Journal
SENSORS AND ACTUATORS A-PHYSICAL
Volume 270, Issue -, Pages 127-135Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.sna.2017.12.043
Keywords
Fluidic oscillator; Fluidic DTH hammer; Impacting performance; Impact body
Funding
- China Postdoctoral Science Foundation [2017M622609]
- Open Research Fund Program of Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, China [2017YSJS08]
- Open Research Fund Program of Key Laboratory of Drilling and Exploitation Technology in Complex Conditions, Ministry of Land and Resources, China [KLDET2017015]
- Ministry of Land and Resources of China [201311112]
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Focusing on various designs of fluidic oscillators for fluidic down-the-hole (DTH) hammers, we systematically analysed the critical Reynolds number, operating range, and impacting performance via numerical and experimental methods. The blocked load-instability and load-stability were proposed to characterize the initiation mechanism of the fluidic DTH hammer; moreover, we intend to provide a few new design bases. Analyses of the waveforms of the acoustic signals further corroborate the new design concept. Additionally, the original plane-wall fluidic oscillator and the fluidic oscillator with concave attachment walls and shorter splitter distance were designed and manufactured. A sequence of numerical and experimental investigations on the new designed fluidic oscillator have been done and verified to improve the performance of the fluidic DTH hammer. It is observed that it is more straightforward to initiate the fluidic oscillator with concave attachment walls and shorter splitter distance and that it exhibits a broader operating range. The impacting performance of the fluidic DTH hammer with the concave-wall and shorter-splitter-distance fluidic oscillator is the highest. In particular, the results obtained in terms of impact energy and output power exhibit enhancements of up to 12% and 15.6%, respectively, compared to the original fluidic DTH hammer. The impact body of an optimally designed fluidic DTH hammer has a mass of approximately 8 kg. (C) 2017 Elsevier B.V. All rights reserved.
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