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| Effects of hydraulic locking on performance of liquid-jet hammer |
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CHEN Jia-wang1,PENG Jian-ming2,YIN Qi-lei2,ZHAO Zhi-qiang2
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(1. Key Laboratory of Fluid Power Transmission and Control，Zhejiang University, Hangzhou 310027，China;2. College of Construction Engineering, Jilin University，Changchun 130026, China)
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| Abstract: |
| The performance parameters of the prototype of a new generation of the liquid-jet hammer were calculated by means of CFD dynamic simulation. The simulated results were compared with those measured results. The results show that if the friction caused by hydraulic locking was ignored, the calculated blow frequencies, impact velocities and blow energies were 1. 853 - 1. 898 times, 2. 024 - 2. 107 times and 4. 097 - 4. 439 times as great as the measured values respectively. While the friction caused by hydraulic locking was taken into account, the calculated blow frequencies, impact velocities and blow energies were 1. 218 - 1. 439 times, 0. 936 -1. 171 times and 0. 876 _ 1. 371 times as great as the measured values respectively, the simulated results were more highly consistent with the measured values. The friction caused by hydraulic locking can greatly increase the resistance to the movement of the piston，and reduce its acceleration and velocity, and thus decrease the blow energy and blow frequency of the hammer. The blow energy and energy efficiency might be increased by taking measures to eliminate the friction caused by hydraulic locking. |
| Key words: liquid-jet hammer hydraulic locking CFD analysis |
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