Abstract
Regarding the purity of cutting oxygen jet, the relation between schlieren photographs and the oxygen purity has been studied experimentally, with the following results.
a: Jet boundary printed on schlieren photographs shows only the supersonic zone of jet and there is none of discontinuities of oxygen purity at the boundary.
b: With the increasing of nozzle inlet pressure Po, the sonic boundary distance Xs increased proportionally to the value of Po and the oxygen purity at Xs decreased.
Some other experiments have been made regarding the effect of preheating flame on cutting oxygen purity with the following result:
c: The oxygen purity was kept at a long distance from nozzle exit with preheating flame as well as the case of oxygen momentum described in the report 2.
