Generation mechanism and aerodynamic characteristic modeling of ground vortex in crosswind condition

Jia, Wei; Wu, Yifei; Lei, Yue

doi:10.1016/j.ast.2019.105581

Cited by 5 publications

(4 citation statements)

References 9 publications

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“…9). The analysis of pressure changes in the longitudinal section has provided information only about the range of total pressure changes in the intake duct, which has ranged from p*=2.0110 4 Pa to p*=1.0710 5 Pa.…”

Section: Analysis Of the Resultsmentioning

confidence: 99%

“…In the area of work of the intake systems, the following problems can be distinguished: the boundary layer issues for various types of inlet systems [1], [2] the influence of the jet engine inlet operating conditions on the fan [3], [4] or the inlet vortex problem [5]. In the case of the analysis of the problem of the phenomenon of the inlet vortex itself, as in [5], the mechanism of generating a ground vortex has been analyzed at different variants of the gust (side wind and head wind). The mechanisms of vortex formation for different gust variants are also different.…”

mentioning

confidence: 99%

“…The mechanisms of vortex formation for different gust variants are also different. In [5], the authors have created and verified a mathematical model in order to predict the strength of a vortex on the ground based on the aerodynamic similarity. Based on the built model, the effect of ground clearance (inlet-ground) on the vortex strength has been assessed.…”

mentioning

confidence: 99%

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Impact of the Intake Vortex on the Stability of the Turbine Jet Engine Intake System

Kozakiewicz

Frant

Majcher

2021

IREASE

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The article presents a numerical analysis of the intake system of a turbine jet engine in terms of parameter stability along its duct, following the occurrence of an intake vortex. This type of intake system is characterized by high susceptibility to intake vortex. In extreme cases, this type of phenomenon leads to the engine surge and even to the operation disruption (engine stalling). The article presents a developed model of the front part of the aircraft with an intake duct. The discretization process involved in the issue under consideration has been described. The airflow parameters corresponding to the conditions in such cases have been adopted and numerical calculations have been performed. The result is an intake vortex. Subsequently, significant cross sections in the intake system have been separated, on which the impact pressure distributions have been determined. The main part of the article is devoted to the analysis of pressure distributions. They have been subjected to quantitative analysis using the proposed pressure coefficient. The coefficient has provided quantitative information about the difference in pressure distributions for selected sections. The results obtained have provided information about mounting airflow instability in the flow duct caused by the intake vortex.

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Section: Analysis Of the Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

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Impact of the Intake Vortex on the Stability of the Turbine Jet Engine Intake System

Kozakiewicz

Frant

Majcher

2021

IREASE

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“…On the contrary, for low values of ℎ/𝐷 𝑙 or high values of 𝑈 𝑖 /𝑈 ∞ , that is when the intake is operating closer to the ground or at higher values of mass flow, the stream-tube interacts with the ground and a single vortex forms under the intake, while a single trailing vortex is present off the leeward lip (Figure 2). Different correlations relating the vortex formation to the heightto-diameter ratio of the intake and the velocity ratio, which is linked to the size of the capture stream-tube were presented in previous experimental or numerical studies ( [4], [5], [6], [7] [8]). The dependency of the formation of the ground vortex from ℎ/𝐷 𝑙 and 𝑈 𝑖 /𝑈 ∞ and its strength were illustrated graphically or modelled mathematically in terms of vortex formation maps, which estimate the threshold for the insurgence of the vortex and predict its strength based on qualitative visualizations and/or quantitative measurements and simulations.…”

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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Enhancement of wake vortex decay by air blowing from the ground

et al. 2021

Aerospace Science and Technology

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Generation mechanism and aerodynamic characteristic modeling of ground vortex in crosswind condition

Cited by 5 publications

References 9 publications

Impact of the Intake Vortex on the Stability of the Turbine Jet Engine Intake System

Impact of the Intake Vortex on the Stability of the Turbine Jet Engine Intake System

Investigations of the Unsteady Aerodynamic Characteristics for Intakes at Crosswind

Enhancement of wake vortex decay by air blowing from the ground

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