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| Experimental study on erosion and suction characteristics of self-excited inspiratory jet |
| ZHANG Mingxing1,2, KANG Yong1,2, ZHOU Yongxiang3, LIU Wenchuan1,2, WANG Aihua1,2,4 |
| 1.School of Power and Mechanical Engineering, Wuhan University, Wuhan, Hubei 430072, China; 2. Hubei Key Laboratory of Waterjet Theory and New Technology, Wuhan, Hubei 430072, China; 3.Nanjing Engineering Institute of Aircraft Systems, Jincheng, AVIC, Nanjing, Jiangsu 211106, China; 4.Center for Engineering Training and Innovation Practice of College Students, Wuhan University, Wuhan, Hubei 430072, China |
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Abstract A self-excited water-air jet is generated by the sucked air through four holes through the wall of a resonance chamber in front of a jet nozzle. Experiments were performed on this kind of jet to identify effects of inspiratory modes and diameters of suction holes on the self-excited inspiratory jet by examining erosion depth and damaged area in specimens and inspiratory capacity through the holes. The results showed that the erosion depth and damaged area increased with increasing diameter of the suction holes, and the erosion depth increased with the number of holes. Inspiratory modes played an important role in the erosion morphology of specimen and the unique erosion characteristics were observed when air was introduced. Additionally, the damaged area under the asymmetric inlet condition was significantly higher than under the symmetric inlet condition. The inspiratory flow was periodic, and the inspiratory capacity increased with increasing inlet pressure. Not only the inspiratory modes but also the diameter of suction hole affected the inspiratory performance. Particularly, the inspiratory capacity increased with increasing diameter of the suction holes when only one suction hole was in operation, while the best inspiratory performance was achieved at 4 mm diameter when multiple suction holes were open.
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Received: 16 August 2016
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