Knock in a Rotax-914 engine was modeled and investigated using an improved version of the KIVA-3V code with a G-equation combustion model, together with a reduced chemical kinetics model. The ERC-PRF mechanism with 47 species and 132 reactions [1] was adopted to model the end gas auto-ignition in front of the flame front. The model was validated by a Caterpillar SI engine and a Rotax-914 engine in different operating conditions. The simulation results agree well with available experimental results. A new engineering quantified knock criterion based on chemical mechanism was then proposed. Hydroperoxyl radical (HO2) shows obvious accumulation before auto-ignition and a sudden decrease after auto-ignition. These properties are considered to be a good capability for HO2 to investigate engine knock problems. The results of engine simulations show that HO2, as a criterion based on chemical mechanism, can give more detailed information of what is happening in the process of knock and the knock propensity in non-knock case. These capabilities make HO2 a very efficient tool for future knock research.
Modeling Investigation of Auto-ignition and Engine Knock by HO2
Sae Technical Papers
SAE 2014 World Congress & Exhibition ; 2014
2014-04-01
Conference paper
English
Modeling investigation of auto-ignition and engine knock by HO2
Automotive engineering | 2014
|Modeling Investigation of Auto-ignition and Engine Knock by HO~2
British Library Conference Proceedings | 2014
|Modeling autoignition and engine knock under spark ignition conditions
Automotive engineering | 2003
|Understanding Knock Metric for Controlled Auto-Ignition Engines
SAE Technical Papers | 2013
|Understanding Knock Metric for Controlled Auto-Ignition Engines
British Library Conference Proceedings | 2013
|