Phenomenology Investigation Of Thermoacoustic Coupling Mechanism For Combustion Of I.C.E

In this article, a single cylinder SI engine is chosen as the research object. By using the acoustic simulation of combustion chamber and high speed photography, establishing a pressure field model caused by Thermo-acoustic coupling.From the investigation of combustion progress & acoustic field, opening up the Thermoacoustic coupling Mechanism in the combustion progress. It can take new theoretics & technology for simulation and optimization of combustion progress.By developing acoustic theoretics and high speed photography, the acoustic character of combustion chamber is studied in detail. a single cylinder SI engine is chosen as the research object, by analyzing the high speed photography results, the acoustic model of combustion chamber established and its spectrum character is analyzd. With the influence of chamber volume and temperature on acoustic model of combustion chamber.,it is found that the modes of combustion charmber rise up with the chamber temperature.The resonance of charbers'several modes sresults in the frequency oscillation.Combining with high speed photography, study on acoustic field which is stimulated by combustion under transient conditions . using the results of photographical experiment,analyzing the development of combustion and building two parts in chamber. By the characters of two parts of chamber,establishing time model. By computing the pressure response stimulated by one point or some points under transient conditions, studying on the pressure field's character under transition condition.The results show that the pressure oscillation can cause disequilibrium in chamber. In Thermo-acoustic coupling Mechanism, the oscillation caused by combustion can affect combustion progress by turn.