Abstract
Owing to the complex interaction between the output-fed fluidic oscillator and the moving part of the fluidic down-the-hole (DTH) hammer, the jet switching mechanisms and output response are not clear. Focusing on an output-fed fluidic oscillator, we systematically analyzed the switching mechanisms and output response based on a newly designed fluidic DTH hammer over full stroke. The results show that the oscillation frequency depends on the load characteristic and varies more or less in direct proportion with the Reynolds number. The impact feedback is optional rather than necessary for the switching of the main jet in the output-fed fluidic oscillator. When the partial stroke disappears, the output-fed fluidic oscillator operates under a constant Strouhal number.
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