Schlieren Diagnostics of a Hypersonic Gas Target Neutron Generator

摘要

The gasdynamic behavior of a planar model of the Los Alamos geometry hypersonic Gas Target Neutron Generator (GTNG) was investigated using Schilieren flow visualization photographs, static and total pressure and spill flow measurements. The model consisted of two symmetrical expansion nozzles with 220 microns throats producing a combined flow of about Mach 4 in the GTNG channel. Stagnation pressures of 100-800 kPa were used. Two basic flow configurations, spill line closed and spill line open, were studied in order to gain insight into the complex boundary layer development near the nozzle exit planes. Both flow configurations are discussed qualitatively, making use of the pressure measurements and theoretical analysis.