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| Optical Investigation of Knock in a Highly Boosted Gasoline Engine |
| DOI：10.13949/j.cnki.nrjgc.2019.04.002 |
| Key Words:highly boosted gasoline engine auto-ignition knock optical engine |
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| Abstract:Knocking was studied on a boosted single cylinder optical gasoline engine. The auto ignition and extreme-knock development processes have been captured in a wider view with the adjustment of engine operating parameters and high-speed imaging technology. The combination of the recorded images and in-cylinder pressure data has provided the information for understanding the origins of the auto-ignition and the huge pressure oscillation magnitude of super-knock. The results show that the pressure oscillation and flame image of the light knock caused by the auto-ignition of unburned end gas are remarkably different from those of the extreme-knock caused by pre-ignition. The development modes of auto-ignition play an important role in the in-cylinder pressure oscillation magnitude, causing auto ignition kernels to get close to but in direct contact with the cylinder walls, therefore surface ignition can be ruled out. Auto-ignition kernels can generate flame propagation, which is restricted by the main flame and cylinder walls. |
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