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