Characteristics of flow of oscillatory-relaxing gas in nozzles with constant cross-sections in throat region

A steady two-dimensional mixed sub- and supersonic flow of a nonviscous nonheat-conducting oscillatory-relaxing gas in flat compression-expansion nozzles having an area with a fixed cross section in the throat area and two bends in the contour at the beginning and end of the fixed area was investigated. The results were obtained by solving gas dynamic equations and relaxation kinetic equations simultaneously based on the approach used for the direct problem of the flow of gas in a Laval nozzle in the presence of non-equilibrium physico-chemical processes. When 1 sub p 2(1 sub p = L sub p/(h*/2), where L sub p is the length of the area with fixed-cross section of diameter h* in the throat region, all of the oscillatory energy stored in the subsonic part of the nozzle is lost.