Доступ предоставлен для: Guest
TSFP DL Home Архив Исполнительный Комитет

LARGE EDDY SIMULATION OF LIFTED NON-PREMIXED JET FLAMES USING 2-SCALAR FLAMELET MODEL

Mikikane Hirohata
Future Project Division, Higashifuji Technical Center, Toyota Motor Corporation 1200 Misyuku, Susono-city, Sizuoka, 410-1107, Japan

Toshio Kobayashi
The 2nd Department, Institute of Industrial Science, University of Tokyo 4-6-1, Komaba, Meguro-ku, Tokyo 153-8505, Japan

Nobuyuki Taniguchi
Information Technology Center, University of Tokyo Yayoi, Bunkyo-ku, Tokyo 113-8658, Japan

Аннотация

In this paper we introduce the LES of lifted non-premixed jet flames based on two-scalar flamelet modeling. The flamelet G-equation for premixed combustion and the conserved scalar equation for non-premixed combustion are combined to express partially premixed flame propagation. In order to close filtered G-equation, the subgrid burning velocity model is proposed based on the concept that small triple flamelet are projected into unburnt gas from the flame-base of the lifted non-premixed flame. The calculation results are shown that wrinkling lifted flames are simulated and the difference of the lift-off height and the flame-shape with the variation of the co-flowing velocity is predicted. It is also confirmed that the conditional axial velocity near the flame base is on the order of two - three times of the laminar burning velocity, which agrees well with the experimental data.