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The Effect of Knock on Heat Loss in Homogeneous Charge Compression Ignition Engines
Technical Paper
2002-01-0108
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
One of the problems in HCCI combustion is a knocking in higher load conditions. It governs the high load limit, and it is suggested that the knock increases heat loss[1], because it breaks the thermal boundary layer. But it is not clear how much knock affects on heat loss in the HCCI combustion in various conditions, such as ignition timing and load. The motivation of this study is to clarify the ratio of heat loss caused by knock in HCCI engines.
The heat loss from zero-dimensional calculations with modified heat transfer coefficient, which is considering the effect of knock by adding a term of cylinder pressure rising rate dp/dt, agreed well with the results from the thermodynamic analysis in various conditions. And the results show that it is possible to avoid heat loss by knock by controlling the ignition timing at appropriate timing after T.D.C. and it will be possible to expand the load range if knock can be avoided.
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Citation
Tsurushima, T., Kunishima, E., Asaumi, Y., Aoyagi, Y. et al., "The Effect of Knock on Heat Loss in Homogeneous Charge Compression Ignition Engines," SAE Technical Paper 2002-01-0108, 2002, https://doi.org/10.4271/2002-01-0108.Also In
Homogeneous Charge Compression Ignition (Hcci) Combustion 2002
Number: SP-1688; Published: 2002-03-04
Number: SP-1688; Published: 2002-03-04
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