Study of geometric parameters for the design of short intakes with fan modelling

Magrini, Andrea; Benini, Ernesto

doi:10.1016/j.cja.2022.01.018

Cited by 11 publications

(2 citation statements)

References 34 publications

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“…Changes in the intake ŕow topology relative to a change in either 𝑉 𝑤𝑖𝑛𝑑 or 𝑚 were established but it was not possible to quantify the sensitivity of the ŕow separation onset to changes in operating conditions. Recent steady [15,16] and unsteady [17] CFD studies of short and conventional intakes with fan-coupling under high-incidence conditions showed the impact of intake design style and compactness on the onset of large total pressure and swirl distortions at the fan face due to notable separation of the intake boundary layer. Silva et al [18] assessed with steady CFD analyses different short intake designs under both high-incidence and crosswind conditions, and evaluated the impact of a change in short intake design on the status of the intake boundary layer.…”

Section: Introductionmentioning

confidence: 99%

Effect of Unsteady Fan-Intake Interaction on Short Intake Design

Boscagli,

MacManus,

Christie

et al. 2023

Journal of Engineering for Gas Turbines and Power

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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.

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Section: Introductionmentioning

confidence: 99%

Effect of Unsteady Fan-Intake Interaction on Short Intake Design

Boscagli,

MacManus,

Christie

et al. 2023

Journal of Engineering for Gas Turbines and Power

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“…He proposed a variant of Hall's model that was used to assess fan operation under inlet distortion [17,18] and a new formulation based on a lift/drag analogy. This model, called L/D, was employed in different studies pertaining to fan/airframe interaction, such as crosswind [19], nacelle intakes [20][21][22], and installation effects [23].…”

Section: Introductionmentioning

confidence: 99%

Body Force Model Implementation of Transonic Rotor for Fan/Airframe Simulations

Magrini

2022

Aerospace

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Three-dimensional throughflow models represent a turbomachinery cascade via a force distribution without the need for detailed geometric modelling in the numerical solution, saving consistent computational resources. In this paper, we present the application of a body force method on an axial transonic fan implemented into an in-house tool for axisymmetric throughflow simulations. By a systematic comparison of local and integral quantities with a validated numerical solution, the capabilities and limitations of the model are discussed for different operating regimes. The implementation is first validated at the peak efficiency calibration point, providing a good duplication of blade flow variables and radial profiles. The design total pressure is matched with a 0.6% absolute difference and a slightly higher slope of the characteristic towards the stall. The isentropic efficiency curve is penalised after the choking mass flow rate calibration, presenting an absolute difference close to 2%, although with a consistent off-design trend. In general, the model provides a satisfactory representation of the flow field and the outflow spanwise distributions, with locally larger discrepancies near the endwalls. Finally, the method is applied to simulate the fan and outlet guide vanes installed into an isolated turbofan nacelle. The onset of intake stall at a high angle of attack is compared between the body force and a boundary conditions-based approaches, highlighting the importance of adopting fully coupled solution methods to study fan/airframe interaction problems.

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Aeropropulsive assessment of engine installation at cruise for UHBPR turbofan with body force fan modelling

Magrini

Benini

2023

Aerospace Science and Technology

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Study of geometric parameters for the design of short intakes with fan modelling

Cited by 11 publications

References 34 publications

Effect of Unsteady Fan-Intake Interaction on Short Intake Design

Effect of Unsteady Fan-Intake Interaction on Short Intake Design

Body Force Model Implementation of Transonic Rotor for Fan/Airframe Simulations

Aeropropulsive assessment of engine installation at cruise for UHBPR turbofan with body force fan modelling

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