The Influence of Oscillating Jet on the Liquid Jet Gas Pump’s Performance

When the liquid jet gas pump was used in gas absorption or jet aeration, there is a characteristic of jet mixing in its inner flow. In order to improve the effect of liquid-gas two phase mixing, an oscillating jet form was put forward and compared with the straight jet form. The oscillating jet was produced by a kind of fluidic element. The range of oscillating frequency was measured by the wall pressure pulsation. Factors which affect the oscillating frequency were analyzed, which mainly considered the change of working pressure and the length of signal pipe. The liquid jet gas pump was vertically installed on test rig, as the model pump’s working performance was experimentally studied. The results showed that the working pressures and the oscillating jet frequencies had great influence on the pump’s performance. When the oscillating frequency of the given model pump was set constant, the approximate linear h∼q performance curves had the close maximal h. When the working pressure was kept constant, the performance curves increased with the oscillating frequencies. As the area ratio of throat to nozzle m increased, the performance curves changed from steep to flat. The pump’s efficiency was low and the causes were analyzed. The study on oscillating liquid jet gas pump’s performance can help to improve the effect of jet mixing in pump and can make the pump to work more efficiently.