Experimental Analysis of the Influence of a Compressed Natural Gas (CNG) - Air Mixer on Performance and Emissions in Partial Load CNG-Diesel Dual Fuel Engines

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The shipping industry is one of the contributors to global emissions that has received particular
attention due to the increasing demand for maritime transportation services. The use of natural
gas is considered a potential solution due to its relatively clean nature, abundant availability,
and competitive pricing. The CNG-Diesel Dual Fuel Engine design is developed with the
principle of using natural gas as an alternative fuel without replacing the existing diesel
engine. Minimal modifications are made to the intake manifold to accommodate CNG entry.
Despite its advantages, the development of dual fuel engines faces challenges, such as
increased methane emissions due to the potential for incomplete combustion. This study
conducts experimental research on the influence of mixer and non-mixer utilization in the
intake manifold on the performance and emissions of a diesel-CNG dual fuel engine."Testing
the mixer's influence is carried out under various CNG injection durations at low and high
engine loads at constant speeds. The results indicate that the addition of the mixer does not
immediately improve combustion quality or reduce emissions. Attention to conditioning the
homogenous mixture at the required air-fuel ratio before entering the combustion chamber is
crucial. The selection of the appropriate mixer design, diameter size, and placement of holes
needs careful consideration.