Improved model to determine turbine and compressor boundary conditions with the method of characteristics

Method of characteristics is still a powerful tool to incorporate variety of boundaries appearing in the internal combustion engines in the wave action techniques. Striving to the higher accuracy of one-dimensional techniques for modelling of engine manifolds leads to the necessity of considering variable properties and concentration of the gas. Innovative algorithm for the simulation of a turbocharger gas turbine and compressor based on extended equations of the method of characteristics is presented in this paper. This algorithm enables consideration of variable inlet and outlet pressure as well as consideration of variable gas properties and concentration. Improved model assures much better conservation of mass flow rate, when variable gas properties are considered, at only slightly increased computational time.

[1]  T. Poinsot.  Boundary conditions for direct simulations of compressible viscous flows , 1992 .

[2]  P. C. Baruah,et al.  A simulation model including intake and exhaust systems for a single cylinder four-stroke cycle spark ignition engine , 1975 .

[3]  R. S. Benson.  Unsteady Isentropic Flow with Variable Specific Heats , 1956, The Journal of the Royal Aeronautical Society.

[4]  R. S. Benson,et al.  Paper 34: Effects of Variable Specific Heats and Gas Composition on Unsteady Flow Calculations , 1969 .

[5]  Richard Pearson,et al.  Calculating the effects of variations in composition on wave propagation in gases , 1993 .

[6]  Josette Bellan,et al.  Consistent Boundary Conditions for Multicomponent Real Gas Mixtures Based on Characteristic Waves , 2002 .

[7]  Dimitris Assanis,et al.  Manifold Gas Dynamics Modeling and Its Coupling With Single-Cylinder Engine Models Using Simulink , 2003 .

[8]  Yutaka Otobe,et al.  Honda Formula One Turbo-charged V-6 1.5L Engine , 1989 .

[9]  M. Klell,et al.  Thermodynamik der Verbrennungskraftmaschine , 2002 .

[10]  D. E. Winterbone,et al.  The thermodynamics and gas dynamics of internal-combustion engines. Volume II , 1982 .

[11]  Richard Pearson,et al.  A solution of the wave equations using real gases , 1992 .

[12]  G. Guderley.  Nonstationary Gas Flow in Thin Pipes of Variable Cross Section , 1948 .

[13]  D. Thévenin,et al.  Accurate Boundary Conditions for Multicomponent Reactive Flows , 1995 .

[14]  K. Thompson.  Time-dependent boundary conditions for hyperbolic systems, II , 1990 .

[15]  Gordon P. Blair,et al.  Design and Simulation of Two-Stroke Engines , 1996 .

[16]  R. S. Benson,et al.  A numerical solution of unsteady flow problems , 1964 .