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Three notes on propulsion and braking of tubeflight vehicles

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-2- the only steady-flow solution of the nonlinear differential equations governing the flow downstream of the vehicle is one…
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-3- h ~'( s ou1d -- the flow in the tube will be nonsteady. Since the pressure drag at subsonic and moderate…
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-4- conservation equations relating flow conditions immediately upstream and immediately downstream of a tubeflight vehicle…
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-5- at fixed distances behind the flame approach each other as time progresses, although it is not clear that their…
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-6- (Ref. 15), and of realistic assumptions concerning the internal ducting losses. The calculated performance is presented…
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-7- VEHICLES, TUBES, AND OPERATING CONDITIONS CONSIDERED IN THE ANALYSIS All vehicles considered in the present analysis have…
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-8- (a) it would restrict the freedom of transverse motion of the vehicle that the support and suspension mechanisms are…
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-9- Boundary layer suction is provided at appropriate locations on the surface of the vehicle for three main purposes: (a)…
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DRAG ANALYSIS 1. Drag of the body -- Unchoked flow. Fig. 1 identifies the main regions and dimensions of the analytical…
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-11- where C 1: is the nondimensional fric tion fac tor, defined as the frictional force per unit wetted area, divided by…
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-12- The boundary layer removal has the same effect on the transfer flow as an area expansion and, if it is carried out in…
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-13- Eq. (9) also yields p:z. = P, e Therefore, the buoyancy drag is ;2.. = TT d v 4- P, The ratio between frictional…
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-14- simplification, the body drag equations reduce to ::t Fa, .oG5 Pi M, Lv for dt 15 ft Fb .05~ P' M,l. Lv for dt…
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-15- computed in a later section. An accurate prediction of the parasite drag of the support system can- not be made at this…
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-16- signals generated by the flow inducer in the rear. Under these conditions, pumping of the transfer flow must take place…
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-17- F Ve'J ( '-d;l.. Trd V 4 f- C p (21) For the conditions selected in this analysis, = (22) The…
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-18- in the transfer passage, Fv > Fy , and the power required increases e~ with speed at a faster rate, along curve b-c…
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-19- shown that full recovery of the curtain momentum is possible with two- dimensional peripheral-jet pads in supercritica1…
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-20- At the highest speeds, the drag due to lift becomes a very small fraction of the total drag. When the flow is choked, it…
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-21- been made here with regard to the allocation of frictional forces and to the magnitude of certain parasite drag…
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-22- power demands of the tubeflight scheme exceed, at very low speeds, those of more conventional modes. Figs. 3, 4, and 5…
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-23- REFERENCES 1. Foa, J.V., "Propulsion of a vehicle in a tube," Rensselaer Polytechnic Institute, Rept. TR AE…
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-24- 13. Skinner, J.H., "Plane-flame simulation of the wake behind an internally propelled vehicle -- Part 2 --…
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shock line Fig. 2
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