Combustion Modeling Lab at UC Berkeley

Current Research

Automation of reduced chemical mechanism development by the Computer Assisted Reduction Method (CARM)

Yulin Chen (CML)


The Computer Assisted Reduction Method (CARM) developed by Professor Jyh-Yuan Chen's research group is a package for automatically reducing chemical kinetic models involving the graph-based (DRG-based and DRGEP-based) methods, Target Search Algorithm (TSA), Quasi-Steady-State-Assumption (QSSA) approach, etc.

The current research is to develop automatic chemical kinetic model reduction schemes for engine combustion simulation with high accuracy and efficiency. The improved aspects involve: 1) definition of pairwise species relation, graph search algirithms, number of sampled detailed chemistry information, target conditions and target searched species in graph-based methods; 2) automatically retain flame speed related chemistry together with ignition delay targets by combining a flame speed sensitivity analysis with other improved reduction schemes. Then development of skeletal and reduced chemical kinetic models is implemented for wide ranges of transportation fuels regarding both ignition delay and flame speed targets at engine operating conditions.

Engine combustion modesAn improved automated reduction methodology for both laminar flame and auto-ignition.

Related papers

Y. Chen, J.Y. Chen, "Towards improved automatic chemical kinetic model reduction regarding ignition delays and flame speeds." Combustion and Flame 190(2018), pp 293-301.

Y. Chen, J.Y. Chen, "Application of Jacobian defined direct interaction coefficient in DRGEP-based chemical mechanism reduction methods using different graph search algorithms." Combustion and Flame 174(2016), pp 77-84.

Y. Chen, B. Wolk, M. Mehl, W.K. Cheng, J.Y. Chen, R.W. Dibble, "Development of a reduced chemical mechanism targeted for a 5-component gasoline surrogate: A case study on the heat release nature in a GCI engine." Combustion and Flame 178(2017), pp 268-276.

Y. Chen, M. Mehl, Y. Xie, J.Y. Chen, "Improved skeletal reduction on multiple gasoline-ethanol surrogates using a Jacobian-aided DRGEP approach under gasoline compression ignition (GCI) engine conditions." Fuel 210(2017), pp 617-624.

E. Hu, Y. Chen, Z. Zhang, J.Y. Chen, Z. Huang, "Ab initio calculation and kinetic modeling study of diethyl ether ignition with application toward a skeletal mechanism for CI engine modeling." Fuel 209(2017), pp 509-520.