Improving Wind Tunnel “1-cos” Gust Profiles

Balatti, Davide; Khodaparast, Hamed Haddad; Friswell, Michael I.; Μανωλέσος, Μαρίνος

doi:10.2514/1.c036772

Cited by 8 publications

(3 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…And this is also the main reason for the decrease in the cross-correlation coefficient at high jet frequencies. To get a more ideal gust shape, this influence might be reduced by decreasing the vorticity at the gust's beginning and end in an appropriate way [12]. 16 shows the streamlines starting from the trailing edge jet slot at the moments when C μ is maximum and the gust angle at the position (x = 5c, y = 0, z = 5c) reaches the peak.…”

Section: Unsteady Jet Resultsmentioning

confidence: 99%

“…These devices that generate disturbance to the stream flow by means of vanes or cascade oscillation have the advantages of simple structure, convenient control, and clear gust generation mechanism, while small frequency coverage and single gust shape (sinusoidal) become the limits. Additionally, due to the power limitations of the driving methods, the generation of individual discrete gusts under subsonic and transonic flow through these devices seems to be a challenging task [12], even though this is precisely the gust profile required for airworthiness certification.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Simulations of Vertical Discrete Gusts Driven by Trailing Edge Blowing

Shi,

Lu,

Guo

et al. 2023

International Journal of Aerospace Engineering

View full text Add to dashboard Cite

A new type of gust generator generates the airflow oscillation in the wind tunnel through the Coanda effect of the unsteady trailing edge blowing, which has been shown to have strong potential for accurately simulating discrete gusts. It is necessary to study the relationship between the generated gust characteristics and the control parameters of such devices in order to optimize the design performance and improve gust simulation capabilities. By solving the compressible unsteady Reynolds-averaged Navier–Stokes (URANS) equations, the computational fluid dynamics model of the subsonic airflow past the gust generator in the wind tunnel was presented. The effects of jet momentum, frequency, and spanwise blowing ratio on gust intensity, shape, and spatial uniformity were investigated. Results indicate that the intensity of gusts is positively correlated with jet momentum and frequency. The gust shape matches well with the normalized jet momentum coefficient curve. However, when the frequency increases to above 10 Hz, the gust shape differs significantly from expectation due to the appearance of reverse wave peaks. In addition, the mechanism of the impact of the sidewall and partial spanwise blowing on gusts was revealed. In the three-dimensional situation, streamwise vortices are formed on the sidewall and at the spanwise position where the blowing stops, respectively. This results in an increase and noticeable nonuniformity in gust amplitude. When the blowing with a 15% spanwise length near the sidewall is turned off, the gust amplitude at the symmetry plane increases by nearly 40% due to the main vortex being closer to the main flow. The result provides a physical explanation for the availability of this operation to reduce gust attenuation.

show abstract

Section: Unsteady Jet Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Simulations of Vertical Discrete Gusts Driven by Trailing Edge Blowing

Shi,

Lu,

Guo

et al. 2023

International Journal of Aerospace Engineering

View full text Add to dashboard Cite

show abstract

“…For aerodynamic modeling, NAS 2 employs the Vortex Lattice Method, in-house 3D panel theory [51], strip theory (incompressible and compressible aerodynamics) [39], and piston theory [52]. Aerodynamic loads can be imported from MSC NASTRAN [53] and ZONA ZAERO [54] commercial software. To expedite the solution of nonlinear aeroelastic problems, an in-house nonlinear ROM has been developed.…”

mentioning

confidence: 99%

High Aspect Ratio Composite Wings: Geometrically Nonlinear Aeroelasticity, Multi-Disciplinary Design Optimization, Manufacturing, and Experimental Testing

Farsadi,

Ahmadi,

Sahin

et al. 2024

Aerospace

Self Cite

View full text Add to dashboard Cite

In the field of aerospace engineering, the design and manufacturing of high aspect ratio composite wings has become a focal point of innovation and efficiency. These long, slender wings, constructed with advanced materials such as carbon fiber and employing efficient manufacturing methods such as vacuum bagging, hold the promise of significantly lighter aircraft, reduced fuel consumption, and enhanced overall performance. However, to fully realize these benefits, it is imperative to address a multitude of structural and aeroelastic constraints. This research presents a novel aeroelastically tailored Multi-objective, Multi-disciplinary Design Optimization (MMDO) approach that seamlessly integrates numerical optimization techniques to minimize weight and ensure structural integrity. The optimized wing configuration is then manufactured, and a Ground Vibration Test (GVT) and static deflection analysis using the Digital Image Correlation (DIC) system are used to validate and correlate with the numerical model. Within the fully automated in-house Nonlinear Aeroelastic Simulation Software (NAS2) package (version v1.0), the integration of analytical tools offers a robust numerical approach for enhancing aeroelastic and structural performance in the design of composite wings. Nonlinear aeroelastic analyses and tailoring are included, and a population-based stochastic optimization is used to determine the optimum design within NAS2. These analytical tools contribute to a comprehensive and efficient methodology for designing composite wings with improved aeroelastic and structural characteristics. This comprehensive methodology aims to produce composite wings that not only meet rigorous safety and performance standards but also drive cost-efficiency in the aerospace industry. Through this multidisciplinary approach, the authors seek to underscore the pivotal role of tailoring aeroelastic solutions in the advanced design and manufacturing of high aspect ratio composite wings, thereby contributing to the continued evolution of aerospace technology.

show abstract