A Study on the Effect of Exhaust System Configuration on Scavenging Characteristic of a Four-Cylinder Turbocharged Diesel Engine

배기계 형상이 과급기를 장착한 4실린더 디젤엔진의 소기성능에 미치는 영향에 관한 연구

  • Published : 2006.05.01


A four-stroke four-cylinder turbocharged diesel engine can be fitted with various types exhaust system. In this paper, the impacts of exhaust system design on scavenging performance and wave action characteristic during valve overlap are investigated by using one-dimensional gas dynamic code. This work shows that a huge reflected exhaust pressure waves which reaches the exhaust port during valve overlap period is crucial design factor which determines quality and quantity of the fresh charge. Hence pressure wave that reaches the exhaust port of the cylinder during the valve overlap sequence should be weakened for good scavenging performance. This paper describes advantages and disadvantages of the various exhaust systems applied to a turbocharged and intercooled 4-cylinder diesel engine system in terms of scavenging efficiency and engine performance. To verify the computational results, experimental comparison has also performed.



  1. F. Trence, F. Bizjan and A. Hribernik, 'Influence of the Exhaust System on Performance of a 4-Cylinder Supercharged Engine,' Journal of Engineering for Gas Turbines and Power, Vol.120, pp.855-860, 1998 https://doi.org/10.1115/1.2818478
  2. F. Trence, F. Bizjan and A. Hribernik, 'Influence of the Exhaust System Design on Scavenging Characteristic and Emissions of a Four-Cylinder Supercharged Engine,' Transactions of ASME, Vol.122, pp.556-561, 2000
  3. S.-J. Jeong, T. H. Kim, B. S. Kim and J. H. Cho, 'A Study on the Effect of Exhaust Manifold Configuration on Engine Performance in a 4 Cylinder, 4 cycle Gasoline Engine,' Transactions of KSME, Vol.18, No.3, pp.751-767, 1994
  4. R. S. Benson, 'The Thermodynamics and Gas Dynamics of Internal-Combustion Engines,' Volume I, Oxford University Press, Oxford, 1982
  5. F. Payri, J. Benajes and M. Meyes, 'Modelling of Supercharger Turbines in Internal Combustion Engines,' Int. J. Mech. Sci., Vol.38, Nos.8-9, pp.853-869, 1996 https://doi.org/10.1016/0020-7403(95)00105-0
  6. Boost Users' Guide Ver. 4.0.4, AVL, 2004
  7. H. O. Hardenberg and F. W. Hase, 'An Empirical Formula for Computing the Pressure Rise Delay of a Fuel from its Cetane Number and from the Relevant Parameters of Direct Injection Diesel Engines,' SAE 790493, 1979
  8. G. Woschni, 'A Universally Applicable Equation for the Instantaneous Heat Transfer Coefficient in the Internal Combustion Engine,' SAE 670931, 1967
  9. K. O. Cha, J. S. Lee and H. S. Kim, 'A Study on the Characteristics of Pressure Wave Propagation in Automotive Exhaust System,' Transactions of KSAE, Vol.4, No.4, pp.18-26, 1996