By Carsten Baumgarten
ISBN-10: 3540308350
ISBN-13: 9783540308355
The e-book covers some of the ways to modelling, measuring and optimising the aggregate formation method in inner combustion engines. as a result of their complexity and value in predicting the temporal and spatial distribution of liquid and gaseous gasoline contained in the cylinder, distinctive emphasis is wear the distinctive description of multi-dimensional CFD-models in regards to the movement stipulations contained in the injection nozzle, the first and secondary spray break-up, evaporation, turbulent dispersion, collision, wall impingement and ignition. instance calculations are in comparison with semi-empirical family members and corresponding experimental information - represented in diagrams in addition to in photos due to smooth optical size suggestions - for you to speak about the functions of today’s simulation versions in addition to their shortcomings. in addition, today’s and destiny necessities about the improvement of injection structures in a position to optimising the combustion method by way of diminished gasoline intake and emissions are mentioned. The reader can be supplied with an outline of an important optical size thoughts for the research of combination formation in inner combustion engines.
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Additional info for Mixture Formation in Internal Combustion Engines
Example text
In the case of low wall temperature, under cold starting conditions for instance, the formation of a liquid wall film will significantly increase the unburned hydrocarbon and soot emissions because of partial burning due to the very slow evaporation of the wall film. On the other hand, shattering of droplets at the wall may intensify droplet disintegration and increase the total spray surface. The formation of a large-scale gas vortex near the wall may also promote air entrainment and enhance mixture formation.
8 is a weak function of the physical properties of the liquid and the injection velocity [9]: f b 3 1 exp 10b , 6 2 b § Rel · Ul ¨© We ¸¹ U . 9) For high-pressure sprays and thus increasing values of b, f(b) becomes asymptotically equal to 31/2/6 [44]. However, Kuensberg et al. [31] have shown that in case of high-pressure injection the predicted spray cone angles are underpredicted compared to experimental results. One quantity characterizing the average droplet size of a spray, and thus the success of spray break-up, is the Sauter mean diameter (SMD).
D. Thesis, Max-Planck-Institut für Strömungsforschung, Göttingen, Germany [7] Busch R (2001) Untersuchung von Kavitationsphänomenen in Dieseleinspritzdüsen. D. Thesis, University of Hannover, Germany [8] Chehroudi B, Chen SH, Bracco FV, Onuma Y (1985) On the Intact Core of Full-Cone Sprays. SAE paper 850126 [9] Dan T, Takagishi S, Senda J, Fujimoto H (1997) Organized Structure and Motion on a Diesel Spray. SAE paper 970641 [10] Dent JC (1971) A Basis for the Comparison of Various Experimental Methods for Studying Spray Penetration.
Mixture Formation in Internal Combustion Engines by Carsten Baumgarten
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