Study on the performance characteristics of the ejector along the driving nozzle exit position

Most industrial processes use a significant amount of thermal energy, mostly by burning fossil fuels. Some part of the energy released in combustion is inevitably rejected to the surroundings as waste. This waste heat can be utilized in certain types of refrigeration system such a jet refrigeration cycle. The influence of the ejector system depends on a mixing by the shearing action between the primary flow and the secondary flow, the pressure loss by the shock wave at the ejector throat, the pressure recovery of a diffuser and etc. And the shape of the component elements for comprising influence is the important design parameters. Thus, in this study the condition that it can maintain the optimum operation state of the ejector system according to a change including the aspect ratio of the exit position of the driving nozzle and the length of the ejector throat length.