Optical Measurement of Wet Steam in Turbines

1998 ◽  
Vol 120 (4) ◽  
pp. 867-871 ◽  
Author(s):  
N. N. Wang ◽  
J. M. Wei ◽  
X. S. Cai ◽  
Z. W. Zhang ◽  
G. Zheng ◽  
...  
Keyword(s):  
Optical Measurement ◽  
Droplet Diameter ◽  
Turbine Blades ◽  
Optical Probe ◽  
Wet Steam ◽  
Full Size ◽  
Power Stations ◽  
Scattering Technique ◽  
The Mean ◽  
Light Scattering Technique

The wetness fraction of steam causes dangerous erosion of turbine blades and other components, and decreases efficiency of stages. The instrumentation of wet steam has, therefore, attracted growing interest from the point of safety and economical operation of power stations. Based on the light scattering technique, a method is presented that is capable of measuring the wetness fraction of steam, the mean water droplet diameter as well as their full size distribution. An optical probe has been constructed that can be used in the turbines in operation. Its main characteristic and features are discussed in this paper. Experimental results in a 200 MW condensing steam turbine are also given.

Spray Characteristics of Plain-Jet Airblast Atomizers

1984 ◽  
Vol 106 (3) ◽  
pp. 634-638 ◽  
Author(s):  
N. K. Rizk ◽  
A. H. Lefebvre
Keyword(s):  
Drop Size ◽  
Air Pressure ◽  
Liquid Viscosity ◽  
Liquid Ratio ◽  
Air Velocity ◽  
Spray Characteristics ◽  
Test Range ◽  
Scattering Technique ◽  
The Mean ◽  
Light Scattering Technique

The effects of air and liquid properties and atomizer dimensions on the spray characteristics of plain-jet airblast atomizers are examined. Mean drop size and drop-size distribution are measured using an improved form of light scattering technique. The test range includes wide variations in air velocity, air pressure, air/liquid ratio, and liquid viscosity. The experimental data generally confirm the results of previous studies on prefilming types of airblast atomizers. They show that increases in air velocity, air pressure, and air/liquid ratio all tend to produce a more uniform spray and a lower mean drop size. It is also observed that any change in air properties, liquid properties, and atomizer geometry that lowers the mean drop size also produces a more uniform distribution of drop sizes in the spray.

scholarly journals Spray Characteristics of Plain-Jet Airblast Atomizers

1983 ◽  
Author(s):  
N. K. Rizk ◽  
A. H. Lefebvre
Keyword(s):  
Drop Size ◽  
Air Pressure ◽  
Liquid Viscosity ◽  
Liquid Ratio ◽  
Air Velocity ◽  
Spray Characteristics ◽  
Test Range ◽  
Scattering Technique ◽  
The Mean ◽  
Light Scattering Technique

The effects of air and liquid properties, and atomizer dimensions, on the spray characteristics of plain-jet airblast atomizers are examined. Mean drop size and drop-size distribution are measured using an improved form of light scattering technique. The test range includes wide variations in air velocity, air pressure, air/liquid ratio, and liquid viscosity. The experimental data generally confirm the results of previous studies on prefilming types of airblast atomizers. They show that increases in air velocity, air pressure and air/liquid ratio all tend to produce a more uniform spray and a lower mean drop size. It is also observed that any change in air properties, liquid properties and atomizer geometry that lowers the mean drop size also produces a more uniform distribution of drop sizes in the spray.

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