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International Journal of Automotive Technology

, Volume 20, Issue 5, pp 1065–1071 | Cite as

Development of Heat Transfer Model at Intake System of IC Engine with Consideration of Backflow Gas Effect

  • Emir Yilmaz
  • Mitsuhisa Ichiyanagi
  • Takashi SuzukiEmail author
Article
  • 10 Downloads

Abstract

Improving thermal efficiency of internal combustion engines has been a priority in the automotive industry. It is necessary to model the heat transfer phenomenon at the intake system and precisely predict intake air’s mass flow rate into the engine cylinder. In the previous studies, the heat transfer at the intake system was modeled as quasi-steady state phenomenon, based on Colburn analogy. Authors developed two empirical equations with the introduction of Graetz and Strouhal numbers. In the present study, further improvements were done by the addition of pressure ratio between the intake manifold and atmospheric pressure, along with Reynolds number in order to characterize the backflow gas effect on intake air temperature. Compared with the experimental results, maximum and average errors of intake air temperature estimations inside the manifold found to be 2.9 % and 0.9 %, respectively.

Key Words

Engine Intake manifold Heat transfer Backflow gas Intake air temperature 

Nomenclature

A

heat transfer area (m2)

cp

specific heat capacity at constant pressure (J/(kg·K))

D

manifold diameter (m)

f

opening and closing frequency of the intake valve (Hz)

Gz

graetz number (-)

l

manifold length (m)

m, m1

undetermined coefficient (-)

mass flow rate (kg/s)

n1, n2

exponential index (-)

Tg

average gas temperature (K)

Ti

inlet temperature (K)

To

outlet temperature (K)

Ts

average manifold wall surface temperature (K)

Pa

atmospheric pressure (kPa)

Pr

prandtl number (-)

P{ntmanf}

intake manifold pressure (kPa)

Re

reynolds number (-)

St

strouhal number (-)

u

average gas velocity inside the manifold (m/s)

α

heat transfer coefficient (W/(m2·K))

λ

thermal conductivity of air (W/(m·K))

ϕ

pressure ratio (-)

ρ

density of air (kg/m3)

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Notes

Acknowledgement

This research was subsidized by the Japan Society for the Promotion of Science Grant-in-Aid for Scientific Research and Basic Research (C) (No. 16 K06129).

References

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Copyright information

© KSAE 2019

Authors and Affiliations

  • Emir Yilmaz
    • 1
  • Mitsuhisa Ichiyanagi
    • 2
  • Takashi Suzuki
    • 2
    Email author
  1. 1.Graduate School of Science and TechnologySophia UniversityTokyoJapan
  2. 2.Department of Engineering and Applied SciencesSophia UniversityTokyoJapan

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