Mean Flow and Mass Exchange Structure in Dense Bundle of Fuel Rods of Gas-Cooled Reactor

The study gives the results of simulating gas flow in a dense bundle consisting of 37 finned simulators of fuel rods enclosed in a hexagonal cover. The paper presents characteristics of the experimental stand, the physical work site model, the system and measurement techniques. We describe a method for constructing computational grids for rod arrays with mostly hexagonal elements. We analyzed the distribution of average velocity, temperature, static pressure, friction losses in the bundle. The distribution was obtained from the results of numerical simulation and measured in a physical experiment with local flow heating at the entrance to the bundle and some part of the rod simulators. Findings of the research show that the differ-rence between the calculated and experimental data on the flow characteristics is due to the geometrical deviations of a physical model paths from the nominal path geometry used in the calculations. We draw the conclusion about the possibility of using SST turbulence model for simulating dense finned bundles of fuel rods.

References

[1] Adamov E.O., Dragunov Yu.G., Orlov V.V., et al. Mashinostroenie. Entsiklopediya. T. 24. Kn. 1: Mashinostroenie yadernoy tekhniki [Machine engineering. Encyclopedia. Vol. 24. P. 1. Nuclear engineering]. Moscow, Mashinostroenie Publ., 2005. 960 p.

[2] Markov P.V., Solonin V.I. Hydrodynamic characteristics of coolant flow in bundles of ribbed fuel rods located with increased pitch of spacing. Vestn. Mosk. Gos. Tekh. Univ. im. N.E. Baumana, Mashinostr. [Herald of the Bauman Moscow State Tech. Univ., Mech. Eng.], 2013, no. 4, pp. 60-70.

[3] Markov P.V., Solonin V.I. Influence of spacer type on fluid dynamics of 7-rod fuel assembly. Vestn. Mosk. Gos. Tekh. Univ. im. N.E. Baumana, Mashinostr. [Herald of the Bauman Moscow State Tech. Univ., Mech. Eng.], 2013, no. 1, pp. 38-48.

[4] ANSYS CFX solver theory guide. Release 16.0. ANSYS Inc. 2016.

[5] Snegirev A.Yu. Vysokoproizvoditel’nye vychisleniya v tekhnicheskoy fizike. Chislennoe modelirovanie turbulentnykh techeniy [High-performance computations in applied physics. Numerical simulation of turbulent flows]. Sankt-Petersburg, SPbSTU Publ., 2009. 143 p.

[6] Wilcox D.C. Turbulence modeling for CFD. DCW industries, 2006. 522 p.

[7] Garbaruk A.V., Strelets M.Kh., Shur M.L. Modelirovanie turbulentnosti v raschetakh slozhnykh techeniy [Turbulence simulation in complex flotation calculations]. Sankt-Petersburg, SPbSTU Publ., 2012. 88 p.

[8] Belov I.A., Isaev S.A. Modelirovanie turbulentnykh techeniy [Turbulent flow simulation]. Sankt-Petersburg, BGTU Publ., 2001. 108 p.

[9] Fomichev D.V., Solonin V.I. Pin bundles hydraulic characteristics of the BREST-OD-300 wire-spaced fuel subassemblies. Vestn. Mosk. Gos. Tekh. Univ. im. N.E. Baumana, Mashinostr. [Herald of the Bauman Moscow State Tech. Univ., Mech. Eng.], 2015, no. 2, pp. 4-17. DOI: 10.18698/0236-3941-2015-2-4-17

[10] Fomichev D.V., Solonin V.I. Structure of turbulent flow in the pin bundles of the BREST-OD-300. Vestn. Mosk. Gos. Tekh. Univ. im. N.E. Baumana, Mashinostr. [Herald of the Bauman Moscow State Tech. Univ., Mech. Eng.], 2015, no. 3, pp. 4-16. DOI: 10.18698/0236-3941-2015-3-4-16

[11] Patankar S. Numerical heat transfer and fluid flow. CRC Press, 1980. 214 p. (Russ. ed.: Chislennye metody resheniya zadach teploobmena i dinamiki zhidkosti. Moscow, Energoatomizdat Publ., 1984. 152 p.)

[12] ANSYS meshing user’s guide. Release 16.0. ANSYS Inc. 2016.

[13] Chirkin V.S. Teplofizicheskie svoystva materialov yadernoy tekhniki [Thermophysical properties of nuclear engineering materials]. Moscow, Atomizdat Publ., 1968. 485 p.

[14] Vargaftik L.P. Spravochnik po teploprovodnosti zhidkostey i gazov [Handbook on fluids and gases heat conductivity]. Moscow, Energoatomizdat Publ., 1990. 352 p.

[15] Kirillov P.L., Bobkov V.P., Zhukov A.V., Yur’yev Yu.S. Spravochnik po teplogidravlicheskim raschetam v yadernoy energetike. T. 1. Teplogidravlicheskie protsessy v YaEU [Handbook on thermohydraulic calculations in nuclear energetics. Vol. 1. Thermohydraulic processes in nuclear power plants]. Moscow, IzdAT Publ., 2010. 771 p.

[16] Abramovich G.N., Krasheninnikov S.Yu., Sekundov A.N. Turbulentnoe smeshenie gazovykh struy [Turbulent mixing of gas effluxes]. Moscow, Nauka Publ., 1974. 272 p.

[17] Dunaytsev A.A., Solonin V.I. Mass exchange processes in bundle of rods with ribs. Problemy mashinostroeniya i avtomatizatsii [Engineering and Automation Problems], 2016, no. 1, pp. 125-134.