Studies on the break-up regimes of Lox droplets
37th Aerospace Sciences Meeting and Exhibit, 1999, Nevada, Amerika Birleşik Devletleri, 11 - 14 Ocak 1999, (Tam Metin Bildiri)
- Yayın Türü: Bildiri / Tam Metin Bildiri
- Basıldığı Şehir: Nevada
- Basıldığı Ülke: Amerika Birleşik Devletleri
- Orta Doğu Teknik Üniversitesi Adresli: Evet
Özet
An experimental system has been developed to investigate droplet-jet interaction regimes under various flow and thermodynamic conditions. Liquid oxygen single droplets are vertically injected into the potential core region of a horizontal and cylindrical jet. The high pressure chamber developed for this investigation allows high pressure (up to 12 MPa) to be explored, therefore: reducing the ρi/ρg ratio to low values never reached before. The droplet Weber and Reynolds numbers are systematically varied. Two component laser Doppler anemometry and particle image velocimetry determines flow and turbulence characteristics of the jet. Four droplet interaction regimes are observed, and quantified by rapid video imaging and numerical, image analysis. The transitions between regimes are correctly predicted by correlation using the Weber and Reynolds numbers and the density and viscosity ratio. The influence of surface tension is clearly underlined. The different characteristic times are determined. Under high pressure and close to supercritical conditions, a strong reduction of the droplet break-up initiation times is observed.