Three-Dimensional Navier-Stokes Analysis of Tip Clearance Flow in Linear Turbine Cascades

Liu, Jong-Shang; Bozzola, R.

doi:10.2514/3.49123

Cited by 18 publications

(7 citation statements)

References 8 publications

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“…The other important class of space centred scheme, used in particular for turbomachinery applications, is based on the scheme proposed originally by Jameson et al (1981), built on a simple centred discretisation of the physical flux completed by a non-linear second order dissipation accompanied by a linear fourth order dissipation. Different versions of this scheme, which is in fact the most popular scheme used in the CFD community, have been implemented in 3D codes using a node centred approach (Chima, 1991, Dawes, 1992 or a cell centred approach (Amone, 1993, Calvert, 1997, Dawes, 1986, Jennions, 1993, Kang, 1993, Liu 1993, McNulty, 1994, Vuillot, 1993, Shabbir, 1996, and Zimmermann, 1992, with various implementations of the original numerical dissipation adapted to the type of mesh.…”

Section: Space Centred Schemesmentioning

confidence: 99%

The North Atlantic Treaty Organization

Giegerich¹

2018

Oxford Scholarship Online

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NATO, founded as a collective defence alliance, has spent most of the post-cold-war period transforming itself into a security management organization. Its ability to adapt has been the basis of NATO’s continued relevance. At the same time, NATO’s adjustments in functional and geographic scope have triggered debate about its strategic direction and the political and military requirements necessary to fulfil current and future roles. This chapter will assess NATO’s evolution by concentrating on the bargaining processes among member states that shaped the direction of NATO’s strategic guidelines and its out-of-area operational activities. The objective is to trace the extent to which a common strategic outlook has emerged among the European members of NATO.

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Section: Space Centred Schemesmentioning

confidence: 99%

The North Atlantic Treaty Organization

Giegerich¹

2018

Oxford Scholarship Online

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Section: Space Centred Schemesmentioning

confidence: 99%

North Atlantic Treaty Organization

Whitfield¹

2012

The Wiley‐Blackwell Encyclopedia of Globalization

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The high performance of aircraft turbine engines-mainly oriented towards economy in civil engines and towards performance, economy and off-design reliability in military applications-depends on the correct design of gas flows in the engine. Today, this is mainly done by numerical computer simulation instead of the much more costly experimentation with hardware. The working group undertook to analyse the quality of computer codes in use and to show ways for improvement. Many discrepancies between codes were detected and it was recognized that even the researchers actively working in this field were unaware of the full scale of this phenomenon. The military will gain from the newly designed engines as well as from possible improvement in upgrades. It should be noted that this kind of down-toearth analysis, despite its merits, has not been undertaken on an international basis outside AGARD/RTO. La validation CFD des organes des propulseurs (AGARD AR-355) Synthese La recherche de hautes performances des turbomoteurs, motivee, pour les moteurs civils, principalement par la recherche d'economies, et pour les moteurs militaires par F amelioration des performances, les economies et la fiabilite dans des conditions hors tolerances, passe par une connaissance precise de la conception des ecoulements dans le moteur. Aujourd'hui, dans ce domaine il est fait appel en general, ä la simulation numerique par ordinateur, de preference ä 1'experimentation reelle, beaucoup plus coüteuse. Le groupe de travail No. 26 s'est donne pour täche d'analyser la qualite des codes machine utilises et de faire des recommendations concernant d'eventuelles ameliorations. Un nombre eleve de divergences entre les differents codes a ete constate et il a ete admis que meme les chercheurs impliques activement dans ce domaine ignoraient la veritable ampleur du phenomene. Les militaires pourront tirer profit des moteurs de nouvelle generation, ainsi que des ameliorations possibles apportees par les remises ä niveau. II est ä noter que malgre son merite evident, ce type d'analyse pragmatique n'a pas ete entrepris au niveau international en dehors de FAGARD/RTO.

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“…A numerical simulation of compressible flow near a turbine tip gap region in a linear cascade arrangement was presented by (Liu and Bozzola 1993). A significant reduction of gap exit leakage mass flow from a moving outer casing was presented in comparison to a stationary outer wall.…”

Section: Flow Visualizations Via Computationsmentioning

confidence: 99%

Aerodynamic character of partial squealer tip arrangements in an axial flow turbine. Part I: Detailed aerodynamic field modifications via three dimensional viscous flow simulations around baseline tip

Kavurmacıoğlu

Dey²,

Camcı

2007

PCFD

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This paper deals with the viscous flow simulations of the complex tip leakage flow in Axial Flow Turbine Research Facility (AFTRF). Special attention is paid to the 3D structure of the tip leakage flow mechanisms in a baseline tip configuration with no desensitization. Although past experimental studies provide much insight into the physical understanding of the tip region aerodynamics, there are still many areas of the flow-field in which experiments are extremely difficult to perform. Fine details of the entrance flow near the pressure side where the tip leakage jet starts to form, the leakage jet formation between the tip surface and outer casing, the re-circulatory flow zone very near the pressure side corner, the interaction area of the tip vortex with the conventional passage flow, the influence of the relative motion of the outer casing and leakage flow reversal can be visualized with excellent resolution. After the presentation of the measured inlet boundary conditions and a grid independency study, the baseline tip flow simulations are discussed in detail.

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Three-Dimensional Navier-Stokes Analysis of Tip Clearance Flow in Linear Turbine Cascades

Cited by 18 publications

References 8 publications

The North Atlantic Treaty Organization

The North Atlantic Treaty Organization

North Atlantic Treaty Organization

Aerodynamic character of partial squealer tip arrangements in an axial flow turbine. Part I: Detailed aerodynamic field modifications via three dimensional viscous flow simulations around baseline tip

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