The Japan-German joint research program “PHOENIX-2” on the cool flame dynamics using TEXUS sounding rocket is planned and in progress. The reference data of spontaneous ignition of fuel droplet arrays and pairs in hot air and those of succeeding cool flame combustion are to be obtained through the microgravity experiments. The present review introduces the known mechanism of cool flame and the importance of the flame in various practical combustion applications. The recent research revealed the significant scientific needs for reliable modelling of cool flame chemistry, especially for the case of non-uniform field where heat and species dissipate. The droplet combustion system is suited for controlling the dissipative field, and the experimental data are promised to be the reference for the chemical modelling. The scope of the experiments is explained in view of this needs.
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