Experimental Investigation on the Performance of Desuperheater in Power Plant
Desuperheater is an important equipment in power plant. In desuperheater, spray nozzle is the key component forits advantages of full contact and seldom blockage. In this study, a nozzle atomization test system is built and different nozzle water total pressures and wind speeds are chosen under the condition of Room-temperature to test the atomization characteristics of the target spray nozzle in high-speed airflow. The experimental results are compared with the theoretical results. The conclusion shows the SMD distribution range after second atomization at We ranging from 20 to 50. Under the laboratory conditions, when the nozzle exit caliber is 3mm and impingement angle is 60¡ã, it can be seen that the SMD reaches its minimum value under the certain water pressure. This study provides a useful reference for the target spray nozzle atomization technology.
Formation of thin flat sheets of water
A thin plane sheet of fluid which is limited laterally and converges towards a point transforms itself into a sheet which diverges in a perpendicular plane. When the angle of convergence is small and the distribution of thickness in the converging sheet is elliptic the diverging sheet has the same shape as the converging sheet. Apparatus for producing such a sheet was set up and the shape of the stream and distribution of pressure in the region of the transformation were measured and compared with calculations.
Venus: Evolution of the Upper Atmospheric Clouds
Abstract The large number of UV photographs taken by different observatories throughout the world are grouped for analysis at the IAU Planetary Photograph Center of Meudon Observatory. Three horizontal V, Y, or psi-shaped dark-hued cloud features are usually aligned along the equator and move 110 m s−1 westward in a planetary-wide rotation. The more intense and distinctly V-Shaped features last several weeks. The smaller scale cloud structures usually show significant changes after each successive rotation in 4 days around the planet. The average UV contrast is 32% but can fluctuate from disappearance to 37%. For periods of several years, the polar areas are sometimes covered by a white cloud. According to a set of photographs taken at Pic-du-Midi, this never occurred between 1962 and 1966 but has happened during 25% of the time for at least one pole since 1967, and only when the planet was in a given half of its orbit. These polar clouds are ephemeral and usually last several weeks or months; they evolve...