Effective Centered Expansions in Shock Tube Flows for Condensation Studies,

摘要

Experimental investigations of the shock tube expansion flow have been carried out in the driver section by measuring the wall static pressure-time histories at three different observation stations. It is found that the effects of non-idealities in the actual flow manifest themselves predominatly close to the origin of the expansion process. A shift in the origin of the expansion process with respect to the diaphragm location is thus produced. The 'virtual origin' of the expansion can be determined by wall static pressure measurement at a single observation station and the effects of the nonidealities in real flow can be corrected once this virtual origin is found experimentally. A much improved shock tube method of studying condensation now exists in whcih the flow properties in the expansion fan are completely determined by static pressure measurements at two different observation stations with the onset of condensation determined by light scattering as before.