微小燃料噴流群により形成される浮き上がり火炎の保炎性の計測

抄録

Methane was issued from six nozzles with an inner diameter of 0.7 mm placed at each vertex of a regular hexagon to establish a lifted flame, of which flame holding characteristics were investigated. It was found that the lifted flames on the burner of six-nozzle with nozzle pitch from 8 mm to 14 mm, where the lifted flame was held on the center axis of six fuel jets, were more difficult to blow-off than a single nozzle burner. In the burners with nozzle pitch from 4 to 14 mm, the burner with nozzle pitch of 10 mm was the most difficult to blow-off and stably held in a relatively wide range of exit flow velocity, from 20 to 170 m/s.