Periodische und statistische Eigenschaften kohärenter Kurzzeit-Strukturen in Tankflammen

摘要: Coherent structures of pool flames are visualized by the synchronous holographic interferometry. – There large coherent which have periodical properties and small both with statistical properties. The phenomena can be classified into three types instabilities. first type is a low-frequency instability frequencies order 12 Hz (for n-hexan flame, d = 4.6 cm) depends considerably on diameter. second third in 300 500 Hz, depend mainly fuel type. indicate that turbulent exchange coefficients for heat matter values six times larger than momentum. Prandtl numbers, Schmidt numbers Lewis functions distance from surface. These vary between following limits: