Abstract
The present study focuses on the experimental investigation on the effect of fuel injection strategies on LTC with gasoline on a single-cylinder CI engine. Firstly, the engine performance and emissions have been explored by sweeping SOI1 and split percentage for the load of 0.9 MPa IMEP at an engine speed of 1500 rpm. Then, the double-injection strategy has been tested for load expansion compared with single-injection. The results indicate that, with the fixed CA50, the peak HRR is reduced by advancing SOI1 and increasing split percentage gradually. Higher indicated thermal efficiency, as well as lower MPRR and COV, can be achieved simultaneously with later SOI1 and higher split percentage. As split percentage increases,NOXemission decreases but soot emission increases. CO and THC emissions are increased by earlier SOI1, resulting in a slight decrease in combustion efficiency. Compared with single-injection, the double-injection strategy enables successful expansion of high-efficiency and clean combustion region, with increasing soot, CO, and THC emissions at high loads and slightly declining combustion efficiency and indicated thermal efficiency, however. MPRR and soot emission are considered to be the predominant constraints to the load expansion of gasoline LTC, and they are related to their trade-off relationship.
Highlights
With great concerns about engine emitted pollutant and global warming issues, alternative combustion concepts are drawing increasing attention worldwide
With SOI1 fixed at −30∘crank angle (CA) after top dead center (ATDC), the combustion reaction occurs at an earlier stage, which leads to a slight decrease in peak heat release rate (HRR), as well as a longer combustion duration
(1) With the fixed combustion phase of 50% accumulative heat release (CA50), the peak HRR is reduced by advancing SOI1 and increasing split percentage
Summary
With great concerns about engine emitted pollutant and global warming issues, alternative combustion concepts are drawing increasing attention worldwide. The concepts applied to compression ignition (CI) engines mainly consist of homogeneous charge compression ignition (HCCI) [1], premixed charge compression ignition (PCCI) [2], low temperature combustion (LTC) [3], and so forth They all share the feature of achieving lower temperature combustion together with a lean mixture distribution by allowing extra time from end of the injection to start of the combustion (SOC), thereby yielding the simultaneous ultra-low nitrogen oxides (NOX) and particle matter (PM) emissions, which are greatly challenged in conventional CI engines. It is suggested that a less reactive fuel is preferred for combustion control at high engine loads In the former studies, mixture of gasoline and diesel termed as dieseline. The current research will be served as a theoretical evidence for the operation range expansion of high-efficiency and clean combustion in CI engines
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