The Effect of Knock on Heat Loss in Homogeneous Charge Compression Ignition Engines

2002-01-0108

03/04/2002

Event
SAE 2002 World Congress & Exhibition
Authors Abstract
Content
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.
Meta TagsDetails
DOI
https://doi.org/10.4271/2002-01-0108
Pages
19
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.
Additional Details
Publisher
Published
Mar 4, 2002
Product Code
2002-01-0108
Content Type
Technical Paper
Language
English