VESTNIK of Samara University. Aerospace and Mechanical EngineeringVESTNIK of Samara University. Aerospace and Mechanical Engineering2542-04532541-7533Samara National Research University638710.18287/2541-7533-2018-17-4-141-154UnknownNumerical simulation of low liquid flow in a mixer consisting of two centrifugal swirlersSemkinE. V.<p><span lang="EN-US">Leader of Design Department Team</span></p>niimash@list.ruResearch and Development Institute of Mechanical Engineering201220181741411542012201820122018Copyright © 2018, VESTNIK of Samara University. Aerospace and Mechanical Engineering2018<p>The paper describes a procedure of numerical simulation of operating fluid (water) discharge into the air environment through the hydraulic paths of a mixer composed of two low-flow coaxial swirl injectors. The method is based on a two-velocity model of a two-phase liquid flow and determining the interface interaction resistance coefficient versus the Reynolds number in the course of solution. The Reynolds number is calculated from the relative velocity of the liquid components forming the two-phase flow. The paper investigates variations in the mixer spray pattern versus two characteristic dimensions reckoned among the key parameters to calculate the coefficient of interface interaction resistance. Algorithms of calculating the coefficient of interface interaction resistance are proposed. The results of modeling liquid mixing and film flow breakdown within and beyond the mixer hydraulic paths for different values of the characteristic dimensions are presented. It is shown that we can achieve the conformity of the calculation results obtained by using the proposed method with the cold flow data by selecting the values of characteristic dimensions with reference to which interface interaction resistance coefficients are determined. Further works are projected.</p>Жидкостный ракетный двигатель малой тягисмесительгидравлический трактцентробежные форсункимоделирование теченияметодика расчётаNumerical simulation methodmixerswirl injectorflow simulationlow-thrust liquid rocket enginehydraulic path[1. Andreev Yu.Z. Issledovanie zavisimostey kharakteristik ZhRDMT tyagoy 50…400 N na toplive AT+NDMG ot osnovnykh parametrov dvukhkomponentnoy soosnoy tsentrobezhnoy forsunki i struynykh forsunok zavesy. Dis. … kand. tekhn. nauk [Dependence of 50…400 N NTO+UDMH liquid rocket engine characteristics on the basic parameters of a bipropellant coaxial swirl injector and jet injectors of the cooling film. Cand. Sci. (Eng.) dissertation]. Nyzhnyaya Salda, 2004. 181 p.][2. Semkin Ye.V. Research of liquid outflow from low-emission swirl injectors of a low-thrust liquid rocket engine. Vestnik of Samara University. Aerospace and Mechanical Engineering. 2016. V. 15, no. 4. P. 150-161. DOI: <a href='http://doi.org/10.18287/2541-7533-2016-15-4-150-161'>10.18287/2541-7533-2016-15-4-150-161</a> (In Russ.)][3. Tumanova E. CAE-system Flow Vision for investigation of liquid flow interaction within swirl-spray injectors. SAPR I Grafika. 2005. No. 9. Available at: <a href='https://sapr.ru/article/14574'>https://sapr.ru/article/14574</a> (In Russ.)][4. Serbin S.I., Vilkul S.V. Liquid fuel atomization modeling by pressure-swirl atomizer. Aerospace Technic and Technology. 2008. No. 7 (54). P. 95-98. (In Russ.)][5. ANSYS CFX-Solver, Release 10.0: Theory. ANSYS Europe Ltd, 2005. 266 p.][6. Sternin L.E., Shrayber A.A. Mnogofaznye techeniya gaza s chastitsami [Multiphase gas particle flows]. Moscow: Mashinostroenie Publ., 1994. 320 p.]