A Study of Gas Exchange Process Simulation of an Automotive Multi-Cylinder Internal Combustion Engine

Takizawa, Miasaaki; Uno, Tatsuo; Oue, Toshiaki; Yura, Tadayoshi

doi:10.4271/820410

Cited by 43 publications

(12 citation statements)

References 2 publications

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“…However, the method of characteristics presents two major drawbacks-first-order accuracy ͑O(⌬x, ⌬t)), which derives from linear interpolation between grid points in the space domain, and the smearing of shocks in discontinuous solutions. In the last decade there have been some convincing examples of application of finite difference shockcapturing schemes, such as the FRAM 20 and the Lax-Wendroff methods, [21][22][23] to the calculation of unsteady flows in engine ducts, replacing the traditional mesh method of characteristics with more accurate and robust techniques. Following this strategy, efficient and robust finite-difference shock capturing schemes have been recently included in the simulation model, for the solution of the hyperbolic problem in conservation form.…”

Section: A Numerical Methodsmentioning

confidence: 99%

Nonlinear fluid dynamic modeling of reactive silencers involving extended inlet/outlet and perforated ducts

Onorati

1997

noise cont engng j

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A numerical simulation model has been developed to predict the attenuation features of silencers in the frequency domain. The model is fully nonlinear, solving the conservation equations for one-dimensional, unsteady, compressible flow in duct systems. The numerical techniques adopted are the MacCormack and the Lax-Wendroff shock-capturing finite difference schemes, and the mesh method of characteristics. The numerical code is able to simulate the gasdynamic response of a muffling pipe system to a harmonic pressure perturbation, enabling the evaluation of the transfer function of the equivalent acoustic filter. The simulation has been extended to several silencers, resorting to appropriate boundary conditions and acoustically equivalent duct systems. Helmholtz resonators, expansion chambers with internal orifices, extended inlets and outlets, and other more complex silencing duct systems have been modeled, achieving a satisfactory agreement between predicted results and experimental data, measured in a semi-anechoic room. Furthermore, an investigation of perforated pipes has been carried out, following a detailed approach to model plane-wave propagation in the perforate and in the cavity liner. The method suggested takes into account every single hole with its diameter, length, and friction coefficient, allowing for the correct modeling of the reactive and dissipative behavior of the silencer. ©

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Section: A Numerical Methodsmentioning

confidence: 99%

Nonlinear fluid dynamic modeling of reactive silencers involving extended inlet/outlet and perforated ducts

Onorati

1997

noise cont engng j

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“…A similar technique but with a generalized form of the momentum equation was presented by MacLaren et al (10) while Daneshyar and Pearson (11) have developed the method to analyse flow in four-pipe junctions although in this case some simplification was made to reduce the computing time required by the model. Takizawa et a1 (12) have included a modified constant pressure model for manifold junctions in their engine simulation computer program. In this model pressure losses are calculated using a loss coefficient but the method for determining the appropriate value of this coefficient is not given.…”

Section: The M S Was Received On 28 December 1983 and Was Acceptedformentioning

confidence: 99%

An Improved Branched Pipe Model for Multi-Cylinder Automotive Engine Calculations

Bingham¹,

Blair

1985

Proceedings of the Institution of Mechanical Engineers, Part D:

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This paper describes a new mathematical model for calculating the behaviour of unsteady gas Pow in engine manifold junctions of any configuration. The model, which allows for pressure losses at the junction, is arranged for use with engine simulation computer programs in which the gas dynamics analysis is based on the method of characteristics. Experimental coefjicients obtained from steady Pow tests are presented for use with existing momentum theory models and also with the generalized approach. Measured pressure-time histories and performance data for a multi-cylinder engine are compared with computer predictions using three different pipe branch calculations: constant pressure theory, momentum theory and the generalized procedure. This comparison shows the new technique gives correlations which are better than the constant pressure method but without the limitations and complexity of the model based on momentum theory. 8/85 Q IMechE 1985

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“…For instance, the pressure variations along the exhaust manifolds are neglected. But for high-speed engines or pulse turbocharged engines, this approximation is not acceptable because of the pressure wave reflection time [12,23,24] .…”

Section: Introductionmentioning

confidence: 99%

An Implementation of the Method of Characteristics Using ACSL Software

Hétet

Mezencev

1997

SIMULATION

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The simulation of gas flows in a reciprocating engine requires solution of the equations of gas dynamics because of the pressure waves in the manifolds, for example. The method of characteristics provides a means for solving hyperbolic partial differential equations. We propose in this paper a new way to implement this using ACSL software. After presenting an outline of the method of characteristics and ACSL software, we present a program to solve a simple case: a pressurized pipe with a gradually opening valve. The state event mechanism allows the boundary conditions and the intersections of the characteristics emitted from both ends of the pipe to be dealt with precisely while the solution of the differential equations is realized in a continuous fashion.

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A Study of Gas Exchange Process Simulation of an Automotive Multi-Cylinder Internal Combustion Engine

Cited by 43 publications

References 2 publications

Nonlinear fluid dynamic modeling of reactive silencers involving extended inlet/outlet and perforated ducts

Nonlinear fluid dynamic modeling of reactive silencers involving extended inlet/outlet and perforated ducts

An Improved Branched Pipe Model for Multi-Cylinder Automotive Engine Calculations

An Implementation of the Method of Characteristics Using ACSL Software

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