Objective
The objective of this research project is to carry out a detailed analysis of the effect of liquid fuels on the combustion in the final phase of the combustion cycle, to propose ways for improvement and to evaluate the potential for an improved energy efficiency and for a reduction of unburned hydrocarbon emissions.
In a first phase the required experimental facilities were developed and set up. A square piston engine with full optical access by four windows was redesigned to accept an additional window in the cylinder head. Furthermore mechanical and electronical injection systems were installed on the engine to allow for direct comparisons of engine operation with gaseous or liquid fuels, respectively.
Advanced diagnostic tools, based on optical principles, were adapted for nonintrusive investigation of the flow field, mixing and combustion processes. Laser and Phase Doppler anemometry were used to measure time resolved flow field and particle data. Two different Particle Image Velocimetry systems were set up, one using a single shot and the other a high speed filming technique. Both systems have special hard-and software configurations offering high spatial and temporal resolution.
Measurements of fuel distribution and fuel air mixing in the square piston engine were accomplished by laser induced fluorescence techniques using optimized tracer materials. A fast IR-absorption technique was used to measure unburned hydrocarbon emissions from crevice volumes and wall layers.
Engine measurements were performed for a gaseous and liquid fuel, monitoring engine efficiency and UHC emissions. Results are compared to numerical prediction using an advanced CFD code with a combustion model.
For numerical simulation a 3D cold flow code was adapted to the combustion chamber geometry of the square piston engine and to inflow data as initial conditons for the computer code. Special submodels for mixing and combustion were developed and included. The complete verified 3D CFD code is now available for detailed investigations on realistic engine geometries.
During the first two phases, theoretical and experimental research carried out in parallel lead to a substantially improved understanding of cold flow, mixing phenomena and combustion processes in spark ignition engines when operated on liquid fuels.
The project is based on the results of the preceding programme (contract EN3E-0056-D). Improved Otto-cycle by enhancing the final phase of combustion. It extends the new insights gained on gaseous mixtures to the case of liquid fuels, which is more close to practical technical utilization.
Work will be focused on mixing processes and time dependent effects controlling engine combustion (local strain, rate of change in pressure and volume). These will be assessed theoretically and experimentally by our new methods for cycle and crank angle resolved length and time scale characterization of turbulent engine combustion and by the BML flamelet model.
The project will continue basic R&D on non-stationary turbulent combustion at high pressures by developing multidimensional techniques for numerical modelling, non-intrusive diagnostics and specific experimental setups for single cycle analysis.
It is planned to maintain and expand the scientific and technological lead in fundamental combustion processes in engines achieved in the transnational european cooperation between industrial and other outstanding research facilities. A strong link has been established with the nationally funded German TECFLAM programme.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- engineering and technology environmental engineering energy and fuels liquid fuels
- engineering and technology environmental engineering ecosystem-based management climatic change mitigation
- natural sciences chemical sciences organic chemistry hydrocarbons
- natural sciences mathematics pure mathematics geometry
- natural sciences physical sciences optics laser physics
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Programme(s)
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Topic(s)
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Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
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Funding Scheme
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Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Coordinator
70567 Stuttgart
Germany
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.