Effects of nozzle’s special-shaped structure on erosion performances of a self-excited oscillation pulsed jet
TANG Chuanlin1,XU Xu2,WANG Xiaguang2,HU Dong1
1.College of Energy and Mechanical-Electrical Engineer,Hunan University of Humanities,Science and Technology,Loudi 417000,China;
2.Modern Jetting Department,Hunan University of Technology,Zhuzhou 412007,China
In order to improve erosion efficiency of jets, erosion performances of a square nozzle and a circular nozzle were analyzed using a self-excited oscillation pulsed jet. The analysis model for erosion performances of different shapes nozzles was built based on the relationship between the self-excited oscillation pulsed jet device’s structural parameters and jet oscillation frequency. Taking a sand brick as the target, erosion volume and depth of the circular nozzle and the square one with the same equivalent area were measured, respectively. The effect laws of erosion time, oscillation chamber length and target distance on jet’s erosion performances were studied. Results showed that with increase in erosion time, the erosion volume and depth of the square nozzle are higher than those of the circular nozzle; the erosion depth of the former has a slower growth after beyond the optimal erosion time range; the change of chamber length has a larger effect on erosion depth, the optimal chamber length of the circular nozzle is smaller than that of the square nozzle; under the same condition, with increase in target distance, the decreasing amplitudes of the erosion depth and volume of the square nozzle are smaller than those of the circular nozzle, the damage area of the former’s erosion surface is larger than that of the latter’s. Test results agreed well with the theoretical analysis ones. The results provided a reference for designing and optimizing structural parameters of pulsed jet devices.
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