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김진영(Jinyoung kim),박원옥(Wonok park),공태원(Teawon Kong),하종률(Jongyul Ha) 한국자동차공학회 2003 한국 자동차공학회논문집 Vol.11 No.3
Natural gas is one of the promising altemative fuels because of the abundant deposits and the cleanness of emission gas. CNG has a lot of merits except lower buming speed has a slow disadvantage. One way to overcome the disadvantage is to raise a turbulence intensity. We give various intake for changing turbulence intensity in the cylinder by three kinds of swirl control valve with a way to raise a turbulence intensity. In the present study, a 1.8 ℓ conventional gasoline engine is modified to use a CNG as a fuel instead of gasoline. We try to verify combustion and emission characteristics in each engine parameters. Parameters of experimentation are equivalence ratio, spark timing and intake flow change. The results of this study are as follows. In the case of adding swirl flow, burning speed and torque are increased. But NOx and THC concentration are increased a little respectively.