Turbine Stator Well CFD Studies: Effects of Coolant Supply Geometry on Cavity Sealing Performance

2009 ◽  
Author(s):  
Antonio Andreini ◽  
Riccardo Da Soghe ◽  
Bruno Facchini
Keyword(s):  
Research Programme ◽  
Air Cooling ◽  
Sector Model ◽  
Engine Efficiency ◽  
Air Supply ◽  
Sealing Performance ◽  
Aero Engines ◽  
Set Up ◽  
Cooling Air

The increase of aero engines performance through the improvement of aerodynamic efficiency of main annulus flow is becoming more and more difficult to achieve. However there are still some devices that could be improved to enhance global engine efficiency. Particularly, investigations on the internal air cooling systems, may lead to a reduction of cooling air with a direct benefit to the overall performance. At the same time, further investigations on heat transfer mechanisms within turbine cavities may help to optimize cooling air flows saving engine life duration. This paper presents a CFD study aimed at the characterization of the effects of different geometries for cooling air supply within turbine cavities on wall thermal effectiveness and sealing mass flow rate. Several sealing air supply geometries were considered in order to point out the role of cooling air injection position, swirl number and jet penetration on the cavities sealing performance. The study was set up on a two-stage axial turbine rig developed in a research programme on internal air systems funded by EU (Main Annulus Gas Path Interactions - MAGPI). Steady state calculations were performed using two different computational domains: the first consists in a sector model of the whole turbine including the second stator well, while the second is a cut-down model of the stator well. Thanks to the simplified geometry of the test rig with respect to actual engines, the study has pointed out clear design suggestions regarding the effects of geometry modification of cooling air supply system.

Turbine Stator Well CFD Studies: Effects of Coolant Supply Geometry on Cavity Sealing Performance

2010 ◽  
Vol 133 (2) ◽  
Author(s):  
Antonio Andreini ◽  
Riccardo Da Soghe ◽  
Bruno Facchini
Keyword(s):  
Air Cooling ◽  
Sector Model ◽  
Engine Efficiency ◽  
Air Supply ◽  
Sealing Performance ◽  
Computational Fluid Dynamics Cfd ◽  
Cooling Air ◽  
Supply Systems

The increase of aeroengine performance through the improvement of aerodynamic efficiency of core flow is becoming more and more difficult to achieve. However, there are still some devices that could be improved to enhance global engine efficiency. Particularly, investigations on the internal air cooling systems may lead to a reduction of cooling air with a direct benefit to the overall performance. At the same time, further investigations on heat transfer mechanisms within turbine cavities may help to optimize cooling air flows, saving engine life duration. This paper presents a computational fluid dynamics (CFD) study aimed at the characterization of the effects of different geometries for cooling air supply within turbine cavities on wall thermal effectiveness and sealing mass flow rate. Several sealing air supply geometries were considered in order to point out the role of cooling air injection position, swirl number, and jet penetration on the cavities’ sealing performance. Steady state calculations were performed using two different computational domains: the first consists of a sector model of the whole turbine including the second stator well, while the second is a cut-down model of the stator well. Thanks to the simplified geometry of the test rig with respect to actual engines, the study has pointed out clear design suggestions regarding the effects of geometry modification of cooling air supply systems.

scholarly journals The Role of Changing Management in the Process Of Enhancing the strategic Marketing Planning in Jordanian Industry Sector (Model-Complement)

2017 ◽  
Vol 12 (5) ◽  
pp. 130
Author(s):  
Salman Mohammad Abulehyeh ◽  
Ali Falah Al-zoub
Keyword(s):  
Strategic Planning ◽  
Change Management ◽  
Investment Strategy ◽  
Strategic Marketing ◽  
Sector Model ◽  
Several Variables ◽  
Marketing Planning ◽  
Market Situation ◽  
Set Up

This study examines the role and importance of change management in enhancing and managing strategic marketing planning related to strategic problems characterized by depth and complications. This rather planning demands extensive and deep research concerns variables and capabilities of futuristic analysis of propositions and probabilities. Thus, planning designers are the critical suppliers to the organization. The importance of studying change management is stressed, as well as its role in enhancing the process of strategic planning which is essential for the organization in the future. This is the main subject of this study. A matrix including several variables has been set, being one of the tools of marketing strategic planning for the organization. These variables decide the extent of market attraction and its competitive position in different market situations. Additionally, another matrix was set up to determine the competitive capability of the organization. On this basis, the suitable investment strategy has been determined, according to each market situation, in relation to market attraction & the competitive capability of the organization. After finishing the marketing revision, evaluation of the organization's internal situation has been done as to the threats and opportunities in comparison to opportunities and threats in the external environment. Good management and investment in change management employed by food companies in the private Jordanian sector is still limited due to obstacles, limitations related to managers and leaderships as well as present technical, financial, and information capabilities.

The Role of High Temperature Gas Turbines in Power Generation

1968 ◽  
Author(s):  
J. F. Barnes
Keyword(s):  
Power Generation ◽  
Gas Turbines ◽  
Air Cooling ◽  
Closed Cycle ◽  
Short Term ◽  
Internally Cooled ◽  
Open Cycle ◽  
Aero Engines ◽  
High Temperature Gas

The purpose of this paper is to examine some possibilities for achieving high gas temperatures in the turbines of both open-cycle and closed-cycle plant and to show how some of the experience gained from research, development, and design of internally cooled blading for aero-engines can be applied to industrial power generation. For the short-term future, preferred schemes would seem to embrace the use of internal air cooling for open-cycle plant and refractory metals without cooling for closed-cycle nuclear plant.

Turbine Stator Well CFD Studies: Effects of Cavity Cooling Air Flow

2008 ◽  
Author(s):  
Antonio Andreini ◽  
Riccardo Da Soghe ◽  
Bruno Facchini ◽  
Stefano Zecchi
Keyword(s):  
Heat Transfer ◽  
Gas Turbines ◽  
Numerical Models ◽  
Engine Performance ◽  
Research Programme ◽  
Experimental Tests ◽  
Air Cooling ◽  
Manufacturing Companies ◽  
Secondary Air ◽  
Cooling Air

The improvement of the aerodynamic efficiency of gas turbine components is becoming more and more difficult to achieve. Nevertheless there are still some devices that could be improved to enhance engine performance. Further investigations on the internal air cooling systems, for instance, may lead to a reduction of cavities cooling air with a direct beneficial effect on engine performance. At the same time, further investigations on heat transfer mechanisms within turbine cavities may help to optimize cooling air flows saving engine life duration. This paper presents some CFD preliminary studies conducted on an two-stage axial turbine rig developed in a research programme on internal air systems funded by EU, named the Main Annulus Gas Path Interactions (MAGPI). Each turbine stage consists of 39 vanes and 78 rotating blades and the modelled domain includes both the main gas path of the two turbine stages and the second stator well. Pre experimental tests CFD computations were planned in order to point out the reliability of numerical models in the description of the flow patterns in the main annulus and in the cavities. Several computational meshes were considered with steady and unsteady approaches in order to assess the sensitivity to computational approach regarding the evaluation of the interactions between main annulus and disk cavities flows. Results were obtained for several cavities cooling air mass-flow rates and data were further analyzed to investigate the influence of the sealing flow inside the main annulus. MAGPI project is a 4 years Specific-Targeted-Research-Project (2007–2011) and its consortium includes six universities and nine gas turbines manufacturing companies. The project is focused on the analysis of interactions between primary and secondary air systems achieving a novel approach as these systems have, up to now, only been considered separately. In particular one of the tasks of the project will focus on heat transfer phenomena and delivering experimental data which will be used to validate the advanced design tools used by industries (CFD codes and correlative formulations).

Heat Transfer in Turbine Hub Cavities Adjacent to the Main Gas Path

2010 ◽  
Author(s):  
Jeffrey A. Dixon ◽  
Antonio Guijarro ◽  
Andreas Bauknecht ◽  
Daniel Coren ◽  
Nick Atkins
Keyword(s):  
Heat Transfer ◽  
Gas Turbines ◽  
Research Programme ◽  
Fe Modelling ◽  
Turbine Stator ◽  
Turbine Efficiency ◽  
Fuel Burn ◽  
Air Supply ◽  
Modelling Techniques ◽  
Cooling Air

Reliable means of predicting heat transfer in cavities adjacent to the main gas path are increasingly being sought by engineers involved in the design of gas turbines. In this paper an interim summary of the results of a four-year research programme sponsored by the EU and several leading gas turbine manufactures and universities will be presented. Extensive use is made of CFD and FE modelling techniques to understand the thermo-mechanical behaviour of a turbine stator well cavity, including the interaction of cooling air supply with the main annulus gas (see Figure 1). The objective of the study has been to provide a means of optimising the design of such cavities for maintaining a safe environment for critical parts, such as disc rims and blade fixings, whilst maximising the turbine efficiency, and minimising the fuel burn and emissions penalties associated with the secondary airflow system. The modelling methods employed have been validated against data gathered from a dedicated two-stage turbine rig, running at engine representative conditions. Extensive measurements are available for a range of flow conditions and alternative cooling arrangements. The analysis method has been used to inform a design change which is also to be tested. Comparisons are provided between the predictions and measurements of the turbine stator well component temperature.

An Investigation Into Numerical Analysis Alternatives for Predicting Re-Ingestion in Turbine Disc Rim Cavities

2012 ◽  
Author(s):  
Antonio Guijarro Valencia ◽  
Jeffrey A. Dixon ◽  
Riccardo Da Soghe ◽  
Bruno Facchini ◽  
Peter E. J. Smith ◽  
...  
Keyword(s):  
Gas Turbines ◽  
Turbulence Models ◽  
Research Programme ◽  
Paper Analysis ◽  
Main Stream ◽  
Cfd Modelling ◽  
Cooling Flow ◽  
Air Supply ◽  
Modelling Techniques ◽  
Cooling Air

Reliable means of predicting ingestion in cavities adjacent to the main gas path are increasingly being sought by engineers involved in the design of gas turbines. In this paper, analysis is to be presented that results from an extended research programme, MAGPI, sponsored by the EU and several leading gas turbine manufactures and universities. Extensive use is made of CFD modelling techniques to understand the aerodynamic behaviour of a turbine stator well cavity, focusing on the interaction of cooling air supply with the main annulus gas. The objective of the study has been to benchmark a number of CFD codes and numerical techniques covering RANS and URANS calculations with different turbulence models in order to assess the suitability of the standard settings used in the industry for calculating the mechanics of the flow travelling between cavities in a turbine through the main gas path. The modelling methods employed have been compared making use of experimental data gathered from a dedicated two-stage turbine rig, running at engine representative conditions. Extensive measurements are available for a range of flow conditions and alternative cooling arrangements. The limitations of the numerical methods in calculating the interaction of the cooling flow egress and the main stream gas, and subsequent ingestion into downstream cavities in the engine (i.e. re-ingestion), have been exposed. This has been done without losing sight of the validation of the CFD for its use for predicting heat transfer, which was the main objective of the partners of the MAGPI Work-Package 1 consortium.

Aerodynamic Performance of Porous Gas Turbine Blades

1969 ◽  
Vol 73 (705) ◽  
pp. 789-796 ◽  
Author(s):  
F. J. Bayley ◽  
G. R. Wood
Keyword(s):  
Heat Transfer ◽  
Turbine Blades ◽  
High Heat ◽  
Air Cooling ◽  
Transfer Coefficients ◽  
Gas Turbine Blades ◽  
Heat Transfer Coefficients ◽  
High Heat Transfer ◽  
Aero Engines ◽  
Cooling Air

If maximum gas temperatures aire to rise appreciably above 1500°K, the value currently achieved in advanced aero-engines, alternatives to the present internal convective methods of air-cooling the first-stage turbine blades will have to be sought. One of the most promising developments lies in the use of porous blade materials, through which cooling air can be “effused” or “transpired”. In a recent paper Bayley and Turner have shown that by the combination of high heat transfer coefficients within the interstices of the porous material, and a reduction in heat transfer rate by injection into the boundary layer on the hot-gas side of the blade, effective cooling rates can be achieved.

A reconnaissance of tropical resources during Revolutionary years: the role of the Paris Museum d'Histoire Naturelle

1991 ◽  
Vol 18 (3) ◽  
pp. 333-362 ◽  
Author(s):  
MADELEINE LY-TIO-FANE
Keyword(s):  
South Africa ◽  
Natural History ◽  
Scientific Research ◽  
Extensive Literature ◽  
War Of Independence ◽  
Leading Role ◽  
Scientific Principles ◽  
Set Up ◽  
Joseph Ii

SUMMARY The recent extensive literature on exploration and the resulting scientific advances has failed to highlight the contribution of Austrian enterprise to the study of natural history. The leading role of Joseph II among the neutral powers which assumed the carrying trade of the belligerents during the American War of Independence, furthered the development of collections for the Schönbrunn Park and Gardens which had been set up on scientific principles by his parents. On the conclusion of peace, Joseph entrusted to Professor Maerter a world-encompassing mission in the course of which the Chief Gardener Franz Boos and his assistant Georg Scholl travelled to South Africa to collect plants and animals. Boos pursued the mission to Isle de France and Bourbon (Mauritius and Reunion), conveyed by the then unknown Nicolas Baudin. He worked at the Jardin du Roi, Pamplemousses, with Nicolas Cere, or at Palma with Joseph Francois Charpentier de Cossigny. The linkage of Austrian and French horticultural expertise created a situation fraught with opportunities which were to lead Baudin to the forefront of exploration and scientific research as the century closed in the upheaval of the Revolutionary Wars.

Success Drivers of Urban Haats Selling Craft Products

2020 ◽  
pp. 097300522096468
Author(s):  
Rajesh Gupta ◽  
Piyush Kumar Sinha ◽  
Akash Sahu ◽  
Vandana Sood
Keyword(s):  
Mixed Method ◽  
Rural Economy ◽  
Mediating Role ◽  
Role Based ◽  
Craft Industry ◽  
Set Up ◽  
Market Separations ◽  
Method Approach

Craft industry is as much the mainstay of the rural economy after agriculture. It provides occupation to a large section of population. However, it is characterised by fragmented individual artisans on one side and dispersed customers on the other. It also suffers from market separations. Urban haats were set up with the objective to present artisans and buyer on one platform and reduce these separations. In this study urban haats have been conceptualised as marketplaces that bring artisans and customers at one place to optimise their respective values. They also serve as a tool for disintermediation and a social distribution initiative and represent a retailing initiative in the inclusive entrepreneurship domain. This study focusses on identifying drivers of success of urban haats. Using a mixed method approach, data was collected from Haat officials and NGO members through personal interviews. The data from artisans and customers was collected through a survey using a structured response format. The study was conducted at 18 haats in 10 states. The study highlights the factors that drive satisfaction of artisans and customers and the role of administrators in making the marketplace a success. Customer consider diversity of the products, quality of the products, behaviour of the salesperson, price parity with other markets, buying experience, parking space and aesthetics of the stalls as major influencing factors for the recommendation of the haats to other customers. Most important attributes of the haats in driving artisan satisfaction were stall allotment system, haat location, advertisements, product promotion and monitoring. It is also found that while the infrastructure is necessary, it is not sufficient in enhancing the performance and sustainability of haats. Administration of these haats plays a defining mediating role. Based on these findings, an approach is proposed for success of urban haats.

Sign in / Sign up

Export Citation Format

Share Document