Experimental and Numerical Analysis of Flow Behavior for Reverse Circulation Drill Bit with Inserted Swirl Vanes

<table class="figure-group"><tr class="fig-image" id="a"><td><object data="https://static.hindawi.com/articles/geofluids/volume-2022/2472280/figures/2472280.fig.002a.svgz" name="2472280.fig.002a" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(a) </b>Drill bit with a shroud</td></tr><tr class="fig-image" id="b"><td><object data="https://static.hindawi.com/articles/geofluids/volume-2022/2472280/figures/2472280.fig.002b.svgz" name="2472280.fig.002b" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(b) </b>Drill bit based on ejector</td></tr></table>

<div>Drill bit with reverse air circulation. 1: borehole wall; 2: drill bit body; 3: shroud; 4: drive sub; 5: hammer casing; 6: central passage; 7: connector; 8: flushing nozzles; 9: inner suction nozzles.</div>

Geofluids

fig2

Figure 2

Figure 2: Experimental and Numerical Analysis of Flow Behavior for Reverse Circulation Drill Bit with Inserted Swirl Vanes 