Schlüsselwörter
(Englisch)
|
Aerodynamics; heat transfer; film cooling; unsteady effects; aerodynamic clocking; stage interfaces; inlet temperature profiles; 3D CFD and experiments
|
Alternative Projektnummern
(Englisch)
|
EU project number: BE97-440
|
Forschungsprogramme
(Englisch)
|
EU-programme: 4. Frame Research Programme - 2.1 Industrial and materials technologies
|
Kurzbeschreibung
(Englisch)
|
See abstract
|
Partner und Internationale Organisationen
(Englisch)
|
Rolls-Royce, Snecma, MTU, Alfa Romeo Avio, Fiat Avio, ITP, DERA, Universität Karlsruhe, Università digli studi di Firenze, University of Limerick, EPFL, University of Oxford , VKI, ALSTOM, BMW-RR, Turbomeca, ABB
|
Abstract
(Englisch)
|
The overall objectives of the project are to understand the complex aero~thermal phenomena generated in cooled high pressure, intermediate pressure or low pressure turbines, to build the associated data bases and to facilitate the validation of improved Computational fluid Dynamics )CFD) methos. This information is urgently needed for aero-engine and gas turbine companies to improve turbine performance in terms reliability, safety and efficiency.
The TATEF programme consists of four major tasks.; (a) Temperature distortion and interaction effects in turbines, (b) Aer-thermal of HP turbine; (c) Fundamental film cooling studies, (d) CFD calculations. The contribution of ABB Alstom Power (CH) to these tasks are to support and collaborate on task (a) and to undertake the relevant work programme with in the film cooling and CFD calculation sub-tasks.
As part of the industrial CFD calculations ABB Alstom Power (Ch) will undertake CFD calculations for the DERA test turbine which will include; (a) Single Blade row calculations DERA NGV with cooling, (b) Stage calculation - DERA turbine with cooling, and (c) Unsteady calculation - DERA turbine stage.
To date, the DERA test turbine vane and blade geometry have been obtained and the data prepared for CFD mesh generation and CFD computations. The numerical techniques and tools consist in using hybrid meshes technology grid generation through the Centaur code. The FLUENT 5.0 code has been considered for the flow solution, as well as for the post-processing phase. Computations concerning the vane and the blade have been taken separately.
For the DERA MT1 Single vane, a basic hybrid grid of i.90 million cells has been generated with all coolant passages and holes. A fluid flow and heat transfer solution has been computed with the experimental reference high air conditions. The comparisons between the predicted and measured coolant mass flows showed very good agreement. Additionally the computed surface pressure were also very well predicted giving confidence in the computations. The computed heat transfer results qualitatively agrees surprisingly well on the suction side, and on the last 60% of the pressure side, following consistently the experimental data, with 30 to 40% quantitative over-prediction. The over-prediction is much more severe in the first 40% of the pressure side. This might be due to the fact that the y+ requirement (y+>30) for the use of a wall function is not fulfilled in this region. When y+ smaller than 20 are used, some severe over-predictions of heat transfer levels are usually encountered, which consistent with our computation. A refined mesh (2.17 million cells) around the mid-span has been generated in order to see whether refining the mesh along the vane will improve the heat transfer predictions.
For the DERA experimental single blade, a basic grid of 944,000 cells has been generated and the high-air experimental conditions have been simulated. To date the coolant mass flows are compared to the experiment which showed good agreement with the experimental data.
The fundamental film cooling work on this programme which forms part of the Brite-Euram Aeromechanical Design of Turbine Blades (ADTURB) - (BBW -Nr. 95,0058-2) is reported separately under the ADTURB Progress report.
|
Datenbankreferenzen
(Englisch)
|
Swiss Database: Euro-DB of the
State Secretariat for Education and Research
Hallwylstrasse 4
CH-3003 Berne, Switzerland
Tel. +41 31 322 74 82
Swiss Project-Number: 97.0367-1
|
