https://radar.brookes.ac.uk/radar/file/31621c10-5991-422f-9256-e976fdda2e19/1/tan2016developments.pdf

Developments in computational fluid dynamics modelling of gasoline direct injection engine combustion and soot emission with chemical kinetic modelling

Experimental and numerical study on the adoption of split injection strategies to improve air-butanol mixture formation in a DISI optical engine

Numerical simulation of gasoline and n-butanol combustion in an optically accessible research engine

A RANS-Based CFD Model to Predict the Statistical Occurrence of Knock in Spark-Ignition Engines

Numerical Simulation of Gasoline and n-Butanol Combustion in an Optically Accessible Research Engine

CFD Analysis of the Effects of Fuel Composition and Injection Strategy on Mixture Preparation and Fuel Deposit Formation in a GDI Engine

Optical measurements of the flame propagation inside an engine provide essential information for combustion process development. Many published studies in this field of research focus on low load and low speed engine operating points, as the utilized measurement techniques do not provide full load capability. Future emission legislations will include real driving emissions (RDE). As a consequence, there is a strong need for optimization of the full load range considering power and pollutant output.

Investigation of flame development applying optical metrology in a highly boosted SIDI performance engine for the sports car market

This paper presents the modeling of the transient phase of catalyst heating on a high-performance turbocharged spark ignition engine with the aim to accurately predict the exhaust thermal energy available at the catalyst inlet and to provide a "virtual test rig" to assess different design and calibration options.The entire transient phase, starting from the engine cranking until the catalyst warm-up is completed, was taken into account in the simulation, and the model was validated using a wide data-set of experimental tests.The first step of the modeling activity was the combustion analysis during the transient phase: the burn rate was evaluated on the basis of experimental in-cylinder pressure data, considering both cycle-to-cycle and cylinder-to-cylinder variations.Then, as far as the exhaust temperatures are concerned, a detailed model of the thermocouples was implemented to replicate the physical behavior of the sensors during the warm-up and to compare the simulated temperatures with the measured ones.Finally, a complete analysis of the energy balance during the transient was carried out: the thermal power available to the catalyst inlet was obtained from a complete analysis of power losses (i.e. friction and pumping losses, in-cylinder heat transfer, engine block and engine coolant heating, exhaust manifold heat transfer, etc.).In conclusion, the proposed methodology allows to reliably simulate in details the Cat-Heating transient, showing a valuable potential in driving the main design and calibration choices during the engine development process.

Francesco Pulvirenti

Papers

CFD Analysis of the Effects of Fuel Composition and Injection Strategy on Mixture Preparation and Fuel Deposit Formation in a GDI Engine

Investigation of flame development applying optical metrology in a highly boosted SIDI performance engine for the sports car market

A Methodology for Modeling the Cat-Heating Transient Phase in a Turbocharged Direct Injection Spark Ignition Engine