Simulating Combustion: Simulation of combustion and by Günter P. Merker, Christian Schwarz, Rüdiger Teichmann

By Günter P. Merker, Christian Schwarz, Rüdiger Teichmann

The content material spans from uncomplicated thermodynamics of the combustion engine to advanced types for the outline of the air/fuel mix, ignition, combustion and pollutant formation contemplating the engine outer edge of petrol and diesel engines. hence the emphasis of the e-book is at the simulation types and the way they're acceptable for the improvement of recent combustion engines. pcs can be utilized because the engineers testbench following the principles and proposals defined right here.

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Pragmatically, we select q* = q supplied c p T1 for this. With this, we first obtain η th, p = 1 − · cv (T4 − T1 ) 1 § T4 ¨ =1− − 1¸¸ . c p T1 q * κ q * ¨© T1 ¹ And finally after a few conversions η th, p = 1 − 1 κ q* κ ª§ q * º · «¨ ¸ + − 1» . 49) The thermal efficiency profile of the constant-pressure process in contingency on ε and q * is represented in Fig. 18. 1 0 0 1 2 4 6 8 10 12 Compression ratio e 14 16 18 20 Fig. 18: Thermal efficiency of the constant-pressure cycle • The Seiliger cycle The Seiliger cycle, demonstrated in Fig.

29: Classification of charging methods Under the concept of external charging we categorize the externally driven charge-air compressor in one-cylinder engines and the scavenging fan in large 2-stroke engines. e. the reciprocating engine is linked with the flow machine "turbocharger" only fluid-mechanically, see Fig. 30. Compressor / Turbine p1 p6 nC = nT · High flow rate · Low pressure ratio p5 p2 . mexh . mair p4cyl p1cyl · Low flow rate · High pressure ratio nM Engine Fig. 30: Reciprocating engine and turbo-machine.

Because of the high air ratios, the temperature of the compressed air is clearly higher than the autoignition temperature of the fuel, and after the so-called ignition lag time (see chapter 4) autoignition begins. In contrast to the SI engine, no homogeneous mixture can form in the short time between injection start and autoignition: injection, mixture formation, and combustion therefore proceed in partial simultaneity. The regulation of the diesel engine ensues with the amount of injected fuel, one thus refers to a quality regulation.

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