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Influence of the mixture composition on the conversion degree of catalytic converter during power supply of the engine with natural gas

Worsztynowicz B.

Journal of Polish CIMAC

2013

Vol. 8, no 2

99--106

The article tackles with a topic of emission of hazardous components of exhaust gases into the atmosphere and a conversion degree of catalytic converter while supplying the combustion engine with natural gas. The natural gas is an example of alternative fuel for fossil fuel characterized by low weight carbon participation. The supply of combustion engines with gas fuel is realized in one- or two-fuel systems. The results of measurements were presented performed on the post of engine braking stand, in the conditions for preparing loading characteristics for the engine with spark ignition. The parameter which was changed, was the composition of the combustible mixture. On the basis of the measurements, the analysis of influence of combustible mixture was presented onto the contents of hazardous components in exhaust gases as well as efficiency of catalytic operation.

Control of the air excess coefficient for the non-conventional engine

Hlavňa V., Sojčák D., Isteník R.

Journal of KONES

2006

Vol. 13, No. 2

117-124

One of the elements significant for the testing of combustion engines is the equipment for measurement of air consumed by the engine. The air excess coefficient, which depends on air consumption, is an important variable required for classification of combustion processes and evaluation for engine gas emissions. The paper deals with the solution of a flow field of a designed non-standardized measuring element with the objective of measurements and control of the air excess coefficient of the non-conventional combustion engine. In particular test stand (combustion engine – absorptive cooling equipmen)t, measuring element of the suction section of the combustion engine, modeling of the boundary layer, distribution of velocities and pressure field, distribution of density and temperatures in the flow field, course of static pressure and velocity in the measuring element axis for the engine torque, velocity profiles in cross sections, regulation of y+ parameter, comparison of velocities in dependence on torque, comparison of mass flow and pressure difference, contour of kinetic turbulent energy m2.s-2 for standardized and non-standardized measuring element, search dependence are presented in the paper.