In order to study the pressure characteristics of the new oscillating cavity airlift pump,the liquid water was used as a transport medium for the test.The bottom suction pressure prediction model and pressure-efficiency model of the oscillating cavity airlift pump were established based on the principle of oscillating cavity shear flow and the conservation of mechanical energy.The pressure characteristic parameters of the airlift pump under different air intake volumes were obtained by means of the Pitot tube differential pressure meter.Then,the pressure pulsation spectrum at bottom suction positions of the airlift pump was obtained by means of MATLAB spectrum analysis.The results show that the established models can well describe the bottom suction pressure and transport efficiency of the oscillating cavity airlift pump,respectively.With the increase of air intake volume,the bottom suction pressure and transport efficiency of the oscillating cavity airlift pump increase and then decrease gradually.The intake air volume corresponding to the maximum pressure and efficiency is 79.9 and 26.9 m3/h,respectively.The frequencies corresponding to the peak pressure fluctuation amplitude at the bottom suction position of the oscillating cavity airlift pump with different intake volumes are basically similar,and are mainly distributed at 50,100,150,200,and 250 Hz positions.The research results can provide a theoretical basis for the design of airlift pump.
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