During the engine prototype design period the performance predictions are the key subject of the development. For the piston reciprocating engines a wide spectrum of the analytical approaches was developed as well as the numerical software (GT-Suite, Ricardo Wave etc.) is being used often. The increasing demand for the high-power output engines with a low displacement and weight for the UAV and marine applications, makes Wankel rotary engine a sensible option. The commercially available software for the performance prediction does not include required algorithms for the rotary engine calculation. This paper provides an approach to be used in the simulation model setup as well as the comparison of the simulation outcome with the measured data.
The rotary engine of the Wankel type is currently undergoing a renaissance in the combustion engine industry, mainly because of the simplicity of its design and high power to weight ratio. Strong reliability increases the demand in the aero industry where it is used mainly in small aircrafts such as drones. In the engine development process, there is a high demand for 1 dimensional (1D) simulation software which reduces the time of the development. The commercially available software provides a possibility of predicting the performance of the piston-reciprocating engine to a very high level of accuracy given initial conditions. As the demand for the rotary engines isn't comparable to the piston-reciprocating engines, currently commercially available software doesn't include the required equations for the rotary engine prediction calculations. This paper includes an approach for design of the virtual comparable piston engine, that can be used as an initial data source for the calculation of the rotary engine using commercially available software.
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