A Review of Computational Aeroelasticity Of Civil Fan Blades

Vahdati, Mehdi; Lee, Kuen-Bae; Sureshkumar, Prathiban

doi:10.38036/jgpp.11.4_22

Cited by 15 publications

(6 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Closer to the fanface (𝑥 * = 0.9), the amplitude of static pressure ŕuctuations associated with blade-passing was dominant although a low-frequency signature due to the aero-mechanical response of the compression system, particularly relative to high-cycle fatigue and resonance analysis [55]. This is particularly true for high-loaded fan blades such as those of a low-speed fan [56,57]. Thus, for a closely coupled fan-intake in crosswind conditions, the inŕuence of intake design on the temporo-spatial characteristics of the intake ŕow distortions has to be determined.…”

Section: Space-time Characteristics Of Flow Distortionsmentioning

confidence: 97%

Effect of Unsteady Fan-Intake Interaction on Short Intake Design

Boscagli,

MacManus,

Christie

et al. 2023

Journal of Engineering for Gas Turbines and Power

View full text Add to dashboard Cite

The next generation of ultrahigh bypass ratio civil aero-engines promises notable engine cycle benefits. However, these benefits can be significantly eroded by a possible increase in nacelle weight and drag due to the typical larger fan diameters. More compact nacelles, with shorter intakes, may be required to enable a net reduction in aero-engine fuel burn. The aim of this paper is to assess the influence of the design style of short intakes on the unsteady interaction under crosswind conditions between fan and intake, with a focus on the separation onset and characteristics of the boundary layer within the intake. Three intake designs were assessed, and a hierarchical computational fluid dynamics (CFD) approach was used to determine and quantify primary aerodynamic interactions between the fan and the intake design. Similar to previous findings for a specific intake configuration, both intake flow unsteadiness and the unsteady upstream perturbations from the fan have a detrimental effect on the separation onset for the range of intake designs. The separation of the boundary layer within the intake was shock driven for the three different design styles. The simulations also quantified the unsteady intake flows with an emphasis on the spectral characteristics and engine-order signatures of the flow distortion. Overall, this work showed that is beneficial for the intake boundary layer to delay the diffusion closer to the fan and reduce the preshock Mach number to mitigate the adverse unsteady interaction between the fan and the shock.

show abstract

Section: Space-time Characteristics Of Flow Distortionsmentioning

confidence: 97%

Effect of Unsteady Fan-Intake Interaction on Short Intake Design

Boscagli,

MacManus,

Christie

et al. 2023

Journal of Engineering for Gas Turbines and Power

View full text Add to dashboard Cite

show abstract

“…This effect can be either stabilising or destabilising, depending on the phase difference between vibration and reflected wave. Several studies describe these effects and present analytic [7] and numerical methods [8], [9] to address the coupled aerodynamic damping. Since CA3ViAR is aiming at generating flutter conditions, the coupling of intake and rotor must be resolved and quantified during the design process.…”

Section: Flutter Analysis and Stability Mapmentioning

confidence: 99%

The preliminary design of a scaled Composite UHBR Fan for a wind tunnel test campaign

Paletta

Flüh

Lindemann

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

The ambition of the CA3ViAR project is to design an open test case fan that experiences instability mechanisms, which are representative for ultra-high bypass ratio (UHBR) fans of civil aircrafts, and to perform a comprehensive experimental investigation to measure aerodynamic, aeroelastic and aeroacoustic performance in a wide range of operational conditions. Experimental tests will be performed in the Propulsion-Test-Facility (PTF) of the Institute of Jet Propulsion and Turbomachinery (IFAS) of Technische Universität Braunschweig, Germany. The final objective of the project is to provide an open test case for the entire research community, with geometries, numerical and experimental results to establish a new reference for composite UHBR fan design. This will support the development of new methods and tools for the development of safer, lighter and more efficient composite fans for greener UHBR engines. In this work the preliminary design of the low transonic fan (LTF) to be used as test article, whose main requirement is to be operated in a safe and controlled way in conditions of aerodynamic and/or aeroelastic instability during wind tunnel operations, is presented. More in particular, consolidated aerodynamic design, strategy adopted to drive the structural design, flutter analysis taking into account acoustic reflection at the intake, dynamic and stress analyses, as well as aeroacoustic measurement optimization are presented and discussed. The preliminary mechanical design of composite blades and the rotor hub, together with the rotor instrumentation and related studies to embed sensors in the composite blades, are also part of this article, and complemented by manufacturing trials and demonstration tests give the full picture of all the project activities up to the preliminary design review.

show abstract

“…The fan is made of titanium and manufactured as a blisk. Thus, the mechanical damping is negligible, and aerodynamic damping is crucial in determining the aeroelastic stability [9].…”

Section: Aecc Cae Wide Chord Fan Rigmentioning

confidence: 99%

“…Some factors have been identified to have an important influence on blade flutter, e.g., mode coupling [1,2], inter blade phase angle (IBPA) [3], tip clearance flow [4], mistuning [5], interaction between stages [6,7], and acoustic reflections [8]. In particular, Vahdati et al [9] concluded that wide chord fan blade flutter usually occurs in the 1F mode when the inlet relative Mach number at the fan tip is close to the unit. They classified civil wide chord fan blade flutter into two types: classical stall flutter and acoustic flutter.…”

Section: Introductionmentioning

confidence: 99%

Uncovering the Root Causes of Stall Flutter in a Wide Chord Fan Blisk

Huang

Yang

Wang

2022

IJTPP

View full text Add to dashboard Cite

Flutter was encountered at part speeds in a scaled wide chord fan blisk designed for a civil aeroengine during a rig test when the fan bypass flow was throttled toward its stall boundary. Analysis of the blade tip timing measurement data revealed that the fan blades vibrated at the first flap (1F) mode with nodal diameters of two and three. To facilitate a further rig test and ultimately eliminate the flutter problem, a numerical campaign was launched to help understand the root causes of the flutter. Both the influence coefficient method (ICM) and the traveling wave method (TWM) were employed in the numerical investigation to analyze unsteady flows due to blade vibration, with the intention to corroborate different numerical results and take advantage of each method. To eliminate nonphysical reflections, a sponge layer with an inflated mesh size was used for the extended inlet and outlet regions. Steady flow field and unsteady flow field were examined to relate them to the blade flutter. The influences of vibration frequency, mass flow rate, shock, boundary layer separation and acoustic mode propagation behaviors on the fan flutter stability were also investigated. Particular attention was paid to the acoustic mode propagation behaviors.

show abstract

A Review of Computational Aeroelasticity Of Civil Fan Blades

Cited by 15 publications

References 40 publications

Effect of Unsteady Fan-Intake Interaction on Short Intake Design

Effect of Unsteady Fan-Intake Interaction on Short Intake Design

The preliminary design of a scaled Composite UHBR Fan for a wind tunnel test campaign

Uncovering the Root Causes of Stall Flutter in a Wide Chord Fan Blisk

Contact Info

Product

Resources

About