tailieunhanh - Internal Combustion Engines Fundamentals Episode 1 part 12

Tham khảo tài liệu 'internal combustion engines fundamentals episode 1 part 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 412 INTERNAL COMBUSTION ENGINE FUNDAMENTALS from experiments at equivalent motored The turbulence quantity obtained during motoring experiments was the ensemble-averaged root mean square velocity fluctuation defined by Eq. . Values determined at two points in the combustion process at the end of the flame development process and at mass ofSfc SL a flame fraction and u f Sl radius of 30 mm burned equal to halfway through the rapid burning phase . To correct the motored turbu- lence data for the higher pressure levels corresponding to engine firing conditions a simple rapid distortion model see Sec. based on conservation of angular momentum in turbulent eddies was used. A linear correlation between sb and u F results as shown in Fig. 9-30 for the rapid burning combustion phase. Note that as u F SL goes to zero Sh SL approaches a value close to unity. Once the flame front reaches the far cylinder wall see Fig. 9-27 the front can no longer propagate however combustion continues behind the front until all the unbumed mixture entrained into the enflamed region is consumed. This final burning or termination phase of the combustion process can be approximated by an exponential decay in the mass burning rate with a characteristic time constant of order 1 ms. Since these islands or pockets of unburned mixture behind the leading edge of the flame have a characteristic scale lT based on the laminar flame area Eqs. and it follows that lr xb SL In summary the above flame data analysis procedures show that the relationships between rf and rb Vf and vb Af and AL Uj- sb and SL are distinctly different in the three phases of combustion 1 the development phase where a highly wrinkled reaction-sheet thick -overall turbulent flame evolves from the essentially spherical flame kemal established by the spark discharge 2 the rapid-burning phase where this thick developed turbulent flame propagates across the combustion chamber to the far wall .

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