Abstract
In this paper, first, the principle, structures, operations, and performances of the cryogenic wind tunnel are described. By changing the pressure, temperature and velocity of gas a high Reynolds‐number flow (5 × 104 < Re < 107) can be obtained. From the research results, a high Reynolds‐number flow with comparatively low power, LN consumptions was attained. It was with Mach‐number independent of each other, o show some examples of high Reynolds‐number flow, the effects of surface roughness and grooves on the surface of a cylinder on the flow are measured using models with various values of roughness and size. A model test of an airship was also conducted. With the high Reynolds‐number flow, the thickness of the boundary layer becomes thinner. Then the surface conditions of a body have great effect on the flow phenomena and on the drag of the body. Some attempts to reduce the drag of the body were shown.
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