| The injector is an equipment to increase the fluid pressure, but it doesn’t consume mechanical energy directly at the same time. It has been widely used because its structure is simple and reliable, its running cost is low. However, ejectors are inefficient, not energy-saving, how to improve their efficiency is a common concern. Currently, the design of ejectors generally based on the operating parameters to determine the specific structure, and the calculating formula which used are mostly based on One Dimensional Isentropic Hypothesis and they are semi-rational formulas. But for the studies to research details like experimental observation, analysis simulation and the performance of the ejector affected by injector structure are sufficient because of the limit of experimental level, computing power, the theory of fluid mechanics development level. For the ejectors use steam as working substance, the result solved by simple ideal gas equation deviates from the actual value largely because the properties of steam is far away ideal gas state.The article is to get the design, dimension of ejectors bases on Sokolov’s Jet Design Theory, assumed pressure mixing are constant, used VC language to edit program that calculate ejector jet coefficient, and is assisted by empirical formula. It is used FLUENT software to perform numerical simulation of fluid mixing process in steam ejector. Analysing the influence by some factors like turbulence model, the discrete format and so on to obtain grid convergence of the solution.It can know the flow process and operating principle of injector by observing internal flow field contours of ejectors. It gets change rule of jet coefficient following structure parameters by changing structure parameters of ejectors. It analyses the changing of jet coefficient following operating parameter by changing operating parameter. |
