Analysis of Influence of Working Process Features on Effective Characteristics of Aircraft Piston Engines

Main trends of development of aircraft piston engines with spark ignition are discussed which provide the inlet manifold fuel injection (or direct fuel injection into the cylinder), different time moments of spark plug operation, the intensive flow swirl at inlet and also the regulated supercharging. The numerical investigation of working processes and heat exchange in combustion chambers of aircraft piston engines is carried out using the three-dimensional nonstationary equations of energy, motion, diffusion and continuity in Reynolds form with addition of k-e turbulence model. Fuel burning rate is simulated using the commonly approved Magnussen-Hjertager combustion model. The AVL FIRE 3-D code package has been used to obtain the numerical results. As a consequence, the optimal values of constructive (the setting angle of the injector of the fuel supply system, the flow swirl at inlet, the pressure rise degree in the supercharging unit) and regulating (angles ofadvance of ignition and fuel injection) parameters of operation of the engines under study are found out.

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