Mathematical Modelling Comparison of a Reciprocating, a Szorenyi Rotary, and a Wankel Rotary Engine

Luis F Espinosa,Petros Lappas

doi:10.1515/nleng-2017-0082

Luis F Espinosa, Petros Lappas

Open Access

https://doi.org/10.1515/nleng-2017-0082

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Abstract

Abstract This paper provides an explanation of the geometry, design, and operational principles for the three engines; having special emphasis in the Szorenyi rotary engine which has a deforming rhombus revolving inside a mathematically defined stator. A basic ideal mathematical simulation of those engines were performed, assuming the Otto cycle for the three engines. Also, it assumes the volumetric efficiency of 100%, a wide-open throttle (WOT), no knock nor any mechanical or thermal losses. This simulation focuses on how the fuel burns during combustion, creating pressure and thus, net work. A comparison in pressure traces and cycle performance is made. The study concludes analysing and comparing the ignition advance; finding the best advance for each engine thus the net work between the three engines during one working cycle. Finally, this paper analyses how the different volume change ratio for the combustion chamber of the Szorenyi, Wankel and the reciprocating engine have an effect in the pressure, net work and thermal efficiency generated inside the chamber during combustion for every working cycle.

Highlights

IntroductionRotary engines have seen many di erent designs over the years
This paper provides an explanation of the geometry, design, and operational principles for the three engines; having special emphasis in the Szorenyi rotary engine which has a deforming rhombus revolving inside a mathematically de ned stator
This paper explores the potential of the Szorenyi engine compared to the exiting Wankel rotary engine and the reciprocating engine

Summary

Introduction

Rotary engines have seen many di erent designs over the years. Reciprocating engines consist of a piston inside a cylinder to create variable pressure and volume [3]. Rotary engines are a middle step between reciprocating engines and turbines. Rotary engines form ‘a plurality of variable volume chambers’ between a rotor and the outer part known as the stator [4]. Rotary engines have several disadvantages as higher fuel consumption and emissions. They are a less fuel exible engine, with sealing, lifespan, compression ratio disadvantages and longer ame travel path and other combustion e ects that makes the combustion unstable [5,6,7,8]

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