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Facility T-3 : a wind-tunnel for tubeflight experimentation

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23 FIG. lla. Rensselaer T-3 Facility FIG. lIb. Typical Tubeflight vehicle Installed in T-3.
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Far-field aerodynamics of tubeflight propulsion

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TR PT 6903 FAR-FIELD AERODYNAMICS OF TUBEFLIGHT PROPULSION by Joseph V. Foa This research was supported by the Office of…
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SUMMARY Tubeflight is a high-speed tube transport scheme in which the vehicle derives its propulsion from the fore-to-aft…
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SYMBOLS At cross-sectional area of the tube ~ maximum cross-sectional area of the vehicle CD drag coefficient (based on…
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INTRODUCTION The tubef1ight vehicle propels itself by means of an on-board flow induction device that transfers air from the…
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2 at supersonic speeds). No such solution could be found, however, for the flow behind the vehicle in the subsonic case…
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3 might be called a "dynamic cycle" (to avoid confusion with the thermal cycle to which the same fluid particles…
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4 reference, and the flow is treated as steady, viscous, heat conducting, compressible and one-dimensional throughout. Only…
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Eq. 1 shows that (dF/dx)/(uoo-u) is always positive. It follows, then, from Eq. 3, that dho/dx ~O depending on whether h O ~…
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6 Third Phase -- Generation of Thrust The third phase occurs from station b to station~, through the actuator disc, and is…
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7 Also, for an isentropic transformation in a constant-area duct, ~b - t~)~ = t~br and, again by definition, Therefore, (6…
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8 or (8) Thus, Eq. 7 becomes (7' ) o Since hb and ~ = ( 0 0 0 0 0 hoo and (hc -hb ) s = 7( (hc -hb ), and…
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9 phase is obtained if, in the light of the already discussed results of Refs. 5 through 9, the static pressure is assumed to…
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10 paragraphs can be performed by iterative but very simple graphical or numerical methods for any tube-vehicle-thrust…
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11 Cycle OO-a-b-c-CX)is for?? = 1.0, whereas cycleoo-a'-b'-c'-OOis for a lower efficiency. Because of the…
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12 the effects are reversed: namely, the drag of the vehicle is lower in climb than in level flight and the excess power…
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13 and of its support system are taken from Ref. 4. Finally, for each case, three operating conditions are considered: steady…
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14 Fb to 1.0. It is seen that this assumption, which is also implied in the analysis of Ref. 4, introduces a slight error, on…
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