analysis of internal combustion

7/29/2019 ANALYSIS OF INTERNAL COMBUSTION

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ANALYSIS OF INTERNAL COMBUSTION ENGINE WITH A NEWCONCEPT OF POROUS MEDIUM COMBUSTION FOR

THE FUTURE CLEAN ENGINE

THERMAL SCIENCE: Year 2010, Vol. 14, No. 4, pp. 943-956


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ANALYSIS OF INTERNAL COMBUSTION ENGINE WITH A NEWCONCEPT OF POROUS MEDIUM COMBUSTION FORTHE FUTURE CLEAN ENGINE

At present, the emissions of internal combustion engine can only beimproved by catalytic treatments of the exhaust gases.

Such treatments, how ever, result in high costs and relatively lowconversion efficiency.

This suggests that a new combustion technique should be developed toyield improved primary combustion processes inside the engine withdrastically reduced exhaust gas emissions


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Dr. Franz Drust has proposed a new combustion concept toPerform homogenous combustion in internal combustion engines.

This concept used theporous medium combustion techniqueand is called PM-engine. It is shown that the PM combustiontechnique can be applied to internal combustion engines.



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Porous medium technology

The PM technology for IC engine means the utilization of specific features

of a highly PM for supporting and controlling the mixture formation and

combustion processes in IC engines. The employed specific features of PM

are directly related to a very effective heat transfer and very fast flame

propagation within the PM.


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Most important features of PM are:

High heat capacity

Large specific surface area

Excellent heat transport property (radiation and conductivity)

Transparency for fluid flow and flame propagation

Variable pores size, pores density and pores structure

High thermal and mechanical resistance

Thermal shock resistance


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Figure : View of SiC foam structure (left); Reconstructed structure using

computer tomography (right)


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The PM engine may be classified with respect to the heat recuperation as:

engine with periodic contact between PM and working gas in a cylinder (closedchamber)


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Engine with permanent contact between PM and working gas in cylinder (open chamber).


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View of PM engine head with SiC reactor


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Experimental set-up and experimental results

Photograph shows the complete experimental set-up on which theactual Research work is carried out. The set-up consists of a Dieselengine having technical specifications as :

Single cylinder, four stroke, high speed direct injection dieselengine, water cooled, Bore 80 mm, stroke 110 mm, 5 HP andcompression ratio 16:1.

Experimental reading on above engine is taken and performance ofthe engine is recorded by calculating various parameters like

efficiency, fuel consumption, plotting P-V, T-Sdiagrams, andrecording soot formation initially with out PM, and the same readingswith porous medium


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Cup head piston of dieselengine fitted with porousmaterial disc in cup shape


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RESULT

The results of the experiment carried out on the engine with the PM iscompared with the normal engine and it is found that the efficiency of theengine has improved, exhaust emissions like NOx, CO, and UHC are

reduced drastically and also it has been recorded that the soot formation isalmost negligible

Conclusion

A porous medium technology has been defined as a utilization oflarge specific surface area, large heat capacity, high porosity, etc. of

open cell structures for supporting different processes realized inengine. Especially important is the application of this material forhomogenous mixture formation and complete combustion inengines.


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analysis of internal combustion

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