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.
Effects of reservoir volume on performance of pulse tube cooler.
A pulse tube cooler has the advantages of long-life and low-vibration over conventional cryocoolers such as G-M and Stirling coolers because of the absence of moving parts at low temperature. On the other hand, the combination of a reservoir and orifice is indispensable to optimize the performance of pulse tube coolers. In order to make the pulse tube cooler compact for practical applications, the volume of reservoir should be minimized. This paper analyzes the effects of the reservoir volume on the thermodynamic performance of various components in a simple orifice and a double-inlet pulse tube cooler by combining a linearized model with a thermodynamic analysis. Expressions of entropy production for those components are presented. The results show that the reservoir volume has a significant influence on the entropy production in the various components when the reservoir to pulse tube volume ratio is smaller than about 5. The ratio is important to determine the minimum reservoir volume for a pulse tube cooler. Optimum settings for a double-inlet pulse tube cooler are also discussed.