The study focuses on the construction and application of nomograms for describing the formation of swirling air jets, widely used in ventilation systems. These jets have a complex three-dimensional structure with axial, radial, and tangential velocity components, which enhance mixing, reduce gradients, and improve air distribution efficiency. To adequately represent these processes, the paper proposes a methodology for building nomograms based on analytical expressions of axial velocity and excess temperature in non-isothermal jets. For simplification, velocity decay (m) and temperature decay (n) coefficients are introduced as reference characteristics of air-distribution devices, defined theoretically or experimentally. The resulting dependencies, presented in a nomogram, allow quick data interpolation, facilitate analysis of geometric and operational factors, and support optimization of ventilation and air-conditioning systems.
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