An assessment of nozzles for steam attemperation

作者：van Banning D H C; van der Geld C W M^*; Broos P J C; Strebe M J

来源：Experimental Thermal and Fluid Science, 2014, 55: 86-94.

DOI：10.1016/j.expthermflusci.2014.02.019

• Spray
• Pressure swirl nozzle
• Impaction pin nozzle
• Spring loaded nozzle
• Discharge coefficient
• Drop size distribution

With state of the art optical techniques, the drop velocity, drop size distributions, spray homogeneity and spray constancy of three nozzle types have been measured. Inlet water temperature has been varied up to 85 degrees C. Existing correlations for the exit drop velocity, discharge rate and drop size distributions of various types of pressure swirl nozzles have been examined and adapted for the new data. The resulting expressions are believed to be applicable to this type of atomizers in a general sense. Sprays of spring loaded nozzles are usually both non-uniform and unsteady. The pressure swirl nozzle is found to be robust and at present best suited for steam attemperation. Redesigns of impaction pin nozzles are believed to have potential to prevent wetting of downstream wall area in a wider range of gas flows than with the other nozzle types.

• 出版日期2014-5