Abstract
Nowadays, increasingly stricter regulations on emission reduction are inducing rapid developments in combustion science. Low-temperature combustion (LTC) is an advanced combustion technology that increases an engine’s thermal efficiency and even provides low emissions of nitrogen oxides (NOx) and particulate matter (PM). The technology often uses early direct injections to achieve sufficient mixture homogeneity. This leads to increasing wall wetting and lower combustion efficiency. This paper introduces the Multipulse ballistic injection (MBI) method to improve combustion with early injection timings. The research was carried out in a four-cylinder medium-duty diesel engine with high-pressure exhaust gas recirculation (HP-EGR). The investigation was divided into two experiments. In the first experiment, MBI was examined without EGR, and in the second, EGR was applied to study its effects. It was found that the MBI strategy decreased wall wetting and increased homogeneity and the indicated mean effective pressure (IMEP) at early injection angles.
Highlights
In this paper we investigate a new method named Multipulse ballistic injection (MBI), which improves the combustion when early direct injection is used
In these series of measurements, the effects of MBI are investigated without Exhaust Gas Recirculation (EGR)
Investigating the heat release curves, it is clearly visible that green and the purple MBI curves are much higher than the blue single injection curve, even at cent4erofo1f9 injection (CoI) close to TDCF
Summary
The local fuel-rich zones are reduced, which leads to a reduction in PM emission. Due to the application of the lean homogeneous mixture, the number of the local hotpoints are reduced, NOx emission decreases. The combustion products have high heat capacity, increasing the amount of residual gas leads to lower mean combustion temperature and lower NOx emission [3]. The amount of heat escaping with the exhaust gas is lower due to the lower exhaust gas temperature [4]. These are the main reasons for high efficiency
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