2011 Fiscal Year Final Research Report

Elucidation study of combustion dynamism of three-dimensionally dispersed fuel system through experiments in microgravity environment

Research Project

Project/Area Number	21360419
Research Category	Grant-in-Aid for Scientific Research (B)
Allocation Type	Single-year Grants
Section	一般
Research Field	Aerospace engineering
Research Institution	Osaka Prefecture University
Principal Investigator	SEGAWA Daisuke 大阪府立大学, 大学院・工学研究科, 教授 (00264804)
Project Period (FY)	2009 – 2011
Keywords	推進・エンジン / 液体燃料 / 噴霧燃焼 / 群燃焼 / 非定常蒸発
Research Abstract	Fuel droplet clusters in which the droplets were arranged to form nearly spherical outer shape were actually produced as the three-dimensionally dispersed fuel systems, and the experiments of evaporation, autoignition and combustion, of those clusters were conducted where the clusters were quickly introduced into hot air ambience. The behaviors and the characteristic time periods of the evaporation, autoignition and combustion as well as the flame shapes were measured and examined through optical observation. We focused our attention especially on the cases for finer droplets and for polydisperse droplets, and those effects were examined. As the results, the knowledge and values concerning the scale effects were accumulated, and moreover, it was confirmed for the first time that the situations where the autoignition occurred after the part of the droplets were disappeared(evaporated) were reproduced.