Analysis of the Three-Dimensional Accelerating Flow in A Mixed Turbine Rotor

Chelabi, Mohammed Amine; Basova, Yevheniia; Hamidou, M.K.; Dobrotvorskiy, Sergey

doi:10.21272/jes.2021.8(2).d1

Cited by 5 publications

(6 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The equations of dimensionless pressure, moment, and power characteristics, respectively, for the elementary lattice of the runner in a dimensionless form were used. , D  and Q [8,9]:…”

Section: Dimensionless Theoretical Characteristics Of the Runner Elem...mentioning

confidence: 99%

“…From the analysis of works on the study of the working process of reversible hydraulic machines, it follows that at present the issue of creating water passages of reversible hydraulic machines is quite relevant [5][6][7][8]. Also of interest are an investigation of new rotor blade designs conceived to produce higher exit relative kinetic energy of a mixed flow turbine [9][10]. When developing a reversible hydraulic machine water passage, involves carrying out numerous computational studies that are necessary to find the influence of geometric and mode parameters on the parameters of the optimal operation mode and energy characteristics.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Study of the Characteristics of the Runner Blade System of a Hydraulic Machine

2022

IJOMAM

View full text Add to dashboard Cite

The paper is devoted to the development of a methodology for determining and analyzing the main characteristics of the elementary lattices of the runner blade system of a reversible hydraulic machine. Equations that describe the kinematics of the flow in absolute and relative motion at the inlet and outlet of the runner are given. This method of calculation and analysis of elementary lattice characteristics makes it possible to evaluate their influence on the runner of a reversible hydraulic machine, which helps to assess the degree of consistency of elementary lattices that make up the runner spatial lattice. To study the operating process, the equations of dimensionless coefficients of head, moment, and power were applied to the runner's elementary lattice. The relationship between the hydrodynamic, kinematic, and energy parameters of elementary lattices and the spatial lattice of the runner is shown. The regularities of changes in the hydrodynamic characteristics of elementary lattices are determined, which makes it possible to determine the loss coefficient of the runner in the optimal operation mode and to evaluate the consistency of the runner elementary lattices with each other. Numerical modeling of a 3D model of the ORO200 runner was carried out, resulting in a spatial model of the fluid flow. The distribution of static pressure and velocity components is obtained. All these approaches help to obtain the nature of fluid flow in the blade system.

show abstract

“…The equations of dimensionless pressure, moment, and power characteristics, respectively, for the elementary lattice of the runner in a dimensionless form were used. , D  and Q [8,9]:…”

Section: Dimensionless Theoretical Characteristics Of the Runner Elem...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study of the Characteristics of the Runner Blade System of a Hydraulic Machine

2022

IJOMAM

View full text Add to dashboard Cite

show abstract

“…Leonard et al [42] analyzed the design and performance of mixed-flow turbine rotors with extended blade chords. Chelabi et al [43][44][45] studied the effects of the cone, inlet, and deviation blade angles on mixed inflow turbine performances and analyzed the three-dimensional accelerating flow in a mixed turbine rotor. A smaller number of blades was suggested for a cone angle of 20 • in the case of parallel surfaces [43] because of parameters, such as a large surface, weight, inertia, and a wide range of operation, for maximum efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…Also, the machine experienced [44] a 3.71% and 3.67% increase in work output and efficiency, respectively. It has been established [45] that for larger absolute exit kinetic energies, for values of deviation blade angle between −10 • and −20 • , an exhaust diffuser is recommended to recover a part of it into a greater expansion ratio. Kononenko et al [46] examined the deflections and frequency in the milling of thin-walled parts with variable low stiffness; Dobrotvorskiy et al [47] developed an optimum thin-walled parts milling parameters calculation technique.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Main Geometrical Parameters on the Design and Performance of Mixed Inflow Turbines

Chelabi¹,

Dobrotvorskiy

Basova

et al. 2022

Applied Sciences

View full text Add to dashboard Cite

The blade shape is of great interest to hybrid turbine designers, due to its significant and direct impact on turbine performance. The inlet and outlet diameters of the vane affect the size of the rotor, which is limited because of the small space available in internal combustion engines. The effect of the ratio of the average inlet diameter and the average exducer inlet diameter on the performance of a mixed inlet turbine will be the focus of this study, which consists of two cases included herein for the purpose of illustrating the means of improving rotor performances and controlling the flow mass rate. In the first case, we achieved this by changing the average diameter of the exducer inlet, while, in the second one, we achieved this by changing the average inlet diameter. Additionally, the angles of the inlet and outlet blades were recalculated to preserve the same blade profile and to eliminate the effect of curvilinearity. It was noted that the shape of the blade was very sensitive to changes in the ratio of the investigated diameters, and—in both cases—interesting results were obtained. First, an increase in output work and in total static isentropic efficiency by 2.16% and 2.15%, respectively, was generated, with a saving of 3.52% of the used mass flow and a lighter rotor compared to one that used to take up the same space by using fixed average inlet diameter blades. In the second case, there was an increase in the output work by 3.31%, and in the total static isentropic efficiency by 3.34%, but the rotor became heavier and required an increase in the mass flow used. Since inter-blade flows are very complex, three-dimensional and viscous—featuring various types of secondary and eddy flows—the CFX.15-CFD code was used in all models to solve the averaged Navier–Stokes equations.

show abstract

“…Chelabi et al [42] studied the effect of cone and inlet blade angles on mixed inflow turbine performance in two cases, the first for a fixed outlet section volute and the second for a variable outlet section volute which was parallel to the rotor leading edge, some geometric parameters were fixed to keep the same rotor casing. Authors [43] analyzed the threedimensional accelerating flow in a mixed turbine rotor. The studies [44,45] include research to ensure high-quality mechanical machining of turbine blades for regular operation.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Blade Angle Deviation on Mixed Inflow Turbine Performances

Chelabi¹,

Sága

Kuric

et al. 2022

Applied Sciences

View full text Add to dashboard Cite

The choice of blades for mixed turbines is to achieve the required deflection with minimal losses. In addition, it is necessary that the blade functions without a detachment in a wide area outside the nominal operating point of the machine. In the blade profile study, it is required to satisfy the conditions relating to fluid mechanics and those relating to the possibility of realization of construction. The work carried out presents the effect of the blade deviation angle on the geometric blade shape and the performance of the mixed inflow turbine on keeping the same rotor casing in order to improve its performances. It was remarked that the efficiency is proportional to the deviation angle’s increase, but the rotor became heavy. It has been determined that the effect of the blade deviation angle on mixed inflow performances decreases dramatically starting from the angle −20° for a 100% of machine load. It was urged to avoid relying on angles greater than −20 as values for blade deviation angles. The study noted that the maximum obtained in the output work and power is related to the highest the efficiency for a specific optimum design case (−35° of deviation blade angle) due to the increase in the contact surface between the blade and the fluid, but the problem is that the rotor gets a little heavy (4.37% weight gain). Among recommendations, attention was given to the more significant absolute exit kinetic energies, for values of deviation blade angle between -10° and −20°, where an exhaust diffuser is recommended to use to recover a part of it into a greater expansion ratio. These simulation results were obtained using a CFD calculation code-named CFX.15. This code allowed for the resolution of the averaged dynamic equations governing the stationary, compressible, and viscous internal flow.

show abstract

Analysis of the Three-Dimensional Accelerating Flow in A Mixed Turbine Rotor

Cited by 5 publications

References 26 publications

Study of the Characteristics of the Runner Blade System of a Hydraulic Machine

Study of the Characteristics of the Runner Blade System of a Hydraulic Machine

Influence of the Main Geometrical Parameters on the Design and Performance of Mixed Inflow Turbines

The Effect of Blade Angle Deviation on Mixed Inflow Turbine Performances

Contact Info

Product

Resources

About