Joint International Conference on Long-term Experiments ...

The calculation of engines with spark lighting parameter, was sectioned in 10
proceedings and functions. Near the declared constant values at the beginning of the
program, it is considered as initial dates, presumed to be lanown choosing arbitrary
from the statistical dates of engines with spark lighting cycle: Tao=322 K; Tzo=2530 K;
Tuo =2660 K and kco =1,3; kvo =1,3; kuo =1,2; kdo=1,3; keo=1,3; without them are not
possible to calculate in general way all others coefficients and the other temperature and
the physical seize which characterize the cycle. In this way the seize above will play the
parameter role, variable will the temperature in which thermal process evaluate. These
temperatures depend on the adiabatic coefficients which in fact are stability by going
though many times of the cycle until these coefficients become constant with 0,000009
error.
This exit decision from the cycle for a certain revolution is given by the diminish of the
constant error of temperature Ta under 1,5 K.
The calculation of algorithm is made up of the following steps:
1) The initial parameter relation Tao, Tzo, Tuo şi kco, kvo, kuo, kdo, keo for one revolution.
2) The cycle is going through, obtaining new values for k coefficients and Ta, Tz, Tu
temperatures.
3) It is made differences between old and new calculated values (∆k, ∆T).
4) If the differences between (∆k, ∆T) are lower than the imposed error, then the new
calculated values are valid and they are going to the next revolution value and 1-4
points are repeated.
5) If the differences (∆k, ∆T) are above the imposed errors then the cycle is going
through by the recalculation of the adiabatic coefficient values and temperature,
considered new value as initial parameter. This re-going through is realized until
the descend of the differences (∆k, ∆T) under the imposed errors.
This program calculate the characteristic seize of one thermodynamic cycle in general
way only with the restriction of the energetic efficiency of burning ηar and the using
coefficient of warmth during the burning stage at a constant volume ξo, which define as
a performant middle of study.
CONCLUSIONS
The engines with spark lighting modeling cycle with the gasoline injection proposed by
the author consist of the presentation of the initial dates of the calculation program,
calculation and the correlation between the engines with spark lighting parameter
expression with the gasoline injection for the achievement of the program calculation.
The engines with spark lighting cycle calculation proposed, with gasoline injection is an
helping cycle for the simulation on the calculator of the gasoline injection. The
simulation on the calculator permit the determination of the theoretical economicaltehnical
parameters proposed; mechanical work theoretical proposed corresponding to
the diagram, theoretical pressure proposed, theoretical efficiency, theoretical specific
consumption proposed. The loosing mechanical pressure and the pumping are
calculated, the theoretical economical-tehnical parameters of the engine.
Using the proposed model by the author the volume of the fuel is calculated which
reset of the engine cycle in function with the revolution of the total load, the debit of the
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