Analytical Method of Profiling Axial-Radial Compressor Impellers

Rusanov, Andrey; Rusanov, Roman; Pashchenko, N. V.; Chuhai, Maryna O.

doi:10.15407/pmach2018.04.004

Cited by 2 publications

(1 citation statement)

References 6 publications

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“…Тут Rрадіус золотника ГР; μ, ρвідповідно коефіцієнт витрати і щільності робочої рідини (РР); P МНУтиск РР в МНУ; А Кплоща перерізу підвідних і відвідних каналів ГР; Еоб'ємний модуль пружності РР; V ОН , V ОСпервинний об'єм відповідно в напірній і зливній порожнинах сервомотора; F ТРсила тертя поршня і штока сервомотора об стінки; mсумарна маса рухомих частин, приведена до осі сервомотора; βкоефіцієнт в'язкого тертя; А Пефективна площа поршня сервомотора; x Zпереміщення штока СМ [15][16][17][18][19][20][21].…”

Section: (α Sin α)unclassified

Turbine Speed Control

Hasiuk

2022

HM and HU

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Provides analysis of hydraulic turbine control systems existing in the world and domestic practice. The design features of constructing circuits with discrete and discrete-analog control methods are considered. The schemes for controlling the speed of the turbine of the leading manufacturers of hydraulic turbine equipment are given: PO "LMZ" and ALSTOM POWER HYDRO (France, Grenoble). The given computer system of hydraulic turbine speed control guarantees trouble-free operation in case of load deviation and power failures. A fully automatic method of controlling the hydraulic unit is possible, in which the computer system controls the turbine independently, based on the parameters of the hydraulic unit operation taken into account by the sensors, in accordance with the program of the control computer. The control system constantly monitors the operation of the hydraulic turbine, adjusts its speed according to the load, performs adequate control operations. The analysis of the operation of the circuits is carried out, taking into account the specifics of the functioning of the regulation system. A mathematical model of the hydromechanical part of the regulator is considered for assessing the quality indicators of transient processes occurring in the process of starting, stopping and reversing a hydraulic turbine. It is shown that the development of theory and design methods using both approaches, mathematical models and control algorithms aimed at increasing the positioning accuracy and reliability of hydropneumatic systems with a possible simplification of circuit solutions is an important task aimed at obtaining a significant economic effect when solving this most important problem. The results obtained prove that the use of a positional hydraulicpneumatic drive for building a hydraulic turbine speed control system with discrete and discrete-analogue control makes it possible to synthesize a hydraulic pneumatic drive with high positioning accuracy, without the use of expensive hydraulic valves with proportional control.

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Section: (α Sin α)unclassified

Turbine Speed Control

Hasiuk

2022

HM and HU

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Effect of 3D Shape of Pump-Turbine Runner Blade on Flow Characteristics in Turbine Mode

Rusanov¹,

Subotin²,

Khoryev³

et al. 2022

J. of Mech. Eng.

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The effect of blade spatial profiling with the help of tangential blade lean of Francis pump-turbine runner with heads up to 200 m on the flow structure and energy characteristics was numerically investigated. A flow part model of Francis pump-turbine of the Dniester pumped storage plant was adopted as original version. Two new blade systems were designed, which differed from the original version by mutual position of cross-sections in tangential direction: with positive and negative lean, while the shape of the cross-sections themselves remained unchanged. Modeling of the viscous incompressible flow in calculation domain, which contains one channel of the guide vane and the runner, for three variants of flow parts, was performed using the IPMFlow software based on numerical integration of the Reynolds equations with an additional term containing artificial compressibility. To take into account the turbulent effects, the SST differential two-parameter turbulence model of Menter is applied. Numerical integration of the equations is carried out using an implicit quasi-monotonic Godunov scheme of second order accuracy in space and time. The study was carried out for models with runner diameter of 350 mm in a wide range of guide vane openings at reduced rotation frequencies corresponding to the minimal, design and maximal heads of the station. A comparison of pressure fields and velocity vectors in the runners, pressure graphs on runner blades, distribution of velocity components at inlet to a draft tube, and efficiency of three variants of flow parts are presented. It was concluded that calculation domain with the new RK5217M2 runner with negative tangential lean has the best characteristics. An experimental study of three runners on a hydrodynamic stand are planned

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Analytical Method of Profiling Axial-Radial Compressor Impellers

Cited by 2 publications

References 6 publications

Turbine Speed Control

Turbine Speed Control

Effect of 3D Shape of Pump-Turbine Runner Blade on Flow Characteristics in Turbine Mode

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