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Analysis of the effects of wall perforations on the performance of a vehicle in a tube

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46 Figure 27 shows the comparison of two simulated internally propelled vehicles of 40 per cent blockage and lengths of 5…
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47 5. CONCLUSIONS This investigation concerns the effects of wall perforations on the performance of both externally and…
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the viscous flow field to diminish in extent and the drag to decrease. For the internally propelled vehicle, suitably…
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6. REFERENCES 1. Berman, A. S., "Laminar Flow in Channels with Porous Walls," J. Appl. Physics, Vol. 24, 1953, pp…
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15. Reference 8, p. 7. 16. Goodman, T .R., "Flow Properties of a Slender Body Traveling Centered in a Perforated Tube…
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u' ~ .,.V c----> (0) WALL - FIXED FRAME OF REFERENCE @) I P= Po U = Uw U = - V W » c: ____ __~ __ __ ~ (l)…
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52 - - - - - - - - -.--- - - - - - @) • @i®@ @ ---~-- _ _ --1-, _ _ _ _ _ _ DISCJ DRAG DISC -------- - -----…
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53 ---------.---~- 0 1®® @ (i) I - - - - - - - - - - - - - DRAG ACTUATOR DISC DISC Lv ~I P-Pa…
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~ORIFICE PLATE PERFORATED SECTION CALIBRATED NOZZL 7 E "\./"" 10' 71~ 3' ~I"'<…
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PRESSURE TAPS 0 I"" 4 1 ~I, 4 1 :>1 ~ h « ( t t t A r . .lL -_..u_-.11-_.J/_-.JLIhILIL-- __ JL_ Z~D.-…
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56 FIGURE 60 - PERFORATED TUBE-DRAG DISC FACI LITY FIGURE 6b- DRAG DISC REGION OF PERFORATED TUBE
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SYMBOLS 6 OUTFLOW 1/4" DIA. D <> 7 l l 6 II 5 P' 518 II 4 3 2 -I Vw -2 Vr -3 -4 -5 0 INFLOW…
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"'0 => u (J) -0 LLJ :::t: ..... ~ >- ..... u 0 ...J LLJ > 58 INVISCID - - - VISCOUS CT =.…
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w 0 z w 0::: W l1.. l1.. -c w 0::: ::> CJ) CJ) w 0::: Q. 1.4 1.2 I. 0 .- --..-- .8 .6 .4 .2 ~ - P2…
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2.8 o (.) 2.0 .. .... Z LL.I 1.6 (.) lL. lL. LL.I I. 2 o (.) (!) ~ .8 c (.) en - .4 c \ \ 00 DISC \ •…
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t- z UJ 0 lL. lL. UJ 0 (.) (!) « a: a (.) CJ) -a 2.8 '" = 2.5 0/0 CT 0 .02 - - - .01 - . 1.6 .…
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- 60 -50 .8 P- Po .6 .4 .8 .6 60 70 80 90 100 110 FIGURE 12 DRAG DISC ALONE-INVISCID FLOW PRESSURE AND VELOCITY…
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!l0 40 30 20 ,6 ,4 70 80 90 IQO 110 FIGURE 13 ORAG DI SC ALONE- VISCOUS FLOW P RESSURE AND VELOC ITY AS FUNCTI…
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CT O~ . 0 1 - - .02 - - - 2.5 % WALL POROSITY -.2 1.4 1.2 P- P 1.0 a .8 .6 .4 .2 .8 .6 90 100 110…
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1.0 p-p EXPERIMENTAL .8 a 0 >-- INVISCID FLOW THEORY >"" FLOW .6 '" = 4.80/0 .4 Cf = .56…
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U X -20 -15 -10 -5 5 10 15 20 0 .8 0 EXPERIMENTAL G .6 INVISCID FLOW THEORY 'i' = 4.8 % .4 C f…
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1.0 p-p a 0 EXPERIMENTAL .8 INVISCID FLOW THEORY .6 . '" = 4.8 Ok .4 C f = .56 .2 f3 = • 23 GEO. 5…
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N._ > Q.. -I'" ~ 0..0 I a.. - o - . I -.2 0 0 0 0 0 0 '- .3 o STATIC PRESSURE BEHIND THE…
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I V· 0 0 , 1 - C I I DISC - - - 0 - - 0 ~+,=.5 ~ I 1.0 ~ ". .875 .75 ... ... .625 .50 'i 0 .…
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f3. = .23 GEO. I II '4 AL. DISC boo 0 0 0 0 0 0 0 0 0 0 0 VELOCITY TRAVERSE 70 o 0 0 0 O"p-{J' o +=L+…
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