APPLICATION OF PREDICTIVE COMBUSTION MODEL TO CI ICE BASED ON LES AND CHEMICAL KINETICS
Keywords:
LES, CFD, CHEMICAL KINETICS, COMPRESSION IGNITION, SIMULATION, NOX FORMATION, IGNITION DELAYAbstract
The paper deals with 3-D CFD modeling of CI ICE while using LES approach combined with chemical kinetics. Detailed CFD model of single-cylinder research CI engine was built. As LES approach has high predictive ability, it needs limited calibration when compared with RANS. In this particular case, only LES spray sub-model was calibrated using dedicated data from ‘cold’ pressure vessel test rig. Another critical step when using LES approach is to have a correct computational mesh resolution. Global heat transfer scaling factor was fine-tuned as well. Sensitivity studies were carried out to make the final selection of these parameters. After that, 4 different engine operating points were calculated – these represent different load levels while there is a variation of EGR as well. Concerning applied chemistry, simple mechanism based on n-heptane containing 34 species and 64 reactions was used. Predicted data were compared versus measured/reference data representing average cycle. Good performance of applied simulation setup was stated – this mainly concerns the predictive ability in terms of rate of heat release and NOx formation. Certain shortcomings were identified – they need addressing, which is planned as near-future steps.
Článek se zabývá 3-D CFD modelováním vznětového spalovacího motoru za použití LES přístupu v kombinaci s chemickou kinetikou. Byl vytvořen podrobný CFD model jednoválcového výzkumného vznětového motoru. Protože LES přístup vykazuje velkou prediktivní schopnost, nutnost kalibrace je nižší ve srovnání s RANS přístupem. V tomto konkrétním případě jen LES model paprsku paliva byl kalibrován s využitím dat ze „studené“ tlakové komory. Dalším kritickým krokem při použití LES je použití správné výpočetní sítě z hlediska jejího rozlišení. Také globální násobitel pro přestup tepla byl mírně doladěn. Pro finální výběr těchto parametrů byly provedeny citlivostní studie. Poté byly propočteny 4 různé pracovní body motoru – ty reprezentují různé úrovně zatížení s tím, že se mění i hodnota vnější recirkulace výfukových plynů. Co se týká použité chemie, byl použit jednoduchý mechanismus založený na n-heptanu, který obsahuje 34 složek a 64 reakcí. Vypočtená data byla porovnána s experimentálními/referenčními daty, která odpovídají průměrnému cyklu. Bylo konstatováno, že použitá konfigurace výpočtu vykazuje dobré parametry – to se týká hlavně schopnosti predikovat rychlost vývinu tepla a tvorbu NOx. Byly identifikovány určité nedostatky, které je nutné řešit, což je plánováno pro nejbližší budoucnost.
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