Computational analysis of injection and spraying in HCCI engine

The paper considers exhaust gases emission indices as the most important characteristics of internal combustion engines in the current engine building industry. It presents a new engine operating principle, Z-engine, which combines the main advantages of both two-stroke and four-stroke engines. The paper contains descriptions of both the Z-engine gas exchange characteristics and its indicator diagram. The authors used the Diesel-RK software package for simulating the operational process of the two-cylinder Z-engine with a spark ignition of the fuel-air mixture. The article shows that this type of engine allows homogenous air-fuel mixing - the HCCI process, as well as it highlights the necessity of simulating the processes of fuel injection and spaying. The ANSYS Fluent 14 software package allows simulating both a fuel flow through the air-gas channel of the delay nozzle used in the Z-engine and a formation of fuel jets with drop evaporation inside the cylinder. The article confirms that the analyzed engine provides the homogenous air-fuel mixing. The authors specify the arrangements necessary to implement the HCCI process in the Z-engine.

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