Journal of ILASS-Korea (한국분무공학회지)

Institute for Liquid Atomization and Spray Systems-Korea (한국분무공학회)
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Numerical Study of Combustion Characteristics in CNG DI Engine using Gaseous Sphere Injection Model

기체구 분사 모델을 이용한 CNG DI 엔진의 연소특성 수치해석

  • 최민기 (한양사이버대학교(기계자동차공학부))
  • Received : 2019.09.25
  • Accepted : 2019.11.09
  • Published : 2019.12.30
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Abstract

This paper describes numerical study of combustion characteristics in CNG(compressed natural gas) DI(direct injection) engine using gaseous sphere injection model. Simulations were conducted using KIVA-3V Release 2 code. Gaseous sphere injection model, which is modified model of liquid fuel injection, was used to simulate the CNG direct injection. Until now, a very fine mesh smaller than the injector nozzle has been required to resolve the gas-jet inflow boundary. However, the gaseous sphere injection model simulates gaseous fuel injection using a coarse mesh. This model injects gaseous spheres as in liquid fuel injection and the gaseous spheres evaporate together without the latent heat of evaporation. Therefore, it does not require a very fine mesh and reduce calculation time. Combustion simulation were performed under various injection timings and injection pressures.

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References

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