| Abstract: | Interferometric measurement of the air density in a supersonic nozzle of rectangular cross section is described. The flow structure is studied in a real Laval nozzle. It is shown that the core flow follows the laws of motion of an ideal gas and has a wave nature. The relation  Z=(3–4)y is obtained for the boundary layer thickness on the nozzle walls for nozzle width-height ratio L/h=3.75–7.5.The flow structure in a real supersonic nozzle may differ significantly from the theoretical structure, both because of defects in nozzle fabrication and because of boundary layer growth on the nozzle walls. In many casesitis important to know the param'eters of the supersonic flow in the actual nozzle. The determination of these parameters (density  , pressure , temperature T, velocity u, Mach number M) at any section of the nozzle in question is the objective of the present investigation.The authors wish to thank V. P. Koronkevich for his assistance in this study. |
