Nonmachine energy separation in channel with permeable walls

Abstract

New type of nonmachine energy separation method was considered. This method is based on the suction of “cold” portion of compressible boundary layer in channel with permeable walls. Numerical model of energy separation device (converged nozzle and permeable walls channel) was developed. The model was based on the Reynolds averaged Navier-Stokes (RANS) equations with additional equations of the turbulence model. Axisymmetrical approach was used for the analysis.The quantitative measure of the energy separation (temperature separation) can be defined as a difference between the total mass-average temperatures of the flow at the “hot” and “cold” outputs and at the input of the device.Validation of the developed model was conducted against of available measurement data. Parametric study was provided by using the developed model. A wide range of flow regimes was analyzed: from an impermeable wall to an asymptotic suction. The influence of the initial Mach number as well as the molecular Prandtl number on the energy separation is shown.