Experimental study on knocking combustion in compressionignition engines under high-altitude conditions

Diesel engine combustion becomes very rough or even detonation under high altitude conditions, which is harmful to components durability. In this study, combustion characteristics were experimentally investigated on a V6 heavy-duty diesel engine using by a plateau simulation test bench to simulate a...

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Bibliographic Details
Published in:Journal of physics. Conference series 2020-03, Vol.1507 (3), p.32024
Main Authors: Li, H Y, Zhang, X Q, Qiang, Y P, Zhu, W Q, Li, Y Z, Li, Y F
Format: Article
Language:English
Subjects:
Altitude
Combustion
Detonation
Diesel engines
Engines
Extreme values
High altitude
Knock
Peak pressure
Physics
Pressure oscillations
Spark ignition
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Summary:Diesel engine combustion becomes very rough or even detonation under high altitude conditions, which is harmful to components durability. In this study, combustion characteristics were experimentally investigated on a V6 heavy-duty diesel engine using by a plateau simulation test bench to simulate altitude conditions of 1000 m, 3000 m and 4500 m. Results show that extremely high peak pressure rise rates of above 50bar/°CA exist at low speeds under the altitude of 4500 m. This indicates that not only does knocking combustion exist in spark-ignition (SI) engines, but also can be found in compression-ignition (CI) engines. Knock intensity (KI) is calculated by the pressure oscillation with high-pass filtering (HPF). Approach of cycle to cycle variation was adopted to study combustion characteristics on the comparisons of knock and non-knock states. Also, the correlation between KI and peak pressure rise rate was revealed through the linear regression method.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/1507/3/032024