Design And Research On The Performance Of The Vortex Supercharger For Natural Gas

Vortex supercharging device is a new gas supercharging device, belonging to the impeller machinery. As its unique supercharging principle, making it have the suction and blowing function at the same time, not only can produce high pressure rise, but also can produce vacuum. It has the advantages of simple structure, less quick-wear part, less maintenance and low cost, sometimes can replace the compressor under certain conditions.As so many advantages of vortex supercharging device, based on the requirement of the actual conditions, this paper decides to use the vortex supercharging form to design a set of equipment for natural gas. Due to the vortex supercharging principle lack of a complete theoretical support, this paper combines empirical formula and numerical simulation to determine the main structure of equipment. In addition, thinking about the working medium is flammable and explosive gas, this equipment adopts double mechanical seal and O ring seal to ensure that equipment seal.In this paper, using the three-dimensional drawing software Pro/E to establish the three-dimensional geometric model of the vortex supercharger flow region, divided into a channel region and a rotating region, using the pre-processing software Gambit to carry on the grid division, using the Reynolds averaged method Realize k-ε model and MRF rotation model to iterative calculation.In this paper, we get the internal flow field of the channel by numerical simulation, from the entrance to the equipment export presents obvious pressure gradient. From the trace obtained by simulation, we found the fluid shuttle between the channel and blade channel by spiral form. From the velocity vector in the radial cross section of the channel, we found the presence of the longitudinal vortex, same as the form of the vortex supercharging principle. From the relationship between rotation rate and flow in the condition of target pressure, and the relationship between rotation rate and pressure in the condition of target flow by numerical simulation to get the effect of rotation rate on the performance of the equipment. From the comparison the simulation results of methane in working condition and air in atmospheric pressure condition, the mass flow of two conditions are nearly, and proportional to the density, which can be used to guide the air in place of methane to the performance experiment. In addition, this paper simulates the effect of the pipe diameter of import and export, and the width of annular channel on the performance of the equipment to optimize the structure of the equipment.In this paper, an experimental platform is built for the performance experiment of the equipment, from collecting the experimental data under different conditions by measuring the exhaust end parameters method, getting the pressure rise and efficiency performance curve under different frequency. Found the maximum efficiency of equipment when the pressure rise is15kPa, in45Hz. Under the condition of the same pressure rise, the equipment efficiency decrease with the decrease of the frequency. At last, from the comparation between the experimental results and the simulation results, to verify the feasibility of the numerical model, and it was found that the simulation result is slightly better than the experimental result.In summary, the performance of the vortex supercharger designed for natural gas is good and can meet the requirements of the process. At the same time, the numerical model established in this paper can be used to predict the performance of the vortex supercharger, can provide reference for the design of equipment.