The Design Research Of Nozzle For Supersonic Separator

The supersonic separator is mainly composed of swirl generator, supersonic nozzle and diffuser tube. Condensation separation of water and heavy hydrocarbons is achieved by the vortex separation effect of the vortex generator and the expansion refrigeration effect of the supersonic nozzle, which has the advantages of simple structure, low energy consumption and easy maintenance etc.. Supersonic nozzle is used to produce supersonic flow, generally circular or annular section, which is the key refrigeration component of supersonic separator and has a great influence on the dewatering efficiency.According to the basic theory of aerodynamics, this paper has put forward a method to design supersonic separator nozzle section, that is Vito Hinske and R correction curve combined with the Characteristic Line Method. Based on the basic theory of computational fluid dynamics and turbulence model, the CFD software is used to carry out numerical calculation and test the effect of nozzle design, meantime it is also used to do numerical calculation and comparative analysis for nozzles between designed by this method, method combined Vito Shinseki curve with Foelsch and curve combined with cone tube method. The results suggested that all the parameters of nozzle exiting flow have reached the design requirement; and the nozzles designed by this method have a better performance in the internal flow field uniformity compared with the traditional design method.In order to explore the efficiency difference in dehydration between the nozzles designed by different methods, the matching supersonic condensing flow model was established based on the classical nucleation theory. After the solution along the flow direction was advanced, the calculation results conformed to the experimental data. By applying the model to the supersonic nozzles designed by above three different methods, a comparative study for its dehydration performance was conducted and showed that the nozzle’s dehydration efficiency designed by the Vito Hinske and R correction curve combined with the Characteristic Line Method is higher than the traditional design method.Based on the supersonic condensation flow model, this paper analyzed the influence that the nozzles inlet pressure has on the Wilson point position and the dehydration efficiency of nozzle designed by the the Vito Hinske and R correction curve combined with the Characteristic Line Method and then the optimum condition of the nozzle is determined.