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.
Atomization by jet impact
The formation and fragmentation of liquid sheets resulting from the oblique collision of two identical cylindrical jets is investigated. The liquid expands radially from the impacting point forming a sheet in the form of a bay leaf bounded by a thicker rim. The sheet shape, rim size and liquid velocity field are quantified and represented analytically. External harmonic perturbations of the injection conditions reveal the nature of the rim destabilization and of its coupling with the sheet. Flow perturbations in the incident jets lead to sheet thickness modulations which trigger the fragmentation of the rim via the formation of liquid ligaments whose dynamics is described. The breakup of these ligaments induce both the shape and width of the drop size distribution in the spray formed by this process.
Variations common to the interplanetary magnetic field, the zonal atmospheric circulation and the earth's rotation
A study of the cyclic fluctuations in the earth's rotation, the geomagnetic field, the global atmospheric circulation and solar activity reveals the existence of 50-day and 120-day oscillations common to all. Our results, as well as the results obtained by radiometric measurements from the satellites Nimbus-7 and the Solar Maximum Mission (Wilson 1982; Pap 1985), suggest that their origin lies in the physical processes in the sun. The mechanism remains unexplained but from this work it follows that the role of the interplanetary magnetic field could very well be important.