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The pre-ignition is very challenging for modern gasoline engines with high pressure boost and gasoline direct injection (GDI) system. Except optical imaging method, effective pre-ignition diagnostic methods are very limited. This paper presents the recent research in the feasibility of using ion current for pre-ignition diagnosis. In agreement with the theory of the ion current based pre-ignition...
Lifted flames of gaseous ethanol and dimethyl ether (DME) issuing into a hot co-flow are recorded with a high-speed camera. The flames of the two fuels at 433K are studied in a co-flow temperature range from 966K to 1149K and at an ambient pressure of 1atm. The experimental results show that the co-flow temperature has a substantial influence on the jet flame characteristics. It is concluded that...
Ion current (IC) is a novel and feasible method for the diagnosis of in-cylinder combustion. The improvement of IC signal quality and reliability is always a challenge before it is applied as a sensor of engine combustion. In this paper, the characteristics of homogeneous charge compression ignition (HCCI) and IC signal with ethanol/gasoline dual fuel have been presented. The results show that increased...
In order to reveal the spray combustion mechanism of blend fuels, a combustion model was established using EDC model based on previous experimental research. The simulation results show that under lower co-flow temperature, the auto-ignition of n-heptane (represent diesel) occurred earlier than gasoline (represent gasoline), as a result of the combined effect of slower vaporization rate and lower...
The three-dimensional structures of carbon deposits on piston surfaces in a large-scale two-stroke marine diesel engine have been nondestructively investigated using synchrotron X-ray microtomography. The results indicate that the piston carbon deposit (PCD) has a flat bottom surface where many irregular structures accumulate. Based on the microtomography, cross sections of the carbon deposit sample...
The lift-off flame of gasoline/diesel blend fuel spray in controllable active thermo-atmosphere (CATA) was captured by a high speed camera to investigate the auto-ignition characteristics of blend fuel, meanwhile a database for further simulation work was provided. The experimental results showed that the influence of co-flow temperature on spray lift-off flame has two opposite trends: Under higher...
The phase-varying mechanism of the ion current observed in a Homogeneous Charge Compression Ignition (HCCI) engine is investigated to achieve ion current-based combustion phasing. By integrating the gasoline flame ionization mechanism with the HCCI combustion model, the mechanisms affecting the ion formation and recombination processes are analyzed, and the relationship between the phases of ion current...
The oxygenated fuels such as dimethoxy methane (DMM), dimethyl carbonate (DMC), dimethyl ether (DME) are regarded as hopeful alternative fuels as well as fuel additive to resolve the trade-off relation between NOx and smoke in normal diesel engine. The better understanding for the effect of oxygenated fuel on the atomization is helpful for the combustion optimization. This paper presents an experimental...
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