– Wind tunnel is a device, by artificially producing airflow relative to a stationary body that measures aerodynamic force and pressure distribution to simulate with actual conditions. Wind Tunnels offer a rapid, economical, and accurate means for aerodynamic research. The most important aspect of wind tunnels is their ability to accurate recreate the full complexity of full fluid flow. In the ...

This paper is intended to evaluate the wall effects in the pure-drag case of plane cavity flow past an arbitrary body held in a closed tunnel, and to establish a n accurate correction rule. The three theoretical models in common use, namely, the open-wake, Riabouchinsky and re-entrant-jet models, are employed t o provide solutions in the form of some functional equations. From these theoretical...

Results of measurements of control-surface oscillatory derivatives on a sweptback, tapered half-model of a lifting surface of aspect ratio 2 are presented. The measurements were obtained during the development of a derivative rig which measures normal force, pitching moment, wing bending moment and hinge moment due to control surface oscillation. They were made in the 18 in. × 14 in. (0.46 m × ...

The pressure-regulating valve can realize the rapid adjustment and precise controlling of operating pressure Mach number, to stabilize flow field avoid test interference such as air source loss or unstable flow. This paper takes design optimization in trisonic intermittent wind tunnel research object investigate its special characteristic performance tunnel. According requirement tunnel, annula...

Endoscopic carpal tunnel syndrome surgery is a modern minimally invasive method of carpal tunnel decompression. However, the method does also have its critics, who emphasize that there is an increased rate of complications in comparison to open procedures. To further improve and optimize results of endoscopic surgery we used an intracarpal pressure sensor to verify the effect of carpal tunnel d...

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The effects of condensation of the world.ng gee (nitrogen) on pitot and static pressures in the R.A.R.D.E. hypersonic gun tunnel have been examined and the onset of condensation determined for flow Mach numbers of 8.4, 10.4 and 12.9. A large degree of supersaturation was observed at the two higher Maoh numbers. Symbols M flow Mach number P statio pressure P 1 stagnation pressure p2 pitot pressu...

Abstract The CFD model of the train-tunnel system, previously developed on proven analytical dependencies, is improved by introduction a tunnel cross-passage and consideration surface roughness. These additions bring simulation setup closer to real conditions allowing explore FDS features in evaluation aerodynamic effects occurring tunnel. Pressure velocity patterns are obtained for resulting h...

Finite element technique is used to model two phases of tunneling process, namely; excavation and rocklining interaction. The excavation phase is responsible for determining the pre-lining rock mass deformations and the reduced in-situ stresses. The interaction phase models the compatibility of the rock-lining system. The deformations and stresses of the rock-lining system and the final rock ma...