**7. Nomenclature**

*CV* <sup>1</sup> − specific heat of agent at constant volume in the initial point of combustion process,[kJ/ kgK]

*CV* <sup>2</sup> − specific heat of agent at constant volume in the end of combustion process, [kJ/kgK]

*T*<sup>2</sup> − charge temperature at the begining of the combustion process, [K] *Tm* − maximal tem‐ perature of the cycle, [K]

*RW* − crank arm,[m]

**Figure 31.** Relation of specific fuel consumption and total efficiency in function of engine rotational speed for 3/4

**1.** The methods presented in this study, of determining the comparative cycle for this fuel supply system may be applied to the initial calculations in the designing of the gasoline

**2.** The determination of the best parameters for the fuel injection process requires the ac‐ curate setting of the time the fuel spout requires to travel the distance from the injector

**3.** The results obtained during the visualization of the process of injection and combustion of the luminar loads display the actual conditions occurring inside the engine cylinder and they become essential in the accurate determination of the parameters deciding

**4.** A considerable increase in the total efficiency of the gasoline engine is observed during the combustion of lean fuel-air mixtures, due to lower temperatures during the load creation process, which allows applying larger values of the compression ratio to 14,

rated power

**6. Conclusions**

engine with direct petrol injection,

114 Advances in Internal Combustion Engines and Fuel Technologies

exit to the spark plug electrodes.

about the correct course of the gasodynamic phenomena.

which directly translates to the increase of the total efficiency.

*L <sup>p</sup>* − actually mass demand of air for combustion of 1 kg of fuel, [kmol/kg]

*L <sup>S</sup>* − distance between the piston top and the head, [mm]

*γ* − coefficient of pollution of the fresh charge with rests of exhaust gases

*x* − the distance of the piston from the TDC,[m]

*α* − actual angle of revolution of the crankshaft,[deg]

*ω* − angular velocity,[rad/s]

*θ* − angle of combustion start,[m]

*φ<sup>Z</sup>* − total angle of combustion,[m]

*m*− Vibe's exponent, (m=3.5)

*λ* − crank radius to connecting-rod length ratio

constans

*s* − distance traveled by the fuel stream,[m]

*t*1−<sup>5</sup> − times in sectors, [s]

*tinj* − time of injection, [s]


[8] Sendyka B., Cygnar M.: "Numerical model describing the injection and combustion process in SI engine" .International Conference ATTE – Congress & Exhibition, Bar‐

Stratified Charge Combustion in a Spark-Ignition Engine With Direct Injection System

http://dx.doi.org/10.5772/53971

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[9] Sendyka B., Cygnar M.: "Analysis of the behaviour of the stratified charge in a gaso‐ line direct injection engine". International Conference KONMOT-AUTOPROGRES,

[10] Spectral Flame Temperature Measurement Using the two Colour Method. AVL List

[11] Zhao F.Q., Lai M.C., Harrington D.L., "A Review of Mixture Preparation and Com‐ bustion Control Strategies for Spark-Ignited Direct-Injection Gasoline Engines"SAE

celona 2001

Poland 2002

2000, USA

Gmbh, Graz, 2009

