Determination of the Effect of the Angle of the Wicket Gate on Turbine Efficiency in Francis Type Turbines by CFD Analysis

2015 ◽  
Vol 42 (1) ◽  
pp. 1-12
Author(s):  
Adnan Sozen ◽  
Selcuk Kecel ◽  
H. Guclu Yavuzcan
Keyword(s):  
Cfd Analysis ◽  
Turbine Efficiency

Prediction of the Flow and Force Characteristics of Safety Relief Valves

2006 ◽  
Author(s):  
W. Dempster ◽  
C. K. Lee ◽  
J. Deans
Keyword(s):  
Operating Conditions ◽  
Cfd Analysis ◽  
Flow Conditions ◽  
Relief Valve ◽  
Good Correspondence ◽  
Geometry Modeling ◽  
Valve Opening ◽  
Satisfactory Prediction ◽  
Force Characteristics

The design of safety relief valves depends on knowledge of the expected force-lift and flow-lift characteristics at the desired operating conditions of the valve. During valve opening the flow conditions change from seal-leakage type flows to combinations of sub-sonic and supersonic flows It is these highly compressible flow conditions that control the force and flow lift characteristics. This paper reports the use of computational fluid dynamics techniques to investigate the valve characteristics for a conventional spring operated 1/4” safety relief valve designed for gases operating between 10 and 30 bar. The force and flow magnitudes are highly dependent on the lift and geometry of the valve and these characteristics are explained with the aid of the detailed information available from the CFD analysis. Experimental determination of the force and flow lift conditions has also been carried out and a comparison indicates good correspondence between the predictions and the experiment. However, attention requires to be paid to specific aspects of the geometry modeling including corner radii and edge chamfers to ensure satisfactory prediction.

Improving the Efficiency of the Trent 500 HP Turbine Using Non-Axisymmetric End Walls: Part II — Experimental Validation

2001 ◽  
Author(s):  
M. G. Rose ◽  
N. W. Harvey ◽  
P. Seaman ◽  
D. A. Newman ◽  
D. McManus
Keyword(s):  
Design Methodology ◽  
Experimental Validation ◽  
Axial Flow ◽  
Cfd Analysis ◽  
Hot Wire ◽  
Flow Conditions ◽  
Linear Cascade ◽  
Turbine Efficiency ◽  
End Wall ◽  
Turbine Model

Part I of this paper described how the HP turbine model rig of the Rolls-Royce Trent 500 was redesigned by applying non-axisymmetric end walls to both the vane and blade passages, whilst leaving the turbine operating point and overall flow conditions unaltered. This paper describes the results obtained from testing of the model rig and compares them with those obtained for the datum design (with conventional axisymmetric end walls). Measured improvements in the turbine efficiency are shown to be in line with those expected from the previous linear cascade research at Durham University, see Harvey et al. [1] and Hartland et al. [2]. These improvements are observed at both design and off-design conditions. Hot wire traverses taken at the exit of the rotor show, unexpectedly, that the end wall profiling has caused changes across the whole of the turbine flow field. This result is discussed making reference to a preliminary 3-D CFD analysis. It is concluded that the design methodology described in part I of this paper has been validated, and that non-axisymmetric end wall profiling is now a major new tool for the reduction of secondary loss in turbines (and potentially all axial flow turbomachinery). Further work, though, is needed to fully understand the stage (and multistage) effects of end wall profiling.

Experience in the Use of a Digital Computer for Predicting Steam-Turbine Performance

1964 ◽  
Vol 179 (1) ◽  
pp. 307-342
Author(s):  
R. U. McCrae ◽  
A. Montague ◽  
M. Douglass
Keyword(s):  
Energy Balance ◽  
Steam Turbine ◽  
Turbine Generator ◽  
Design And Optimization ◽  
Turbine Efficiency ◽  
Turbine Performance ◽  
Experienced Programmer ◽  
Turbine Design ◽  
Considerable Detail

This paper describes a number of programmes for digital computers that have been developed by the authors' firm to eliminate many of the tedious hand calculations which are encountered in the preliminary stages of steam-turbine and condenser design. By their use a considerable amount of the designers' time is saved and fatigue is reduced. These programmes also eliminate mistakes and inaccuracies which may occur in long calculations made by hand. The programmes described have been chosen as being representative of the range of programmes used in preliminary turbine design and optimization and are as follows: a programme to enable steam properties to be calculated, based on the formulae given in the Keenan and Keyes Steam Tables; a programme which can be used to determine the efficiency of small industrial turbines; a feed-heating programme which will carry out the calculations necessary to determine the preliminary energy balance for a feed-heating cycle; a detailed energy-balance programme incorporating turbine-efficiency calculations; a condenser-optimization programme for determination of the ideal parameters to be used in the design of a condenser. The programmes are arranged so that unskilled operators can run them on the computer without the help of an experienced programmer. Facilities are also made available for writing programmes in a simplified form called ‘autocode’ which can be used by an engineer after the briefest of trainings. Some programmes are described in considerable detail to assist others who may wish to write a similar programme or to compare them with programmes of their own. All these programmes have been in regular use for more than three years and have greatly enlarged the scope of investigations which may be carried out in the project stage of the design of a steam-turbine generator and associated power-station equipment.

scholarly journals Advancement of Turbine Aerodynamic Design Techniques

1993 ◽  
Author(s):  
Lisa W. Griffin ◽  
Frank W. Huber
Keyword(s):  
Fluid Dynamics ◽  
State Of The Art ◽  
Cfd Analysis ◽  
Aerodynamic Design ◽  
Turbine Efficiency ◽  
Component Design ◽  
Pump Stage ◽  
Computational Fluid Dynamics Cfd ◽  
The Government ◽  
And Performance

The Consortium for Computational Fluid Dynamics (CFD) Application in Propulsion Technology has been created at NASA/MSFC. Its purpose is to advance the state-of-the-art of CFD technology, to validate CFD codes and models, and to demonstrate the benefits attainable through the application of CFD in component design. Three teams are currently active within the Consortium: (1) the Turbine Technology Team, (2) the Pump Stage Technology Team, and (3) the Combustion Devices Technology Team. The goals, dynamics, and activities of the Turbine Team are the subjects of this paper. The Consortium is managed by NASA. The Turbine Team is co-coordinated by a NASA representative from the CFD area and an industry (Pratt & Whitney) representative from the area of turbine aerodynamic design. Membership of the Turbine Team includes experts in design, analysis, and testing from the government, industry, and academia. Each member brings a unique perspective, expertise, and experience to bear on the team’s goals of improving turbine efficiency and robustness while reducing the amount of developmental testing. To this end, an advanced turbine concept has been developed within the team using CFD as an integral part of the design process. This concept employs unconventionally high turning blades and is predicted to provide cost and performance benefits over traditional designs. This concept will be tested in the MSFC Turbine Airflow Facility to verify the design and to provide a unique set of data for CFD code validation. Currently, the team is developing and analyzing methods to reduce secondary and tip losses to further enhance turbine efficiency. The team has also targeted volute development as an area that could benefit from detailed CFD analysis.

scholarly journals Numerical Simulation of the Hydrodynamics of Some Sectors of the Prute River

2019 ◽  
Vol 70 (3) ◽  
pp. 902-905
Author(s):  
Galina Marusic ◽  
Valeriu Panaitescu
Keyword(s):  
Water Pollution ◽  
Fluid Dynamics ◽  
Numerical Simulation ◽  
Flow Characteristics ◽  
Aquatic Systems ◽  
Cfd Analysis ◽  
Computational Fluid Dynamics Cfd ◽  
Prut River

This paper addresses issues related to the determination of hydrodynamics of aquatic systems, with the application of computational fluid dynamics (CFD) analysis. The importance of knowing the hydrodynamics of aquatic systems for solving water pollution problems, as well as their prevention, is discussed. A case study regarding the determination of the water flow characteristics using CFD for some sectors of the Prut river is presented.

Determination of surface catalysis on copper oxide in a shock tube using thermochemical nonequilibrium CFD analysis

2022 ◽  
Author(s):  
Yosheph Yang ◽  
Petha Sethuraman Vignesh Ram ◽  
Haedong Kim ◽  
Jae Gang Kim
Keyword(s):  
Shock Tube ◽  
Copper Oxide ◽  
Cfd Analysis ◽  
Surface Catalysis

Determination of Power of High Pressure Steam Turbine Blading Using CFD Analysis

2013 ◽  
Vol 3 (4) ◽  
pp. 25-32
Author(s):  
M. Sivaramakrishnaiah ◽  
◽  
P. Nanda Kumar ◽  
P.S. Ravi Kumar ◽  
◽  
...  
Keyword(s):  
High Pressure ◽  
Steam Turbine ◽  
Cfd Analysis ◽  
High Pressure Steam ◽  
Pressure Steam ◽  
Turbine Blading

Stage Efficiency, Cumulative Heat, and Reheat Factor of Steam Turbines

1938 ◽  
Vol 140 (1) ◽  
pp. 399-452 ◽  
Author(s):  
D. M. Smith
Keyword(s):  
Steam Turbine ◽  
Pressure Loss ◽  
Steam Turbines ◽  
Converse Problem ◽  
Turbine Efficiency ◽  
Methods Of Calculation ◽  
Stage Efficiency

The paper discusses methods of calculation of stage efficiency, cumulative heat, and reheat factor for a given steam turbine condition curve, together with the converse problem of the determination of the condition curve and reheat factor when the stage efficiency is given. The complications due to pressure loss, resuperheating and tapping for feed heating are considered. A set of graphs calculated by these methods is provided for reading off the relations between turbine efficiency, stage efficiency, and reheat factor with condition curves based on constant dry stage efficiency of small stages and standard wetness loss correction (1 per cent loss per 1 per cent wetness).

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