Paper 11: Computing the Gas Exchange Process of Pressure Charged Internal Combustion Engines

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Abstract
Numerous problems associated with pressure charging can only be solved numerically by analysing the gas exchange process. The extensive practical application of step by step calculations of the process has only become possible with the advent of digital computers. For fundamental investigations the data provided by quasi-steady-state calculations are quite adequate, the amount of computing time being only a fraction of that needed for calculations in which allowance is made for non-linear wave phenomena. The Turbocharger Department of Brown Boveri utilizes a digital computer for calculations involving the gas exchange process in conjunction with its consulting activity for the benefit of customers. The program can be adapted to solve a very wide range of problems. The procedure is briefly described and possible applications discussed with reference to the following practical examples. Optimization of valve timing. Assessment of the results from various aspects. Performance and design for high pressure turbocharging and for high-altitude installations. Two-stage turbocharging. Mixture control for dual-fuel and gas engines.

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