Abstract
This article describes methods for determining the hydraulic resistances of A/C system units. The advantages of computational hydrodynamics over the traditional method of calculation using the coefficient of hydraulic resistance are shown. A “step-by-step” example of calculating the hydraulic resistance of an A/C system unit in the ANSYS CFX software package is given (converting 3D geometry into a calculation model; selecting, configuring, and building a mesh model; configuring calculation parameters, including boundary conditions, turbulence models, and calculation stop criteria; calculating and processing results). Special attention is paid to the consideration of the SST turbulence model. The calculation results show the distribution fields of total and static pressure, velocity, and flow lines at discrete rotation angles. Graphically, the dependence of the drop in hydraulic resistance on the increase in the area of the flow section of the damper is shown. Hydraulic losses are also determined when the pressure increases. Conclusions are made about the application of the calculation results in creating a comprehensive model of the system
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