COMPARATIVE ANALYSIS OF INFLUENCE GEOMETRICAL PARAMETERS OF THE GAS-GAS JET DEVICE WITHOUT THE DIFFUSER ITS OPERATING CHARACTERISTICS

Results of research of influence of geometry of flow passage (the position of a nozzle, length of the camera of mixture, confuser form) on the pressure head characteristic of the jet device without diffuser with excessive pressures of working gas 30, 50 and 80 kPa are given in article. Diameter of a working nozzle and cylindrical camera of mixture equal 1.5 mm and 3.2 mm were accepted. Research was conducted for the purpose of pressure decrease of working gas by change of geometry of flowing passage of the jet device on condition of minimization of mass-dimensional characteristics of the jet device due to removal of the diffuser. Use of similar devices is especially perspective in contours of recirculation of electrochemical generators. Refusal of the diffuser is most expedient for the battery of fuel elements with small difference of pressure (2 - 3 kPa) in a recirculation contour. After consideration more than hundred options of geometry of the jet device were revealed that the pressure head characteristic with the greatest pressure of mix and coefficient of injection is provided by the jet device with a corner of disclosure of 30 degrees, length of the camera of mixture of 15 mm and the position of a nozzle of 4 mm. Also it was defined that the mixture camera length providing the greatest growth of parameters of the characteristic doesn't depend on a corner of disclosure of a confuser in the investigated range of 40 - 160 degrees. With growth of working pressure there is a shift of the characteristic towards low coefficients of injection and high pressures of mix.