Calculation-theoretical study of characteristics of the two-phase flow in a sandblasting machine

Keywords: thermo-abrasive treatment, sandblasting machine, supersonic ejector, two-phase flow, finite volume method


The paper considers the possibility of conversion applying of a rocket engine as a sandblasting machine for thermo-abrasive treatment. The higher performance characteristics of a treated surface can be achieved through the exposure of the high-temperature two-phase flow accelerated in the device nozzle barrel on the object. The ejection feed of granular abrasive substances determines the relative structural simplicity of the device structure. The authors prove the efficiency of such a device using the gas-dynamic process modeling in the CFD software package, the calculations of which are based on combined equations including the key parameters of both the carrier gas and the solid phase particles. The process modeling considers the influence of the geometry and the specifics equal to the real operating prototype. During further analysis, to determine the optimal mode, the authors investigated the influence of various border conditions on the supersonic two-phase flow. The study considers the mutual influence of gas flow and abrasive solid particles starting from the powder delivery section to the nozzle outlet section. The study presents the comparison of temperature and pressure fields depending on the input values, as well as the fluid velocity fields based on these values. The authors carried out the analysis of the dependence of solid particle motion speed on the coordinate at various initial data of temperature and pressure. The study pays special attention to the consideration of the impact of the k-phase particle size on the speed parameters. During the study, the authors identified the main methods of device adjustment to achieve the required mode parameters. As a result of the analysis, the paper concludes on the efficiency and competitive ability of the thermo-abrasive treatment method under the study.

Author Biographies

Nikolay D. Gorelov, Bauman Moscow State Technical University

student of Chair “Rocket Engines”

Vsevolod V. Popov, Bauman Moscow State Technical University

student of Chair “Rocket Engines”

Vladimir V. Bernikov, Bauman Moscow State Technical University

engineer of the Research Institute of Power Engineering


Yagodnikov D.A., Aleksandrenkov V.P., Vlasov Yu.N. Aktualnye problemy raketnogo dvigatelestroeniya [Actual problems of rocket propulsion]. Moscow, MGTU im. N.E. Baumana Publ., 2017. 295 p.

Tsegelsky V.G. On the theory of gas ejectors having cylindrical and conical mixing chambers. Izvestiya vuzov. Mashinostroenie, 2012, no. 2, pp. 46–71.

Tsegelsky V.G., Akimov M.V., Safargaliev T.D. Experimental and theoretical investigation of operating modes of supersonic gas ejectors with cylindrical and conical mixing chambers. Izvestiya vuzov. Mashinostroenie, 2012, no. 3, pp. 48–58.

Tsegelsky V.G. Struynye apparaty [Inkjet machines]. Moscow, MGTU im. N.E. Baumana Publ., 2017. 573 p.

Lepeshinsky I.A., Reshetnikov V.A., Zarankevich I.A. Numerical modeling and experimental research of a two-phase liquid-gas ejector with a profiled supersonic nozzle. Vestnik Samarskogo universiteta. Aerokosmicheskaya tekhnika, tekhnologii i mashinostroenie, 2017, vol. 16, no. 2, pp. 164–171.

Zhu Y., Cai W., Wen C., Li Y. Numerical investigation of geometry parameters for design of high performance ejectors. Applied Thermal Engineering, 2009, vol. 29, no. 5-6, pp. 898–905.

Kim S., Kwon S. Experimental determination of geometric parameters for an annular injection type supersonic ejector. Journal of Fluids Engineering, 2006, vol. 128, no. 6, pp. 1164–1171.

Vojta L., Dvorak V. Measurement and calculating of supersonic ejectors. EPJ Web of Conferences, 2019, vol. 213, pp. 1–7.

Dandani M., Lepiller V., Abderrahmane G., Désévaux P. Numerical Visualizations of Mixing Enhancement in a 2D Supersonic Ejector. Fluid Dynamics and Materials Processing, 2018, vol. 14, no. 1, pp. 23–37.

Minyazev D.V. Sandblasting abrasives. Nauka i obrazovanie segodnya, 2017, no. 6, pp. 30–34.

Chung T.J. Computational Fluid Dynamics. Cambridge University Press, 2010. 2nd ed., 1058 p.

Blazek J. Computational Fluid Dynamics: Principles and Applications. Elsevier, 2015. 3rd ed., 451 p.

Schlichting Н. Boundary Layer Theory. New York, McGraw-Hill, 1979. 7th ed., 817 p.

White F.M. Viscous Fluid Flow. New York, McGraw-Hill, 1991. 614 p.

Vinokur М. Conservation Equations of Gas Dynamics in Curvilinear Coordinate Systems. Journal of Computational Physics, 1974, vol. 14, pp. 105–125.

Bussing Т.R.А., Murman Е.М. Finite-Volume Method for the Calculation of Compressible Chemically Reacting Flows. AIAA Journal, 1988, vol. 26, pp. 1070–1078.

Liepmann H.W., Roshko А. Elements of Gas Dynamics. New York, John Wiley & Sons, 1957. 460 p.

Hunter C.A. Experimental investigation of separated nozzle flows. Journal of propulsion and power, 2004, vol. 20, no. 3, pp. 527–532.

Morsi S.A., Alexander A.J. An investigation of Particle Trajectories in Two-Phase Flow Systems. Journal of Fluid Mechanics, 1972, vol. 55, no. 2, pp. 193–208.

Bardina J.E., Huang P.G., Coakley T.J. Turbulence Modeling Validation, Testing, and Development. Washington, Ames Research Center, 1997. 87 p.

Technical Sciences