EXPERIMENTAL INVESTIGATION OF BASE PRESSURE WITH HOT SUPERSONIC JET FOR EXTERNAL SUPERSONIC FLOW

摘要

Results of an investigation of the flow structure and base pressure of a cylinder with a blunted nose cone with an supersonic jet in the centre of the model base into an external supersonic flow are presented. The object of this investigation is to obtain data for verification of numerical methods for base flow calculation. The results of two series of investigations are described. The first series includes methodical aspects of the experiment statement - a study of the influence of the supporting pylon position with respect to the base section of the model on the base pressure for different Mach and Reynolds numbers. The second series contains a study of the effect of the air -jet parameters (jet pressure ratio and temperature) on the base pressure. The investigations were conducted in the ranges of the nozzle pressure ratio of the jet N = p_(tj) /p_∞ = 0/650 and the stagnation temperature T_(tj) = 270/833K, here P_(tj)- is the pressure in the model receiver and p_ ∞ - is the free-stream pressure.