Research on the ground vortex and inlet flow field under the ground crosswind condition

Chen, Jingjing; Wu, Yadong; Ouyang, Huajiang; Wang, Anjenq

doi:10.1016/j.ast.2021.106772

Cited by 11 publications

(4 citation statements)

References 22 publications

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“…Based on the quantitative analysis of the intensity, frequency, and dynamic characteristics of the ground vortex, the interaction between the crosswind and the ground vortex is studied by considering the direct effect of the crosswind on the inlet distortion and the indirect effect of the crosswind on the ground vortex. The results showed that the process of inlet distortion increasing with crosswind is unsteady and unstable due to the existence of surface vortices [10]. Xu et al used the LES method to study the wake vortex of the ground effect on aircraft.…”

Section: Of 25mentioning

confidence: 99%

Study on the Influence of a Powered Nacelle on the Wake Vortex Characteristics of Wide-Body Aircraft

Wang,

Wu,

Guo

et al. 2024

Aerospace

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The aircraft wake vortex is an important factor affecting flight safety; as an important part of the aircraft, the powered nacelle will inevitably have an important impact on the aircraft wake vortex, so it is of great practical significance to research it. The present study focused on the numerical simulation of the wake flow of large aircraft (as the front aircraft) and the comparative analysis of the influence of engine jets on the wake flow. In order to meet the accuracy requirements and control the consumption of computing resources, LES and RANS methods were compared, and the RANS method was finally selected for subsequent calculation. The dynamic effect of jet flow was simulated by simplifying the boundary conditions of the inlet fan and outlet bypass as the mass flow boundary condition. The simulation results showed that the engine nacelle will have a significant impact on the morphology of the aircraft wake flow (position and strength of the main vortex in the wake flow system), which is caused by the vortices formed under the shear flow and separated flow of the nacelle. However, the nacelle will not significantly change the total strength of the wake vortex (half-plane circulation). The engine jet intensity causes additional turbulent mixing, which will accelerate the fusion of the nacelle vortex and ultimately change the intensity ratio of the inner wing vortex and the wingtip vortex, affecting the trajectory of the wake of the mean vortex. The study provides a corresponding reference for the following research on a wake vortex by a powered nacelle.

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Section: Of 25mentioning

confidence: 99%

Study on the Influence of a Powered Nacelle on the Wake Vortex Characteristics of Wide-Body Aircraft

Wang,

Wu,

Guo

et al. 2024

Aerospace

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“…The ingestion of vortices in aero-engines has been investigated for the characterization of ground vortices. 21 This topic is still of importance for aircraft manufacturers, especially in relation to the ingestion of foreign object debris and for cross-wind conditions. 22 , 21 Depending on the configuration, the closer integration of the engine with the fuselage may promote the formation of vortices which arise from the aerodynamic surfaces.…”

Section: Introductionmentioning

confidence: 99%

“… 21 This topic is still of importance for aircraft manufacturers, especially in relation to the ingestion of foreign object debris and for cross-wind conditions. 22 , 21 Depending on the configuration, the closer integration of the engine with the fuselage may promote the formation of vortices which arise from the aerodynamic surfaces. In addition, the engine may be exposed to vortices which originate from the inner wing leading edge, canards, strakes and forebody.…”

Section: Introductionmentioning

confidence: 99%

S-duct flow distortion with non-uniform inlet conditions

Migliorini

Zachos

MacManus

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part G:

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Convoluted aero-engine intakes are often required to enable closer integration between engine and airframe. Although the majority of previous research focused on the distortion of S-duct intakes with undistorted inlet conditions, there is a need to investigate the impact of more challenging inlet conditions at which the intake duct is expected to operate. The impact of inlet vortices and total pressure profiles on the inherent unsteady flow distortion of an S-duct intake was assessed with stereo particle image velocimetry. Inlet vortices disrupted the characteristic flow switching mode but had a modest impact on the peak levels and unsteady fluctuations. Non-uniform inlet total pressure profiles increased the peak swirl intensity and its unsteadiness. The frequency of swirl angle fluctuations was sensitive to the azimuthal orientation of the non-uniform total pressure distribution. The modelling of peak distortion with the extreme value theory revealed that although for some inlet configurations the measured peak swirl intensity was similar, the growth rate of the peak values beyond the experimental observations was substantially different and it was related with the measured flow unsteadiness. This highlights the need of unsteady swirl distortion measurements and the use of statistical models to assess the time-invariant peak distortion levels. Overall, the work shows it is vital to include the effect of the inlet flow conditions as it substantially alters the characteristics of the complex intake flow distortion.

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“…More recently, Chen et al [14] carried out an experimental and numerical study on the ground vortex field under crosswind analysing the vortex unsteadiness and instabilities in terms of intensity and frequency and identifying some variations of the ground vortex characteristics with velocity ratio. The simulations were carried out across a range of velocity ratios 𝑈 * for two fixed intake velocities at a fixed non-dimensional height, analysing the frequency of the ground vortex and validating against the experimental data available.…”

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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Research on the ground vortex and inlet flow field under the ground crosswind condition

Cited by 11 publications

References 22 publications

Study on the Influence of a Powered Nacelle on the Wake Vortex Characteristics of Wide-Body Aircraft

Study on the Influence of a Powered Nacelle on the Wake Vortex Characteristics of Wide-Body Aircraft

S-duct flow distortion with non-uniform inlet conditions

Investigations of the Unsteady Aerodynamic Characteristics for Intakes at Crosswind

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