Determination of Averaged Axisymmetric Flow Surfaces and Meridian Streamlines in the Centrifugal Pump Using Numerical Simulation Results

Bogdanović-Jovanović, Jasmina; Milenković, Dragica; Stamenković, Živojin; Spasić, Živan

doi:10.22190/fume170911026b

Cited by 4 publications

(3 citation statements)

References 8 publications

(13 reference statements)

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“…In the case of averaging without using common parameters before the cascade, the "history" of the flow is not taken into account, and only the parameters of the initial non-uniform flow are averaged in different ways [1][2][3][4][5][6]. In [2] determines axisymmetric flow, which is averaged through surfaces and meridian streamlines, [3] performs averaging based on mechanical work potential, [4] uses Favre-averaged Fourier-based methods with application to gas turbines, [5,6] also uses averaging techniques to evaluate turbomachine efficiency. A significant variety of gas flow averaging methods raises the question of their effectiveness and allows you to combine different approaches to improve their performance.…”

Section: Literature Reviewmentioning

confidence: 99%

Improved Hybrid Methods for Determining the Integral Characteristics of Turbomachine Nozzle Cascades

Lapuzin

Subotovich

Yudin

et al. 2021

Lecture Notes in Mechanical Engineering

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To determine the integral gas-dynamic characteristics of nozzle cascades of turbomachines, it is necessary to average the parameters of the threedimensional flow behind the cascade that is non-uniform along with the pitch and along with the height of the cascade. Two types of averaging methods are used. For the first type of methods, the flow parameters at the entrance to the cascade are not taken into account when averaging the parameters of a nonuniform flow behind the cascade. For the second type of methods (hybrid), the pressure behind the cascade is found from the condition of maintaining the enthalpy drop in the initial non-uniform three-dimensional and averaged flows. In a cylindrical flow, the hybrid method is usually used to determine the velocity coefficient. The main disadvantage of this method is the significantly overestimated mass flow mass rate and component onto the axial direction of the angular momentum. To improve the methods of the second type, it is proposed to replace the ratio of the components of the momentum with two parameters, namely: mass flow rate and the component of the moment of momentum on the axial direction. It allows determining the velocity coefficient and two angles for the averaged flow. It is shown that the second kinetic energy of the flow can be replaced by entropy and, thus, the velocity coefficient can be adjusted provided the complex quality criterion is kept constant.

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Section: Literature Reviewmentioning

confidence: 99%

Improved Hybrid Methods for Determining the Integral Characteristics of Turbomachine Nozzle Cascades

Lapuzin

Subotovich

Yudin

et al. 2021

Lecture Notes in Mechanical Engineering

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“…The efficiency of the fan depends on the shapes of the blade profiles, the blade itself, and the ratio of the diameters of the impeller hub and the shroud [2,6]. Numerical flow simulations in fans can determine the best shape profiles for achieving better efficiency of the fans, which can serve for further experimental tests [7,8,9]. Various commercial programs are available for numerical simulations.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Influence of the Doubly Curved Blade Profiles on the Reversible Axial Fan Characteristics

et al. 2020

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Abstract. In reversible axial fans a change in the direction of the impeller rotation is accompanied with a change in the direction of the working fluid flow. To satisfy the flow reversibility, the impeller blades are usually designed with straight symmetrical profiles. The flow reversibility may also be achieved by using asymmetrical blade profiles in which, to satisfy the equality of the leading and trailing angle of the profiles, the mean line of the profile has to have a double curvature in the shape of the stretched letter 'S'. The paper numerically investigates the influence of the doubly curved blade profiles on the reversible axial fan characteristics. Numerical simulations are carried out on an axial fan only with the impeller, with the blades that have double-curved mean line profiles for different values of the angles at the profile ends. For numerical simulation the ANSYS CFX software package is used. Results of the numerical simulation are shown in diagrams Δp(Q), h(Q) and P(Q) at different angles of the profile ends. On the basis of the simulation and analysis of the characteristics, appropriate conclusions are proposed, along with the most advantageous profile of the blades.

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“…With the development of computational fluid dynamics, more and more researchers predicted the internal flow and pressure fluctuation in pumps by numerical simulation. New calculation models and numerical methods have been developed and verified [3][4][5][6]. The results from numerical simulation can reveal detailed fluid information in impeller and volute, including pressure and streamline distributions, which are difficult to obtain in experiments.…”

Section: Introductionmentioning

confidence: 99%

Flow Characteristics in Volute of a Double-Suction Centrifugal Pump with Different Impeller Arrangements

et al. 2019

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As an important type of centrifugal pump, the double-suction pump has been widely used due to its high efficiency region and large flow rate. In the present study, the complex flow in volute of a double-suction centrifugal pump is investigated by numerical simulation using a re-normalization group (RNG) k-ε model with experimental validation. Axial flows are observed in volute near the impeller outlet and compared with four staggered angles. The net area-weighted average axial velocities decrease as the staggered angle increases. The axial flows are mainly caused by the different circumferential pressure distribution at the twin impeller outlet. The dominant frequencies of the axial velocities for different staggered angles are fBP and its harmonic. The pressure fluctuations in most regions of the volute are obtained by superimposing the pressure generated by the two impellers.

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Determination of Averaged Axisymmetric Flow Surfaces and Meridian Streamlines in the Centrifugal Pump Using Numerical Simulation Results

Abstract: Abstract. One of the most important aims in the turbo pump design is to achieve an optimal design of the pump impeller. The basic assumption in the design

Cited by 4 publications

References 8 publications

Improved Hybrid Methods for Determining the Integral Characteristics of Turbomachine Nozzle Cascades

Improved Hybrid Methods for Determining the Integral Characteristics of Turbomachine Nozzle Cascades

Numerical Investigation of the Influence of the Doubly Curved Blade Profiles on the Reversible Axial Fan Characteristics

Flow Characteristics in Volute of a Double-Suction Centrifugal Pump with Different Impeller Arrangements

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