Studies on the burning of levitated magnesium particles in CO2
36th AIAA Aerospace Sciences Meeting and Exhibit, 1998, Nevada, Amerika Birleşik Devletleri, 12 - 15 Ocak 1998, (Tam Metin Bildiri)
- Yayın Türü: Bildiri / Tam Metin Bildiri
- Doi Numarası: 10.2514/6.1998-1026
- Basıldığı Şehir: Nevada
- Basıldığı Ülke: Amerika Birleşik Devletleri
- Orta Doğu Teknik Üniversitesi Adresli: Evet
Özet
An experimental setup with an electrodynamic levitator inside a high pressure chamber is employed. Heat-up to the ignition point of the particles is obtained with a CO2 laser. In the present work, experiments were conducted at ambient temperature over the range of pressures from 0.1 to 2 MPa. The paper considers ignition and combustion of small (50-100 |0,m) single particles of magnesium and aluminum in the atmosphere of carbon dioxide or its mixtures with argon. Effects of the CO2 concentration and pressure on the critical ignition conditions, ignition delay times and burning times have been determined for Mg particles. The results indicate clearly that ignition of Mg in CO2 is controlled by chemical kinetics, and that its combustion is controlled by diffusion in gas phase. The measured values of the burning rate correlate well with previous experimental results on combustion of 2-mm particles and with a quasi-steady model of Mg particle burning in CO2.