A literature review of fuel effects on performance and emission characteristics of low-temperature combustion strategies

Effect of equivalence ratio on combustion and emissions of a dual-fuel natural gas engine ignited with diesel

The optical investigation of hydrogen enrichment effects on combustion and soot emission characteristics of CNG/diesel dual-fuel engine

Comparative study of pilot fuel property and intake air boost on combustion and performance in the CNG dual-fuel engine

Experimental study of using additive in the pilot fuel on the performance and emission trade-offs in the diesel/CNG (methane emulated)dual-fuel combustion mode

Emissions and performance of diesel-natural gas dual-fuel engine operated with stoichiometric mixture

Diesel fuel injection process calculations have been performed by means of in-house developed mathematical models. An Eulerian multidimensional code for in-cylinder two-phase flow computations is used in conjunction with a hydrodynamic one-dimensional model of a fuel injection system. The multidimensional model comprehends all basic processes, which play a role in spray formation. The compressible gaseous flow with transport of species is solved together with the flow of dispersed liquid phase using the Eulerian reference frame for both phases. The two-way coupling between the phases in mass, momentum, and energy balances is considered. A detailed description of liquid phase is present, taking into account drop size distribution in terms of the multi-continua approach. The hydrodynamic model capable of simulating common fuel injection systems is used for the rate-ofinjection computations to provide realistic boundary conditions to the spray model. The results of computations of fuel spray evolution are presented for an engine of simplified geometry equipped with the Common-Rail injection system. Different rate-of-injection shapes are computed, with single and multiple injection events, and their influence on fuel spray formation is shown. The combination of 3-D and Q-D models is outlined, which provides possibilities to enhance the spray model by simplified diesel combustion simulation and to calibrate model closure parameters.

Fuel Injection Process Computations Using the Eulerian Multidimensional Model

Eulerian Multidimensional Model for Computing the Fuel Sprays

The contribution reviews the research activities on modeling the fuel spray formation in combustion chamber of Diesel engines. A fully Eulerian code has been developed for computing the two-phase flows of drops dispersed in gaseous environment. Both the multi-component compressible gas and the drops are described using governing equations written in Eulerian coordinates. The basic laws of conservation are balanced on finite volumes with arbitrary movable boundaries. This facilitates the modeling of movable boundary problems (e.g. computations with moving engine piston). The model features full coupling between both phases in mass, momentum, and energy equations. The drop size distribution in sprays is taken into account using the multi-continua approach. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

Marcel Diviš

Papers

Emissions and performance of diesel-natural gas dual-fuel engine operated with stoichiometric mixture

Fuel Injection Process Computations Using the Eulerian Multidimensional Model

Eulerian Multidimensional Model for Computing the Fuel Sprays

Eulerian Model of Diesel Fuel Sprays