According to Bernoullis principle, {HEAD ~ the pressure} of {TAIL ~ the slow traveling air} in the gap 70 near the outlet end 56 is higher than the pressure of the fast traveling air exiting the truncated cone 52 
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According to Bernoullis principle , { HEAD ~ the pressure } of { TAIL ~ the slow traveling air } in the gap 70 near the outlet end 56 is higher than the pressure of the fast traveling air exiting the truncated cone 52
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH