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Study on effects of LPG addition and EGR application on the combustion and emission characteristics in a dual-fuel diesel engine
1
Faculty of Mechanical Engineering and Ship Technology, Gdansk University of Technology, Poland
Submission date: 2025-05-26
Final revision date: 2025-10-27
Acceptance date: 2025-10-31
Online publication date: 2025-11-22
Corresponding author
Denys Stepanenko
Faculty of Mechanical Engineering and Ship Technology, Gdansk University of Technology, ul. Gabriela Narutowicza 11/12, 80-233, Gdańsk, Poland
Faculty of Mechanical Engineering and Ship Technology, Gdansk University of Technology, ul. Gabriela Narutowicza 11/12, 80-233, Gdańsk, Poland
KEYWORDS
TOPICS
ABSTRACT
The purpose of this study is to analyze the combustion and exhaust emission characteristics of a four-cylinder dual-fuel diesel engine (AJM 1.9 TDI), operating with diesel as the base fuel and LPG as a premixed, port-injected complement. The engine was modified suitably to run on the dual-fuel mode with few modifications, without altering the original diesel fuel supply system, engine electronic control logic and operation algorithms, nor any other factory-installed components. Experiments were conducted under two conditions: with and without Exhaust Gas Recirculation system (EGR-on and EGR-off). Under each EGR condition, multiple speed/load scenarios were evaluated while replacing diesel with LPG with a share from 0 to approximately 30 % of the total fuel energy. Throughout the experimental runs, in-cylinder pressure (p) data and emissions of NOₓ, CO, CO₂, O₂, and lambda (λ) were logged. Based on the collected data, the combustion metrics such as gross mean effective pressure (GMEP), mean in-cylinder temperature (T) traces, net heat release rate (NHRR) profiles, mass fraction burn (MFB) profiles, burn rate (BR) dynamics, crank angle timings (ϕMFB10, ϕMFB50, ϕMFB90) at key MFB stages, combustion duration (CD) and crank angle timing (ϕp.max) of the maximum in-cylinder pressure (pmax) were computed and evaluated.
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