Effects of the Inlet Flow Conditions of a Helical Intake Port on the In-cylinder Swirl Characteristics

나선형 흡기포트 입구의 유동조건이 실린더 내 선회특성에 미치는 영향에 관한 연구

  • 이지근 (회원, 전북대학교 국책지원사업단) ;
  • 강신재 (회원, 전북대학교 기계공학부)
  • Published : 2000.03.01

Abstract

Combustion and emission characteristics in a direct injection diesel engine is closely related to the intake port system. It is therefore important to understand the swirl flow characteristics formed by a helical intake port. However there are still many uncertainties. The purpose of this experimental study is to investigate the effects of the valve eccentricity ratio and the inlet flow conditions of a helical intake port on the characteristics of an in-cylinder swirl flow. A steady state flow test rig consisted of ISM(impulse swirl meter), LFM(laminar flow meter) and cylinder head with a helical intake port was used. The swirl ratio(Rs) and mean flow coefficient(Cf(mean)) with inlet flow conditions were measured. The results of these experiment can be summarized as follows. Swirl flow characteristics of a helical intake port are affected by the inlet flow conditions, and especially they are much affected by the length of a manifold runner and the rotational angle of a curved manifold runner.

Keywords

References

  1. SAE730169 Factors Affecting Smoke and Gaseous Emissions form Direct Injection Engines and a Method of Calculation Khan, I.M.;Greeves, G.;Wang, C.H.T.
  2. SAE770404 A New Method of Investigation of Swirl Ports Tippelmann, G.
  3. SAE810255 Air Motion and its Effect on Diesel Performance and Emissions Monaghan, M.L.;Pettifer, H.F.
  4. SAE900100 Diesel Engine Cylinder Head Design : The Compromises and The Techniques Gale, N.F.
  5. SAE921642 The measurement and Analysis of Swirl Flow in Steady Flow Stone. C.R.;Ladommatos, N.
  6. 한국자동차공학회논문집 v.6 no.1 4밸브 디젤기관의 흡기포트 형상에 따른 실린더 내 편심 선회유동특성에 관한 실험적 연구 이지근;김덕진;강신재;노병준