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KSME Journal

, Volume 10, Issue 4, pp 471–479 | Cite as

A numerical and experimental study on the optimal design for the intake system of the MPI spark ignition engines

  • Jae-soon Lee
  • Keon-Sik Yoon
Article

Abstract

A computer program has been developed to predict the engine performance characteristics through the analysis of the flow in the intake and exhaust systems and of the cylinder combustion phenomena for the MPI spark ignition engines. Using the program, a study for the optimal design of the intake system has been performed by varying the factors which can influence the volumetric efficiency, such as the volume of the plenum chamber, the length of the intake manifold and the pipe length between the surge tank and the plenum chamber. Experimental tests have also been carried out to obtain the transient pressure history in the intake manifold and the cylinder, and the variations of volumetric efficiency over the various engine speeds. The result of simulation has been compared with that of experimental test, and the optimal design data for the test engine could be found. The comparison of volumetric efficiency shows good agreement between the simulation and experiment.

Key Words

Volumetric Efficiency Method of Characteristics Intake System Simulation 

Nomenclature

a

Speed of sound

aq

Annand constant for convective heat transfer

Af

Area of the flame front

b

Annand constant for convective heat transfer

c

Annand constant for radiative heat transfer

Cp

Constant pressure specific heat

Cv

Constant volume specific heat

D

Diameter

f

Friction factor

ff

Turbulent flame factor

F

Area

k

Specific heat ratio

m

Mass

N

Engine speed

P

Pressure

q

Rate of heat transfer per unit mass

Q

Total heat flux

R

Gas constant

Re

Reynolds number

t

Time

T

Temperature

u

Velocity or internal energy

ut

Laminar flame speed

ut

Turbulent flame speed

V

Volume

x

Distance

α

Crank angle

ρ

Density

suffices

c

Cylinder

e

Exhaust

i

Intake

m

Unburnt mixture

o

Stagnation state

p

Pipe or combustion product

w

Wall

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References

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Copyright information

© The Korean Society of Mechanical Engineers (KSME) 1996

Authors and Affiliations

  • Jae-soon Lee
    • 1
  • Keon-Sik Yoon
    • 2
  1. 1.Dept of Mechanical EngineeringKon-kuk Univ.SeoulKorea
  2. 2.Dept. of Mechanical EngineeringChangwon National Univ.ChangwonKorea

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