Ejector Design Calculation.pdf
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Zhang [28] investigated the performance of a single ejector and an ejector consisting of two units under thermal and hydraulic stresses. The results showed that the performance of single ejector was less than that of two ejector units under thermal and hydraulic stresses. The performance of the ejector was degraded under the thermal stresses due to the decrease of suction capacity of ejector. The performance of the ejector was degraded under the hydraulic stresses due to the increase of nozzle tip friction caused by the increase of pressure loss. The design of the ejector was optimized by considering the effects of thermal and hydraulic stresses based on the results of the performance tests.
Guby [27] carried out a research on the performance of ejectors installed in a building under different weather conditions. The results showed that the performance of the ejector was insensitive to variations in external temperature, the performance of the ejector was enhanced at the low-flow rate range (less than 0.3°m) and the performance of the ejector was degraded at the high-flow rate range (greater than 0.6°m) when the flow rate was increased from zero to the maximum flow rate.
The failure of ejector is mainly caused by mechanical friction and shear stress produced by the nozzle tip. The friction occurs at the nozzle tip due to the pressure drop of the injection water, and the shear stress occurs due to the asymmetry of the nozzle tip. Therefore, it is necessary to investigate the pressure loss due to friction at the nozzle tip and the asymmetry of the nozzle tip. The performance of the ejector has been tested and analyzed at a flow rate range of 6 to 10 L/min under the conditions of 2 to 8 bar absolute pressure and 20 to 100°C temperatures, using a centrifugal pump with a diameter of 700 mm and rotational speed of 150 rpm. The pressure losses due to friction at the nozzle tip of the ejector have been investigated and compared with the existing nozzle tip. The effects of rotation speed and pressure on the friction losses of nozzle tip have been also investigated. The performance of the system has been analyzed and evaluated based on the results of the performance tests.
The velocity ratio and pressure ratio for D1 and D2 are calculated with a constant suction condition for the nozzle. The pressure ratio is calculated with the inlet pressure, velocity ratio and Reynolds number. The data for calculation is given in Table 6.
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