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| Experimental Investigation on the Effect of Turbulent Jet Ignition on the Combustion Characteristics of Natural Gas Engine |
| DOI：10.13949/j.cnki.nrjgc.2021.06.006 |
| Key Words:turbulent jet ignition(TJI) combustion characteristic lean combustion natural gas engine |
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| Abstract:Based on a spark ignition(SI) single-cylinder engine with a pre-chamber, an experimental investigation about the performances of nature gas engine was carried out in turbulent jet ignition(TJI) mode. The effects of TJI on the power performance, emissions and combustion characteristics of natural gas engine under different excess air coefficients were studied and compared with the results using the traditional spark ignition method. Then, the optimization effects of intake boosting and pre-chamber fueled with hydrogen on engine performance were carefully investigated under lean conditions. The results show that the TJI can effectively extend the lean combustion limit of natural gas engine with the decrease of ignition delay time and combustion duration as well as the high heat release rate. It can be found that the optimum lean combustion condition using TJI method was the excess air coefficient of 1.5, with which the lowest fuel consumption rate and near-zero nitrogen oxide emission can be achieved. Furthermore, using intake boosting can improve the economy of the TJI engine under high loads. As for TJI combustion mode, compared with the results using pre chamber fueled with methane, the pre-chamber fueled with hydrogen can further reduce the ignition delay time and combustion duration, and improve the heat release rate, which further improves the performance of TJI combustion. |
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