简介:The ignition characteristics of a premixed bluff-body burner under lean conditions were
investigated experimentally and numerically with a physical model focusing on ignition
probability. Visualisation of the flame wit简介:The ignition characteristics of a premixed bluff-body burner under lean conditions were
investigated experimentally and numerically with a physical model focusing on ignition
probability. Visualisation of the flame with a 5 kHz OH* chemiluminescence camera
confirmed that successful ignitions were those associated with the movement of the
kernel upstream, consistent with previous work on non-premixed systems. Performing
many separate ignition trials at the same spark position and flow conditions resulted
in a quantification of the ignition probability Pign, which was found to decrease with
increasing distance downstream of the bluff body and a decrease in equivalence ratio.
Flows corresponding to flames close to the blow-off limit could not be ignited, although
such flames were stable if reached from a richer already ignited condition. 详细>