical and thermal recovery of the exhaust exergy. Mechanical regeneration, through turbocharging and over-expansion, can lead to efficiencies exceeding 50%. Adding thermal regeneration, through high enthalpy steam injection or a bottoming cycle, can increase the efficiency potential to approximately 60%. With implementation of both mechanical and thermal regeneration, the only remaining cause of substantial exergy destruction is the combustion process. Thus, efficiency gains significantly beyond 60% are only possible by reducing the entropy generated in the fuel conversion process.

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Section: Figure 4 Distribution Of Heat Outflow By Location In a Convmentioning

confidence: 97%

Section: Figure 7 Exergy Breakdown For Three Lhr Engine Configuratiomentioning

confidence: 99%

Exploring the Pathway to High Efficiency IC Engines through Exergy Analysis of Heat Transfer Reduction

Johnson

Edwards

2013

SAE Int. J. Engines

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“…Keywords : ICEs, Heat insulated coating, Wall heat transfer, Modeling, Thin-film thermocouple, PIV (Assanis and Badillo, 1987), ( Fujimoto et al, 2011), (Yamashita et al, 2012, (Kosaka et al, 2013) Initial wall temperature (K) 298…”

Section: Introductionmentioning

confidence: 99%

“…Direct Numerical Simulation (Yenerdag et al, 2017), (Kondo et al, 2017) (Fuyuto et al, 2006) ( , 2011) μPIV 50μm~100m (Jainski et al, 2012), ( , 2016), 1 1 (Fujimoto et al, 2011) kHz (…”

mentioning

confidence: 99%

“…In addition, non-dimensional velocity distribution in wall boundary layer was not changed drastically by wall temperature behavior. In terms of modeling under heat insulated condition, wall heat flux was able to be predicted well by wall heat transfer model taking into account of density change in wall boundary layer.Keywords : ICEs, Heat insulated coating, Wall heat transfer, Modeling, Thin-film thermocouple, PIV (Assanis and Badillo, 1987), ( Fujimoto et al, 2011), (Yamashita et al, 2012, (Kosaka et al, 2013) Initial wall temperature (K) 298Initial gas pressure Atmospheric Pressure (Han and Reitz, 1997)(Harada et al, 2017) Harada, Y., Uchida, K., Tanaka, T., Sato, K., Qianjin, Z., Fujimoto, H., Yamashita, H. and Tanahashi, M., Wall heat transfer of undeveloped turbulent flow in internal combustion engines, COMODIA2017 (2017), A204. …”

mentioning

confidence: 99%

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Effect of wall heat insulation on wall heat transfer mechanism in rapid compression and expansion environment

Harada

Tanaka

Nakao

et al. 2018

Transactions of the JSME (In Japanese)

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Heat insulation by a wall material which has low heat capacity and heat conductivity is one of the effective ways to reduce heat transfer. By the heat insulated coating, wall temperature is fluctuated following the behavior of in-cylinder gas temperature, which decreases the gap between gas and wall temperature. In order to suppress wall heat transfer in wide engine operation range, Model Based Development is required. In this study, wall heat transfer mechanism under wall temperature fluctuated condition by heat insulation was investigated by simultaneous measurement of wall heat flux and flow behavior in wall boundary layer in RCEM. As a result, it was clarified that turbulent energy was influenced by wall temperature behavior, which impact on heat transfer coefficient. In addition, non-dimensional velocity distribution in wall boundary layer was not changed drastically by wall temperature behavior. In terms of modeling under heat insulated condition, wall heat flux was able to be predicted well by wall heat transfer model taking into account of density change in wall boundary layer.Keywords : ICEs, Heat insulated coating, Wall heat transfer, Modeling, Thin-film thermocouple, PIV (Assanis and Badillo, 1987), ( Fujimoto et al., 2011), (Yamashita et al., 2012, (Kosaka et al., 2013) Initial wall temperature (K) 298Initial gas pressure Atmospheric Pressure (Han and Reitz, 1997)(Harada et al., 2017) Harada, Y., Uchida, K., Tanaka, T., Sato, K., Qianjin, Z., Fujimoto, H., Yamashita, H. and Tanahashi, M., Wall heat transfer of undeveloped turbulent flow in internal combustion engines, COMODIA2017 (2017), A204. © The Japan Society of Mechanical EngineersHuh, K.Y., Chang, I.P. and Martin, J.K., A comparison of boundary layer treatments for heat transfer in IC engines, SAE Paper, No.900252 (1990).Jainski, C., Lu, L., Dreizler, A. and Sick, V., High-speed micro particle image velocimetry studies of boundary-layer flows in a direct-injection engine, International Journal of Engine Research, Vol.14, No.3 (2012), pp. 247-259. , , , Vol.47, No.1 (2016), pp.47-54. , , , B , Vol.77, No.784, (2011

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Conjugate heat transfer analysis of methane/air premixed flame – Wall interaction: A study on effect of wall material

Kai

Masuda

Ikedo

et al. 2020

Applied Thermal Engineering

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A Study on Improvement of Indicated Thermal Efficiency of ICE Using High Compression Ratio and Reduction of Cooling Loss

Cited by 17 publications

References 4 publications

Exploring the Pathway to High Efficiency IC Engines through Exergy Analysis of Heat Transfer Reduction

Exploring the Pathway to High Efficiency IC Engines through Exergy Analysis of Heat Transfer Reduction

Effect of wall heat insulation on wall heat transfer mechanism in rapid compression and expansion environment

Conjugate heat transfer analysis of methane/air premixed flame – Wall interaction: A study on effect of wall material

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