Fuel-air mixing process of low pressure direct injection in a side ported rotary engine

Year 2019, Volume: 8 Issue: 4, 186 - 194, 10.12.2019

Ozgur Oguz Taskıran

https://doi.org/10.18245/ijaet.608961

Cited By: 3

Abstract

Stratification is seen as a prominent technique
for improving the performance of spark ignition engines especially at part
loads. Though rotary engines have high specific power, they suffer high fuel
consumption and HC emission. For this reason, direct injection methods in
rotary engines have been investigated since they were introduced to the market.
In this study, early direct injection in a side ported rotary engine was
investigated by using CFD techniques. The aim of the study is to obtain the
potential of low pressure direct injection method on mixture formation process.
Geometrical model of Mazda Renesis engine that were modified as a single rotor
engine for research activities was used in the modeling studies. Fuel was
injected directly to the chamber from present oil hole location that has less
geometrical constraints than any other location of the Renesis engine.
Simulations were done for 2000 rpm which is a typical part load operation point
of the engine. In numerical calculations, RNG k-ε model was used as the
turbulence model; spray breakup was modeled by the Taylor Analogy Breakup (TAB)
model. Flow pattern of intake air and fuel droplet distributions were
investigated for a possibility of having rich mixture around spark plugs. The
results showed that swirl-like motion of the side ported engine inhibits fuel
spray to accumulate in the middle of the combustion chamber. Fuel droplets were
driven to the counter side of the inlet wall by centrifugal force of the inlet
air. This effect reduced as the swirl flow diminishes due to sweeping motion of
the rotor. It is observed that the main flow in the chamber is converted to the
tumble-like flow at middle and last part of the compression stroke.

Keywords

rotary engine, direct injection, stratification, CFD, engine modeling

Supporting Institution

Turkish Scientific and Technical Research Council

Project Number

115M690

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