Evaluation of Engine Inlet Vortices Using CFD

Trapp, Luis Gustavo; Girardi, R.

doi:10.2514/6.2012-1200

Cited by 12 publications

(2 citation statements)

References 6 publications

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“…However, no further analysis regarding the unsteady characteristics or the nature of intake flows under crosswind was provided, focusing only on the development of the methodology for vortex monitoring to be applied during the calculations. Many other CFD studies have been carried out to investigate the effect of crosswind on the performance of an aspirated inlet with ground plane ( [16], [17]) or without ( [18], [19]), or on the performance of the fan system in terms of stability and stall margin ([20]- [23]). However, the inherent unsteady characteristics of the ground vortex, when present, have not received much attention in previous works, hence its impact on the distortions at the Aerodynamic Interference Plane (AIP) is not fully understood.…”

Section: Introductionmentioning

confidence: 99%

Investigations of the Unsteady Aerodynamic Characteristics for Intakes at Crosswind

Piovesan

Zhang

Vahdati

et al. 2022

Volume 10C: Turbomachinery — Design Methods and CFD Modeling for Turbomachinery; Ducts, Noise, and Component Interactions

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The ground vortex generated in front of an intake operating near the ground and subjected to crosswind is investigated using CFD and compared to the experiments. The flow field of a scale-model intake is numerically simulated with both steady and unsteady approach, with the aim of predicting ground vortex effects and to characterize the vortex unsteady behaviour. The experimental results showed that for an intake near the ground under crosswind the ground vortex that forms under the intake and the in-duct separation, when present, exhibit unsteady behaviour that becomes stronger as the crosswind velocity is increased. The simulations indicate that a steady-state approach only partially reproduces the time-averaged ground vortex characteristics and in-duct distortion losses, while an unsteady approach shows a lower level of unsteadiness compared to the experimental observations. The consequences of the unsteady flow in the intake on the fan aerodynamic and aeroelastic stability are finally discussed to reinforce that these can result in significant non-synchronous vibration (NSV) and loss of stall margin which cannot be adequately assessed if no unsteady component of the inlet distortions is taken into account.

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Section: Introductionmentioning

confidence: 99%

Investigations of the Unsteady Aerodynamic Characteristics for Intakes at Crosswind

Piovesan

Zhang

Vahdati

et al. 2022

Volume 10C: Turbomachinery — Design Methods and CFD Modeling for Turbomachinery; Ducts, Noise, and Component Interactions

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“…In the 1970s, panel methods and computer codes were developed to gain further insight into the phenomenon, but only in the past decade CFD has been applied to its study. 7,9 Figure 1 shows the intake vortex in three distinct scenarios: part (a) shows the vortex in an engine on a test stand close to the ground, part (b) shows it on a military engine far above the ground, and part (c) shows it on a propeller aircraft. These figures demonstrate that the vortex can occur in different types of aero-engines as well as in a wide range of operating conditions.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamics of intakes of high bypass ratio (hbpr) turbofan engines

El-Sayed¹,

Emeara²

2020

IRATJ

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Analysis of propeller-induced ground vortices by particle image velocimetry

Yang

Sciacchitano

Veldhuis

et al. 2017

J Vis

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The interaction between a propeller and its self-induced vortices originating on the ground is investigated in a scaled experiment. The velocity distribution in the flow field in two different planes containing the self-induced vortices is measured by particle image velocimetry (PIV). These planes are a wall–parallel plane in close proximity to the ground and a wall–normal plane just upstream of the propeller. Based on the visualization of the flow field in these two planes, the occurrence of ground vortices and its domain boundary are analysed. The elevation of the propeller from the ground and the thrust of the propeller are two parameters that determine the occurrence of ground vortices. The main features of the propeller inflow in the presence of the ground vortices are highlighted. Moreover, the analysis of the non-uniform inflow in the azimuthal direction shows that with increasing the propeller thrust coefficient and decreasing the elevation of the propeller above the ground, the variation of the inflow angle of the blade increases.Graphical Abstract

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Evaluation of Engine Inlet Vortices Using CFD

Cited by 12 publications

References 6 publications

Investigations of the Unsteady Aerodynamic Characteristics for Intakes at Crosswind

Investigations of the Unsteady Aerodynamic Characteristics for Intakes at Crosswind

Aerodynamics of intakes of high bypass ratio (hbpr) turbofan engines

Analysis of propeller-induced ground vortices by particle image velocimetry

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