from one being mysteriously made by giant sloths to another that has been labelled an 'entrance to hell'. Tunnels, big and small, have come a long way since the first was thought to have been ...

The small wind tunnel with a 16-by-16 inch test section is a low speed, open return tunnel, as shown in Figure 1. It is mainly used for airfoil section tests and teaching. he velocity is up to 50 m/s.

It also turns out that the proposed construction method causes less deformation, and the method can be applied to the construction of the small interval tunnel in the Santunbei turn line of metro. The ...