DEVELOPMENT AND ANALYSIS OF NEW THEORETICAL MODELS OF GAS DYNAMIC PARAMETERS OF LOW-FREQUENCY PRESSURE PULSATIONS IN EXHAUST TRACTS

The exhaust tract with a silencer installed in it is represented by a design scheme consisting of a set of separate volumes connected to each other by holes or pipes. The following assumptions were made during the calculations: working fluid (combustion products), ideal gas, gas – dynamic parameters are averaged by volume, thermodynamic parameters are constant, the walls of the structure are rigid, the turbulent jet behind the exhaust tract is non-isothermal. The basic equations of the gas-dynamic mathematical model are used: the equation of conservation of matter, the equations of conservation of energy, the equations of state. After the transformations, dependences are obtained that allow us to determine the flow rate at the gas outlet of the dynamic path, pressure, and temperature in various sections of the path.