Experimental Investigation of Combustion Performance of U-Type Flame Holder

The combustion performance of a U-type flame holder has been experimentally investigated and compared with that of V-type and double V-type flame holders.The combustion-experimental results show that the ignition performance of V-type and U-type flame holders is better than that of the double V-type flame holder under ad hoc case of fuel supplying,and the combustion efficiency of the U-type flame holder is the highest among these flame holders.Furthermore,it is shown that the proposed flame holder of U-type has successfully improved the disadvantage of double V-type flame holder under the circumstance of fuel supplied in the upstream of flame holder,and has the advantages of both other flame holders.The cold-state test results show that the flows in the flame stability tube of U-type are typical three-dimensional and have stronger recirculating zone and low velocity zone in downstream of flame holder than that of double V-type flame holder.It is the reason why the combustion performances of double V-type flame holder are ameliorated by the U-type.