Abstract：In order to compare erosion effect of the selfexcited inspired pulsatile jet with the continuous one under different submergence conditions,experimental studies of paraffin erosion caused from a jet was carried out by using own developed apparatus.In the experiments,the jet impact power,inspired air capacity,eroded surface depth,volume loss and eroded surface area were obtain under different submerged depths.The experimental results showed that the impact power of the continuous jet is larger than inspiration pulse jet; while the power of the inspired pulsatile jet is higher than that of the jet without inspiration.Moreover,the difference in impact power between the inspired and noninspired jets steadily gets smaller with increasing submerged depth.When the submerged depth is shallower(30 m or less),the eroded surface depth of the continuous jet is smaller than the inspired pulsatile jet due to the stronger denudation caused from the air inspired.However,if the submerged depth is deeper(40 m or more),the eroded surface depth of the continuous jet is larger than the inspired pulsatile jet because of the less air inspired.The eroded surface area and volume loss of the inspired pulsatile jet are less than the continuous jet under various submerged depths.The eroded surface area and volume loss of two kinds of jet become small gradually,and their difference between the two jets also gets closer and closer with increasing submerged depth.
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