General system of equations is considered averaging turbulent moving a viscous heat conductive gas with the chemical components in the form, complying stationary equations of gas dynamics. The parameters being received as a result of averaging, have the same meaning, as real parameters of gas in stationary flows. Analogues of current lines are proposed – expense-threads. Model of flow is analysed in which only normal pressure acts on surfaces, formed by expense lines. Such approach increases the possibilities of structured-element modelling of gas-stream processes (SEM).