| 冯钟辉,周磊,刘培林,等.不同预燃室结构对甲烷湍流射流点火燃烧的影响[J].内燃机工程,2021,42(5):29-35. |
| Effect of turbulent jet ignition based on different pre-chamber structures on the combustion characteristics for methane fuel |
| DOI：10.13949/j.cnki.nrjgc.2021.05.005 |
| Key Words:Methane Turbulent Jet Ignition(TJI) Multi-stage accelerated pre-chamber Flame velocity Ignition mechanism |
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| Abstract:The combustion characteristics of methane fuel under different pre-chamber structures, including flame propagation velocity, flame area, flame morphology and combustion pressure, were quantitatively analyzed by high-speed photogrammetry based on the constant volume combustion bomb. The results showed that smaller aperture can lead to larger penetrations within the same time, as well as higher peak pressure, faster flame velocity, and larger flame area growth rate. As the aperture become smaller enough, the ignition mechanism will change from flame ignition (with flame in the jet) to jet ignition (flame quenches when passing through the orifice). In the case of jet ignition, ignition timing is delayed and initial flame velocity is also slowed down, while the peak pressure is almost unaffected. Similar peak pressures and pressure rise rates were observed in all pre-chamber structures, though the exit velocity in multi-stage pre-chambers was lower. The slower velocity deceleration in multi-stage pre-chambers made the flame advances that in other single-stage pre-chambers in a short time. Meanwhile, the pressure and the flame area reached its maximum value earlier. |
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