NUMERICAL AND EXPERIMENTAL INVESTIGATIONS OF SUPERSONIC JETS FROM SOOTBLOWER NOZZLE

The present paper describes the numerical as well as the experimental study on the axisymmetric supersonic jet associated with a sootblower nozzle for boiler cleaning. The Navier-Stokes equations are solved num erically, and the experimental work is also performed with the low-den sity wind tunnel. Calculations and experiments both cover the region f rom the nozzle exit to the downstream distance of 20 times the nozzle exit diameter. The effect of the nozzle divergence angle is discussed by comparing the experiments with calculations, and it is pointed out that, even when the expansion ratio across the nozzle is correct, the regular shock-cell structure appears in the jet for the nozzles with f inite divergence angles. Also, the present numerical results on the im pact pressures along the jet center-line agree favorably well with tho se reported by the other researchers.