Aerodynamics and Stability of the Flow in Relatively Long Cyclone Chambers

The article presents and analyzes the results of an experimental study of the aerodynamics of the flow in the working volume of cyclone chambers of a large relative length, significantly exceeding the length of the chambers that were used in the previous studies. Air supply to the chamber swirler was carried out tangentially from diametrically opposite sides by two inlet channels. The air discharge from the working volume of the chamber was made from the opposite end of the chamber through a round axisymmetric hole. The values of the area of the inlet channels and the diameter of the outlet were varied with replaceable incrustations and clamps. The experiments were performed with the use of laser Doppler anemometry. As a result, previously unknown features of flow formation in the working volume of relatively long cyclone chambers have been determined. The main characteristic values of the working volume flow have determined as well. In particular, the determining influence of the flow core characteristics on its structure in relatively long cyclone chambers has been discovered. The calculated ratios have been chosen to determine these values depending on the geometrical characteristics of the chamber under study. The boundary of the near-wall flow region, in which favorable conditions for the flow instability are created, is determined. Numerical simulation of the flow in the ANSYS Fluent software has been performed. Based on its results, a comparison of the results of numerical simulation, calculated dependencies and experimental data is presented. A comparison of the results demonstrated a completely satisfactory coincidence. Data obtained in the process of research and calculated ratios can be used in engineering practice and are of an interest from the point of view of further study of aerodynamics in a highly swirled flow of cyclone devices in order of to improving the methods of their thermal and aerodynamic calculations.

1. Kalishevskii L. L., Katsnel'son B. D., Knorre G. F., Nadzharov M. A. (ed.) (1958) Cyclone Furnaces. ?oscow, Gosenergoizdat Publ., 216 (in Russian).

2. Pugovkin A. U. (1987) Recirculation Flame Furnaces in Mechanical Engineering. Leningrad, Mashinostroenie Publ. 158 (in Russian).

3. Sidel'kovskii L. N., Shurygin A. P. (1962) Cyclone Power Technology Plants. Moscow, Gosenergoizdat Publ., 80 (in Russian).

4. Saburov E. N. (1995) Cyclone Heating Devices with Intensified Convective Heat Exchange. Arkhangelsk, North-West Book Publ. 341 (in Russian).

5. Kutateladze S. S., Volchkov E. P., Terekhov V. I. (1987) Aerodynamics and Heat and Mass Transfer in Limited Vortex Flows. Novosibirsk, Institute of Thermophysics of the Siberian Office of Academy of Sciences of the USSR. 282 (in Russian).

6. Saburov E. N., Karpov S. V. (1993) Cyclone Devices in Woodworking and Pulp-and-Paper Production. Moscow, Ekologiya Publ. 368 (in Russian).

7. Saburov E. N. (1968) On the Influence of the Relative Length of Cyclone-Vortex Heating Chambers on the Aerodynamics of the Heating Flow. Kuznechno-Shtampovochnoe Proizvodstvo [Forging and Stamping Production], (3), 35–38 (in Russian).

8. Doppler Ch. (1907) Abhandlungen. Leipzig, Verlag von W. Engelmann. 195 (in German).

9. Rinkevichus B. S., Fabrikant V. A. (ed.) (1990) Laser Flow Diagnostics. Moscow, MPEI Publ., 1990. 288 (in Russian).

10. Buchhave P., George W. K., Lumley J. L. (1979) The Measurement of Turbulence with the Lazer – Doppler Anemometer. Annual Review of Fluid Mechanics, 11, 443–503. https://doi.org/10.1146/annurev.fl.11.010179.002303.

11. Ostashev S. I., Saburov E. N. (2011) Modeling of Thermal and Aerodynamic Processes of Cyclone Sectional Heating Devices. Arkhangelsk, Northern (Arctic) Federal University. 195 (in Russian).

12. Shchukin V. K. (1980) Heat Exchange and Hydrodynamics of Internal Flows in the Fields of Mass Forces; 2nd ed. ?oscow, Mashinostroenie Publ. 240 (in Russian).

13. Onokhin D. A., Saburov E. N. (2018) On Some Peculiarities of the Structure of the Flow in the Relatively Long Cyclone Chamber. Vestnik Cherepovetskogo Gosudarstvennogo Universiteta = Bulletin of the Cherepovets State University, 2018, 2 (83), 25–30 (in Russian). https://doi.org/10.23859/1994-0637-2018-1-83-3.