DEPENDENCE OF CHARACTERISTICS OF HEAT EXCHANGE FROM MIXTURE OF MIXTURE ON DRY WALK IN ENGINE WORKING ON GAS FUEL
Keywords:
compressed natural gas, hydrogen, combustion process, heat dissipation characteristic, internal combustion engine, dry walkAbstract
The idling mode for spark-ignition engines is characteristic, a significant uneven flow of the
combustion process. Which is due to the fact that a fresh combustible mixture is strongly diluted
with residual gases. The characteristics of flammability are largely determined by the preceding
combustion cycle. The studies consisted of bench tests on the VAZ-2111 engine at idle and thermodynamic analysis of three successive indicator diagrams, obtained experimentally, reflecting
the cycle before ignition was missed, a cycle witha pass and a cycle after ignition was missed.
As a result of the thermodynamic analysis, the characteristics of the change in the work and
the internal energy of the cycle for each interval of the indicator chart of one degree of rotation of
the crankshaft are determined. On the basis of this, the characteristic of active heat release was
obtained for all the investigated cycles. The presented results of the thermodynamic analysis of
the combustion process make it possible to estimatewith more accuracy the effect of the composition of gas fuel on the heat release characteristic, since the analysis of the change in internal
energy was carried out according to the author's technique, allowing its evaluation without determining the temperature and the quantity of the working fluid, which, with strong throttling, are
practically unknown parameters. The results obtained showed the effect of the composition of
the gas fuel and ignition misfire on the active heat release, and the efficiency of improving the
stability of combustion for the economy of the engine. In this connection, the work is devoted to
the analysis of the heat dissipation characteristics in experimental studies of new alternative gas
fuels consisting of natural gas and hydrogen, which will allow us to better understand and quickly
move to the design stage of new engines with increased efficiency of the combustion process at
idle. This is certainly an important task, as modern trends in reducing the toxicity of automotive
ICEs make it necessary to switch to gas fuels.
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