公开(公告)号：JPH10110912A

公开(公告)日：1998-04-28

申请号：JP26603697

申请日：1997-09-30

Applicant: ABB RESEARCH LTD

Inventor： KNOEPFEL HANS PETER ,  BOLIS GIACOMO

IPC: F23D14/02 ,  F23C7/00 ,  F23D11/40 ,  F23D17/00

Abstract: PROBLEM TO BE SOLVED: To enable recirculating zone to act at a plane region of a cross section jumping part by a method wherein a mixing pipe to which recirculation is carried out by a swirling flow is connected at a downstream side of an indoor section, its mixing pipe is moved to a combustion chamber trough the cross section jumping part and the cross section jumping part is formed by a front wall. SOLUTION: A swirling flow 23 composed of air/fuel mixture flows into a mixing pipe 21 connected to a flowing-out side of a swirling flow generating device 10 without forming any inverse flow region so as to perform a predetermined mixing operation. In addition, a front surface wall 25 having a plurality of openings is arranged at an end surface side to face toward a combustion chamber, wherein an amount of air is directly flowed into an edge region at a cross section jumping part. At the region of the cross section jumping part, voltex collapse caused by the swirling flow lower than a critical state formed at this location is formed and then an recirculating zone 32 is induced. Ignition is carried out at the extremity end of the recirculating zone 32. That is, a stable flame front is formed only at this location.