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Purposefulness of using real gas model in analysis of internal combustoin engine cycle parameters

Przybyła G., Postrzednik S.

Journal of KONES

2006

Vol. 13, No. 3

315-322

This paper includes the purposefulness of using real gas model in thermodynamic analysis of combustion process parameters. Conversion energy optimization in internal combustion engine is possible through well understanding phenomena occurring in combustion chamber. Nowadays the main investigation method of combustion engines is pressure indication. Measurement of pressure in cylinder gives some information about possibility of improving parameters of internal combustion engines work. On the basis of obtained experimental data, applying suitable mathematical model, values of thermodynamic parameters, difficult or impossible to measure, are determined, for example: - course of temperature change in combustion chamber, - rate and course of heat release versus crank angle, - rate and course of fuel charge burning. Calculation results are strongly depended on accepted simplifications in mathematical model. Wide range of temperature and pressure change of working medium within single cycle can require application of real gas state equation. In this situation, determination of compressibility factor of working medium is of primary importance.

Improving of IC engine efficiency through dropping of the charge exchange work

Postrzednik S., Żmudka Z.

Journal of KONES

2004

Vol. 11, No. 3-4

133-144

Normally the charge exchange occurs once during each one engine cycle realized. The main idea prescnted in the paper leads to diminishing of the ICE charge exchange work. Elaborated proposition bases on the elimination of chosen charge exchange processes and through this the dropping of the charge exchange work can be achieved. Work of Internal combustion engines, which are used as the driving source of cars, occurs not only at the full load, but mostly at the part load. In this range the energy efficiency eta - eg. (1) is significant Iower as in the optical (nominal field) stage of the performance parameters. One of the numerous reasons of this state is regular growing of the relative load exchange work of the IC engine. On the base of the experimental results and using the elaborated formulas it has been calculated that the relative charge exchange work can achieve value up to 40 % at the part load (e. g. idle run) of the IC engine. Both of this mentioned problems can be solved using presented in the paper a new concept of the reference cycle (called as eco-cycle) of IC engine. The work of the engine basing on the eco-cycle occurs in two 3-stroke stages; the fresh air is delivered only once for both stages, but in range of each stage a new portion of fuel is burned. The fuel combustion for the whole cycle can be performed at relatively Iow values of air excess lambda > 1. The mostly taken into account criteria for valuation of internat combustion engine refer to its energy efficiency and to emission. Diminishing of emission (gaseous phase and solid particles)from combustion engines can be achieved by realisation of two groups of measures: primary (inside-engine) doings, secondary doings, comprising catalysts and solid particle filters. The proposed solution bases on the possibilities of diminishing of the emission. which is contained in the primary measures. The elaborated eco-cycle leads to the diminishing of the toxic substance emission and to the improving of engine efficiency.