Aerodynamic and Performance Studies of a Three-Stage High Pressure Research Turbine With 3-D - Blades, Design Point and Off-Design Experimental Investigations

2000 ◽  
Author(s):  
M. T. Schobeiri ◽  
J. L. Gilarranz ◽  
E. S. Johansen
Keyword(s):  
High Pressure ◽  
Performance Studies ◽  
Experimental Investigations ◽  
Performance Measurements ◽  
Multi Stage ◽  
Speed Range ◽  
Design Speed ◽  
And Performance ◽  
Operating Points ◽  
Performance Behavior

This paper deals with the aerodynamic and performance behavior of a three-stage high pressure research turbine with 3-D curved blades at its design and off-design operating points. The research turbine configuration incorporates six rows beginning with a stator row. Interstage aerodynamic measurements were performed at three stations, namely downstream of the first rotor row, the second stator row, and the second rotor row. Interstage radial and circumferential traversing presented a detailed flow picture of the middle stage. Performance measurements were carried out within a rotational speed range of 75% to 116% of the design speed. The experimental investigations have been carried out on the recently established multi-stage turbine research facility at the Turbomachinery Performance and Flow Research Laboratory, TPFL, of the Texas A&M University.

scholarly journals Aerodynamic and Performance Behavior of a Three-Stage High Efficiency Turbine at Design and Off-Design Operating Points

2004 ◽  
Vol 10 (1) ◽  
pp. 33-44
Author(s):  
M. T. Schobeiri ◽  
J. L. Gilarranz ◽  
E. S. Johansen
Keyword(s):  
High Efficiency ◽  
Experimental Investigations ◽  
Performance Measurements ◽  
Research Facility ◽  
Multi Stage ◽  
Speed Range ◽  
Design Speed ◽  
And Performance ◽  
Operating Points ◽  
Performance Behavior

This article deals with the aerodynamic and performance behavior of a three-stage high pressure research turbine with 3-D curved blades at its design and off-design operating points. The research turbine configuration incorporates six rows beginning with a stator row. Interstage aerodynamic measurements were performed at three stations, namely downstream of the first rotor row, the second stator row, and the second rotor row. Interstage radial and circumferential traversing presented a detailed flow picture of the middle stage. Performance measurements were carried out within a rotational speed range of 75% to 116% of the design speed. The experimental investigations have been carried out on the recently established multi-stage turbine research facility at the Turbomachinery Performance and Flow Research Laboratory,TPFL, of Texas A&M University.

A Comparative Aerodynamic and Performance Study of a Three-Stage High Pressure Turbine With 3-D Bowed Blades and Cylindrical Blades

2004 ◽  
Author(s):  
M. T. Schobeiri ◽  
A. Suryanarayanan ◽  
C. Jermann ◽  
T. Neuenschwander
Keyword(s):  
High Pressure ◽  
Initial Conditions ◽  
Pressure Ratio ◽  
Experimental Investigations ◽  
Performance Study ◽  
Pressure Loss Coefficient ◽  
Design Speed ◽  
And Performance ◽  
Turbine Design ◽  
Total Pressure Loss Coefficient

To investigate the effect of the blade geometry on blade total pressure loss coefficient, efficiency, and performance, a comparative study is presented that deals with the aerodynamic and performance behavior of three-stage high pressure research turbine utilizing two different blade types. Keeping the initial conditions and the pressure ratio the same, two different rotors with the same hub and tip diameters are experimentally investigated. The first rotor incorporates 3-D convexly bowed blades, where as the second one utilizes a set of fully cylindrical blades. Using shrouded rotors and stators, the stator rings are correspondingly configured. The research turbine incorporates six rows beginning with a stator row. Interstage aerodynamic measurements are performed at design speeds at three stations, namely downstream of the first rotor row, the second stator row, and the second rotor row. For both rotors, the interstage radial and circumferential traversing present detailed flow pictures of the middle stage. Aerodynamic measurements were carried out at the turbine design speed. The experimental investigations have been carried out on a HP 3-stage gas turbine research facility at the Turbomachinery Performance and Flow Research Laboratory of Texas A&M University.

Investigating the Cause of Computational Fluid Dynamics Deficiencies in Accurately Predicting the Efficiency and Performance of High Pressure Turbines: A Combined Experimental and Numerical Study

2012 ◽  
Vol 134 (10) ◽  
Author(s):  
Meinhard T. Schobeiri ◽  
S. Abdelfattah ◽  
H. Chibli
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
High Pressure ◽  
Numerical Study ◽  
Turbine Rotor ◽  
Sensitivity Study ◽  
Numerical Results ◽  
Performance Measurements ◽  
And Performance ◽  
The Individual

Despite the tremendous progress over the past three decades in the area of turbomachinery computational fluid dynamics, there are still substantial differences between the experimental and the numerical results pertaining to the individual flow quantities. These differences are integrally noticeable in terms of major discrepancies in aerodynamic losses, efficiency, and performance of the turbomachines. As a consequence, engine manufacturers are compelled to frequently calibrate their simulation package by performing a series of experiments before issuing efficiency and performance guaranty. This paper aims at identifying the quantities, whose simulation inaccuracies are preeminently responsible for the aforementioned differences. This task requires (a) a meticulous experimental investigation of all individual thermofluid quantities and their interactions, resulting in an integral behavior of the turbomachine in terms of efficiency and performance; (b) a detailed numerical investigation using appropriate grid densities based on simulation sensitivity; and (c) steady and transient simulations to ensure their impact on the final numerical results. To perform the above experimental and numerical tasks, a two-stage, high-pressure axial turbine rotor has been designed and inserted into the TPFL turbine research facility for generating benchmark data to compare with the numerical results. Detailed interstage radial and circumferential traversing presents a complete flow picture of the second stage. Performance measurements were carried out for design and off-design rotational speed. For comparison with numerical simulations, the turbine was numerically modeled using a commercial code. An extensive mesh sensitivity study was performed to achieve a grid-independent accuracy for both steady and transient analysis.

On the Reliability of RANS and URANS Numerical Results for High-Pressure Turbine Simulations: A Benchmark Experimental and Numerical Study on Performance and Interstage Flow Behavior of High-Pressure Turbines at Design and Off-Design Conditions Using Two Different Turbine Designs

2013 ◽  
Vol 135 (6) ◽  
Author(s):  
M. T. Schobeiri ◽  
S. Abdelfattah
Keyword(s):  
High Pressure ◽  
Numerical Study ◽  
Flow Behavior ◽  
Sensitivity Study ◽  
Numerical Results ◽  
Experimental Investigations ◽  
Predictive Capability ◽  
Two Stage ◽  
Flow Through ◽  
And Performance

Improved computational fluid dynamics tools based on Reynolds-averaged Navier–Stokes (RANS) equations have shown that the behavior of simple flow cases can be predicted with a reasonable degree of accuracy. Their predictive capability, however, substantially diminishes whenever major secondary vortices, adverse pressure gradients, and wake-boundary layer interactions are present. Flow through high-pressure (HP) turbine components uniquely incorporates almost all of the above features, interacting with each other and determining the efficiency and performance of the turbine. Thus, the degree of accuracy of predicting the flow through a HP turbine can be viewed as an appropriate benchmark test for evaluating the predictive capability of any RANS-based method. Detailed numerical and experimental investigations of different HP turbines presented in this paper have revealed substantial differences between the experimental and the numerical results pertaining to the individual flow quantities. This paper aims at identifying the quantities whose simulation inaccuracies are pre-eminently responsible for the aforementioned differences. This task requires (a) a meticulous experimental investigation of all individual thermofluid quantities and their interactions resulting in an integral behavior of the turbomachine in terms of efficiency and performance, (b) a detailed numerical investigation using appropriate grid densities based on simulation sensitivity, and (c) steady and transient simulations to ensure their impact on the final numerical results. To perform the above experimental and numerical tasks, two different HP turbines were investigated: (1) a two-stage turbine with moderately compound-leaned stator blades and (2) a three-stage turbine rotor with compound-leaned stator and rotor blades. Both turbines have been thoroughly measured and numerically simulated using RANS and URANS. Detailed interstage radial and circumferential traversing presents a complete flow picture of the second stage. Performance measurements were carried out for design and off-design rotational speeds. For comparison with numerical simulations, the turbines were numerically modeled using a commercially available code. An extensive mesh sensitivity study was performed to achieve a grid-independent accuracy for both steady and transient analysis. Comparison of RANS/URANS results with the experimental ones revealed differences in total pressure for the two-stage turbine of up to 5%. A significantly lower difference of less than 0.2% is observed for the three-stage turbine with specially designed blades to suppress the secondary flow losses. Analyzing the physical background of a RANS-based solver, it was argued that the differences of individual quantities exhibited in the paper were attributed to the deficiencies in dissipation and transition models.

Music as Performance: Living in the Immaterial World

2006 ◽  
Vol 47 (2) ◽  
pp. 261-269 ◽  
Author(s):  
Philip Auslander
Keyword(s):  
Cultural Studies ◽  
Performance Studies ◽  
Musical Performance ◽  
Musical Form ◽  
Theatre History ◽  
Actual Performance ◽  
Theatrical Representation ◽  
History Of ◽  
And Performance ◽  
Performance Behavior

As a performance scholar and music lover, I find it strange that the fields of theatre and performance studies historically have been reluctant to engage with musical performance. Even as theatrical a musical form as opera is generally excluded from the history of theatre, on the grounds that “the predominant force in opera was the music rather than the words,” as Vera Mowry Roberts, my theatre history professor, puts the case.1 Roberts points to the nonliterary character of music as the reason for the exclusion; I speculate that the perception of music not only as nonliterary but, more broadly, as nonmimetic may seem to place it outside the realm of theatrical representation. While performance-oriented scholars spurn music, music-oriented scholars generally spurn performance. Traditional musicologists remain focused on the textual dimensions of musical compositions, whereas scholars who look at music from the perspective of cultural studies are generally more concerned with audience and reception than with the actual performance behavior of musicians.

Stator Clocking Effects on 3D Flow in a Two-Stage Low-Pressure Turbine

2005 ◽  
Author(s):  
Jan E. Krysinski ◽  
Jaroslaw R. Blaszczak ◽  
Antoni Smolny
Keyword(s):  
Unsteady Flow ◽  
Low Pressure ◽  
Experimental Investigations ◽  
Two Stage ◽  
Flow Measurements ◽  
Low Pressure Turbine ◽  
Multi Stage ◽  
Technical University ◽  
And Performance ◽  
Vane Clocking

Detailed experimental investigations were conducted of the detailed flow structures in a model two-stage low-pressure turbine. The objective of this study is to gain more insight into phenomena affecting flow behaviour due to the indexing airfoil effects in multi-stage machines. To investigate the effect of the vane clocking on axial turbine efficiency and performance, an analysis of the experimental results of the steady and unsteady flow measurements throughout the flow field for different circumferential positions of the first stator is performed. Detailed flow pictures were measured for all measuring planes according to the radial and circumferential inter-row traversing. Aerodynamic measurements were compared to the turbine design speed and “classical” clocking position of the two stators. Herein, some steady and unsteady flow measurement results, and the external characteristics for different circumferential positions of the stator vanes are described. The experimental investigations presented in this paper were carried out since mid-nineties [1] on a 2-stage turbine research facility TM-3 at the Institute of Turbomachinery of Technical University of Lodz in close cooperation with Institute of Jet Propulsion and Turbomachinery of Technical University of Aachen, Germany.

scholarly journals Analysis of the Transonic Flow at the Inlet of a High Pressure Ratio Centrifugal Impeller

1998 ◽  
Author(s):  
Gernot Eisenlohr ◽  
Peter Dalbert ◽  
Hartmut Krain ◽  
Hartwig Pröll ◽  
Franz-Arno Richter ◽  
...  
Keyword(s):  
High Pressure ◽  
Flow Field ◽  
Pressure Ratio ◽  
Centrifugal Impeller ◽  
Performance Measurements ◽  
Design Procedures ◽  
Laser Measurements ◽  
High Pressure Ratio ◽  
Design Speed ◽  
Turbo Compressor

In an industrial research project of German and Swiss Turbo Compressor manufacturers a high pressure ratio centrifugal impeller was designed and investigated. Performance measurements and extensive laser measurements (L2F) of the flow field upstream, inside and downstream of the rotor have been carried out. In addition to that, 3D calculations have been performed, mainly for the design point. Some earlier results have been presented by Krain et al., 1995. With four different viscous 3D-solvers, used in companies of the group, calculations for the design speed were carried out to investigate the suitability of these programs in the various design procedures. Special attention was given to the area from rotor inlet up to the splitter blades. The results for the flow field obtained with the four viscous 3D-Solvers are compared with one another and with the L2F-measurements.

Cultural Labour

2019 ◽  
Author(s):  
Brahma Prakash
Keyword(s):  
Conceptual Framework ◽  
Performance Studies ◽  
Life Experience ◽  
Social Hierarchies ◽  
Folk Performance ◽  
And Performance ◽  
The Relationship

Folk performances reflect the life-worlds of a vast section of subaltern communities in India. What is the philosophy that drives these performances, the vision that enables as well as enslaves these communities to present what they feel, think, imagine, and want to see? Can such performances challenge social hierarchies and ensure justice in a caste-ridden society? In Cultural Labour, the author studies bhuiyan puja (land worship), bidesia (theatre of migrant labourers), Reshma-Chuharmal (Dalit ballads), dugola (singing duels) from Bihar, and the songs and performances of Gaddar, who was associated with Jana Natya Mandali, Telangana: he examines various ways in which meanings and behaviour are engendered in communities through rituals, theatre, and enactments. Focusing on various motifs of landscape, materiality, and performance, the author looks at the relationship between culture and labour in its immediate contexts. Based on an extensive ethnography and the author’s own life experience as a member of such a community, the book offers a new conceptual framework to understand the politics and aesthetics of folk performance in the light of contemporary theories of theatre and performance studies.

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