Özet:

The paper deals with experimental research of aerodynamic drag and synthesis of data for virtually unstudied staggered bundles of flat-oval tubes at transverse air flow around. Experiments were conducted in an open-circuit rectangular cross-section wind tunnel in the range of Reynolds numbers from 2000 to 30000. In the processing and analysis of experimental data and dependences of the Euler numbers on the Reynolds numbers of flat-oval tube bundles, much attention was paid to factors which may influence the aerodynamic drag. During the experiments, several factors were identified: operation factor - flow rate W, geometrical factors - back and long pitches between tubes, the ratio of longitudinal and transverse dimensions of the tube (profile elongation) d2/d1. Based on the data obtained, generalized relationships for calculating the aerodynamic drag of staggered bundles of flat-oval tubes in a wide range of operation parameters and geometrical characteristics of tubes and bundles were developed. Author Biographies Євген Миколайович Письменний, National technical university of Ukraine "Kyiv Polytechnic Institute" 37 Peremogy ave., Kyiv, Ukraine, 03056 Doctor of Technical Sciences, professor Department of nuclear power plants and engineering thermophysics

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