... aerodynamics computational fluid dynamics (CFD) aerodynamic design The concept of a boundary layer ingesting (BLI) propulsion system is widely recognized as one of the key enablers (together with the hybrid/electric systems and distributed propulsion), which allow a significant reduction in mission...

...A. Hildebrandt; T. Ceyrowsky; J. Klausmann; K. A. Metz In the present paper, three centrifugal stages of high volume flow coefficient are compared to each-other regarding their aerodynamic performance in design point and off-design point conditions at different speed and inlet guide vane (IGV...

... flows upstream of the passage is expected to interact and change passage aerodynamics and, subsequently, mixing and transport of coolants. This study describes, experimentally, the aero-thermal interaction of cooling flows near the endwall of a first-stage nozzle guide vane passage. The test section...

...C. De Maesschalck; V. Andreoli; G. Paniagua; T. Gillen; B. Barker The optimization of the turbine rotor tip geometry remains a vital opportunity to create more efficient and durable engines. Balancing the aerodynamic and thermal aspects, while maintaining the mechanical integrity, is key to reshape...

... in the J ournal of T urbomachinery . 09 12 2020 23 02 2021 23 02 2021 19 05 2021 aerodynamics experimental CFD transition secondary flow structures IR thermography turbine rear structure low pressure turbine engine exit structure turbine exhaust casing tail bearing...

..., the distortion at the fan face during cruise is close to radial. This article aims to devise and test a fan design philosophy that is tuned to this inflow distortion. Initially, a free-vortex fan design matched to clean inflow is presented. The effects of BLI on the aerodynamics of this fan are investigated...

... aerodynamics The possibility for unsteady blade row interaction to affect rotor film cooling performance has been recognized for some time, since the first measurements of film effectiveness on rotating blades showed discrepancies compared to predictions based on cascade and flat-plate measurements [ 1...

... of the turbine stage. Numerical simulations were conducted using the Rolls-Royce in-house code HYDRA, with and without inlet swirl. References 1 Qureshi , I. , Smith , A. D. , and Povey , T. , 2011 , “ HP Vane Aerodynamics and Heat Transfer in the Presence of Aggressive Swirl...

...M. Lorenz; A. Schulz; H.-J. Bauer The present experimental study is part of a comprehensive analysis accounting for heat transfer and aerodynamic losses on a highly loaded low pressure turbine blade with varying surface roughness. Whereas Part I focuses on heat transfer measurements at airfoil...

... further measurements at the airfoil midspan with different deterministic surface roughness are considered. Part I investigates the external heat transfer enhancement due to rough surfaces, whereas part II focuses on surface roughness effects on aerodynamic losses. A set of different arrays...

... unsteady. The unsteady flow interactions between the turbine and the exhaust system have a strong impact on the blade loading or blade aerodynamic force. This paper describes the unsteady flow interactions between a single-stage axial turbine and an exhaust system. The experimental and numerical studies...

... transfer coefficients. Comparison of the average aerodynamic and thermal performances of the squealer tips Full rim squealer Partial squealer Cooling flow ratio (%) 0.48 0.48 Average total pressure loss, ( P 01 − P 02 ) / P 01 (%) 4.22 4.37...

... in Part I focused on the aerodynamics of the fully cooled turbine for a subset of the cases investigating two vane inlet temperature profiles (uniform and radial) and three different cooling levels (none, nominal, and high) for the high Reynolds number condition. This part of the paper focuses on the time...

...C. W. Haldeman; M. G. Dunn; R. M. Mathison A fully cooled turbine stage is utilized to investigate the combined effects of turbine stage cooling variation and high-pressure turbine (HPT) vane inlet temperature profile on the aerodynamics and heat transfer of the turbine stage operating...

...Marco Raciti Castelli; Ernesto Benini This paper presents a model for the evaluation of energy performance and aerodynamic forces acting on a small helical Darrieus vertical axis wind turbine depending on blade inclination angle. It consists of an analytical code coupled to a solid modeling...

... with camber lines of arbitrary shape, and involving a three-dimensional computational fluid dynamics solver, this paper establishes a numerical aerodynamic optimization platform for the three-dimensional blades of axial compressors. The optimization in this paper mainly has four features. First, it applies...

... Operating at Engine Representative Flow Conditions (II) Time-Resolved Results ,” Int. J. Heat Fluid Flow 0142-727X , 25 , pp. 945 – 960 . 10.1016/j.ijheatfluidflow.2004.02.028 Greenway , M. E. , and Wood , C. J. , 1979 , “ The Oxford University 4 m×2 m Industrial Aerodynamic Wind...

... , A. , 1990 , “ Unsteady Flow Performance of Turbocharger Radial Turbines ,” Proceedings of IMechE , Paper No. C405/017. 16 02 2009 24 03 2009 30 06 2011 30 06 2011 aerospace engines compressors engines exhaust systems nozzles aerodynamics radial turbines unsteady...

...R. Edwards; A. Asghar; R. Woodason; M. LaViolette; K. Goni Boulama; W. D. E. Allan This paper addresses the issue of aerodynamic consequences of small variations in airfoil profile. A numerical comparison of flow field and cascade pressure losses for two representative repaired profiles...

... measurements are obtained using a novel miniature fast-response probe, which has been developed at ETH Zurich. The entropy probe has two components: a one-sensor fast-response aerodynamic probe and a pair of thin-film gauges. The probe allows the simultaneous measurement of the total temperature and the total...