scholarly journals Three-Dimensional Prescribed Velocity Blade Row Design

1990 ◽  
Author(s):  
V. Molnar ◽  
F. Ridzon ◽  
V. Adame
Keyword(s):  
Surface Modification ◽  
Velocity Distribution ◽  
Flow Velocity ◽  
Three Dimensional ◽  
Blade Profile ◽  
Profile Modification ◽  
Flow Surface ◽  
Blade Row ◽  
Actual Flow ◽  
Turbomachine Blade

A method for 3D turbomachine blade row design is presented as a subsequent tasks loop. The design follows the concept of the S1 and S2 streamsurfaces. A set of S1 surfaces is used for blade profile modification and a S2 mid-surface is used for hub and casing flow surface modification. A difference between target and actual flow velocity distribution is used to control iteration procedures for succesive geometry changes of an initial (original) blade row geometry. The design subroutines are added to standard direct codes. Results for several design cases are presented and discussed.

scholarly journals Analysis of the Flow Pattern and Flow Rectification Measures of the Side-Intake Forebay in a Multi-Unit Pumping Station

Water ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2025
Author(s):  
Ahmed Nasr ◽  
Fan Yang ◽  
Yiqi Zhang ◽  
Tieli Wang ◽  
Mahmoud Hassan
Keyword(s):  
Numerical Simulation ◽  
Velocity Distribution ◽  
Flow Velocity ◽  
Flow Pattern ◽  
Three Dimensional ◽  
Operating Efficiency ◽  
Water Tank ◽  
Three Dimensional Model ◽  
Pumping Station ◽  
Area Reduction

To improve the problem of turbulence in the forebay of the lateral inlet pumping station, a typical lateral inlet pumping station project in Xuzhou, Jiangsu Province, China was taken as the research object. The forebay of the pumping station is a building connecting the river channel and the pumping station into the water tank. Based on the Reynolds-averaged Navier-Stokes (RANS) law and the turbulence model, the computational fluid dynamics method (CFD) technology compares and analyzes the numerical simulation with or without rectification measures for the forebay of the lateral intake pumping station when multiple units are operating. The three-dimensional model was created by SolidWorks modeling software and the numerical simulation simulated by CFX-ANSYS. To alter the flow pattern in the forebay of the pumping station, various rectification measures were chosen. Internal rectification flow patterns in the forebay under multiple plans, uniformity of flow velocity distribution in the measuring section, and vortex area reduction rates are investigated and compared. Based on the analysis and comparison of numerical simulation results, when the parabolic wall and some rectification piers are set significantly it improves the flow pattern of the forebay of the lateral inlet pumping station. It also makes the flow pattern of the inlet pool better and increases the uniformity of the flow velocity distribution by 8%. Further, it reduced the vortex area by 70%, effectively improving the operating efficiency of the pump. The research results of this paper provide a technical reference for the improvement of the flow pattern in the forebay of the lateral inlet pumping station.

The Design of an Advanced Civil Fan Rotor

1987 ◽  
Vol 109 (3) ◽  
pp. 340-345 ◽  
Author(s):  
R. B. Ginder ◽  
W. J. Calvert
Keyword(s):  
High Efficiency ◽  
Three Dimensional ◽  
Internal Flow ◽  
Blade Profile ◽  
Transonic Compressor ◽  
Blade Row ◽  
New Type ◽  
Overall Performance ◽  
Calculation System ◽  
Asme Paper

A recent ASME paper by the authors described a quasi-three-dimensional calculation system for transonic compressor blade rows. The system predicts both the internal flow field and the overall performance of the blade row. It therefore enables the compressor engineer to optimize the blade shapes in order to improve the design point efficiency. This is explored in the present paper. A new type of blade profile has been developed to allow sufficient freedom for the optimization. Application to the design of a high-efficiency, transonic civil fan rotor is discussed.

scholarly journals Velocity Field Characteristics at the Inlet to a Pipe Culvert

2014 ◽  
Vol 61 (3-4) ◽  
pp. 127-140 ◽  
Author(s):  
Tomasz Kolerski ◽  
Paweł Wielgat
Keyword(s):  
Velocity Field ◽  
Velocity Distribution ◽  
Flow Velocity ◽  
Flow Structure ◽  
Laboratory Tests ◽  
Three Dimensional ◽  
Acoustic Doppler Velocimeter ◽  
Reynolds Stresses ◽  
Instantaneous Flow ◽  
Significant Damage

Abstract A poorly designed culvert inlet structure causes scouring, which can lead to the collapse of the culvert and significant damage to the neighboring land. A set of laboratory tests was evaluated to examine velocity distribution at the culvert inlet. A three-dimensional acoustic Doppler velocimeter was used to measure instantaneous flow velocity upstream of the culvert. The analysis of mean velocities, turbulence strength, and Reynolds stresses was performed to understand the flow structure near the culvert entrance.

scholarly journals A Fast Two-Dimensional Numerical Method for the Wake Simulation of a Vertical Axis Wind Turbine

Energies ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 49
Author(s):  
Zheng Yuan ◽  
Jin Jiang ◽  
Jun Zang ◽  
Qihu Sheng ◽  
Ke Sun ◽  
...  
Keyword(s):  
Velocity Distribution ◽  
Numerical Method ◽  
Three Dimensional ◽  
Particle Method ◽  
Vortex Method ◽  
Vertical Axis ◽  
Two Dimensional ◽  
Vertical Axis Wind Turbine ◽  
Wake Effect ◽  
Array Design

In the array design of the vertical axis wind turbines (VAWT), the wake effect of the upstream VAWT on the downstream VAWT needs to be considered. In order to simulate the velocity distribution of a VAWT wake rapidly, a new two-dimensional numerical method is proposed, which can make the array design easier and faster. In this new approach, the finite vortex method and vortex particle method are combined to simulate the generation and evolution of the vortex, respectively, the fast multipole method (FMM) is used to accelerate the calculation. Based on a characteristic of the VAWT wake, that is, the velocity distribution can be fitted into a power-law function, a new correction model is introduced to correct the three-dimensional effect of the VAWT wake. Finally, the simulation results can be approximated to the published experimental results in the first-order. As a new numerical method to simulate the complex VAWT wake, this paper proves the feasibility of the method and makes a preliminary validation. This method is not used to simulate the complex three-dimensional turbulent evolution but to simulate the velocity distribution quickly and relatively accurately, which meets the requirement for rapid simulation in the preliminary array design.

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