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Flame Development of Combustion in Otto Engines
Technical Paper
785037
Sector:
Language:
German
Abstract
The significance of flame development in the process of energy
conversion in Otto engines has not been well explained. The study
investigates through photographic means the relationship between
pressure values and flame development.
Tests were run on a Daimler-Benz four-stroke Otto engine. Engine
modification for incorporation of photographic equipment is
described; testing procedure and engine operation are presented.
Flame propagation was photographed between 60° before and 150°
after top dead center. Evaluation methods and test limitations are
discussed.
Results show that the visible aspects of flame propagation are
highly dependent on engine operation. This dependency is strong
enough that energy conversion may be charted in the combustion
chamber either by photographic means or by conventional pressure
measurements. However, relatively high costs, difficulty of the
testing procedure, and testing limitations make this process
generally impractical.