Wind tunnel study on vortex-induced Helmholtz resonance excited by oblique flow

Yu, Shice

doi:10.1016/j.expthermflusci.2015.12.008

Cited by 4 publications

(1 citation statement)

References 16 publications

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“…This test has the advantages of a well-developed experimental method, increased measurement accuracy, and ease of airflow parameter control and is basically unaffected by weather. 14–18…”

Section: Introductionmentioning

confidence: 99%

Impact of the trailing edge shape of a downstream dummy vehicle on train aerodynamics subjected to crosswind

Huo

Liu

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part F:

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Wind tunnel tests for trains under large yaw angles are usually limited due to the width of the wind tunnel. Therefore, the leading car and a downstream dummy vehicle model are often employed instead of a real train, but there are no clear regulations regarding the shape of the end of the dummy vehicle. This paper studied the impact of the trailing edge shape of the downstream dummy vehicle on train aerodynamics subjected to crosswind based on the shear-stress-transport k-ω turbulence model of the delayed detached eddy simulation. Three types of end shapes, namely the rectangular end shape, the arc end shape, and the streamlined end shape were chosen for comparison, and the simulation results of the three-car-group train were selected as the benchmark. First, the reliability of the numerical method was validated by wind tunnel tests. Then, the aerodynamic coefficients under yaw angles of 0°–60° and the surface pressure distributions and flow structures around the train under the yaw angle of 60° of the head cars with different end shapes were compared and analyzed.

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“…This test has the advantages of a well-developed experimental method, increased measurement accuracy, and ease of airflow parameter control and is basically unaffected by weather. 14–18…”

Section: Introductionmentioning

confidence: 99%

Impact of the trailing edge shape of a downstream dummy vehicle on train aerodynamics subjected to crosswind

Huo

Liu

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part F:

View full text Add to dashboard Cite

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Experimental study on the effect of wind angles on pressure distribution of train streamlined zone and train aerodynamic forces

Zhang

Yang

Liang

2018

Journal of Wind Engineering and Industrial Aerodynamics

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Short cylindrical nozzles in a jet-driven Helmholtz oscillator

Абдрашитов

Марфин

2020

Physics of Fluids

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The present paper elaborates on the experimental study of jet-excited pressure fluctuations in a Helmholtz oscillator model with two openings in a cylindrical cavity. The length of the cylindrical nozzle in the front cover ℓN normalized by the nozzle diameter dN was ℓN/dN = 0.125, 0.33, 0.47, and 0.67. The diameter of the outlet opening in the back cover dOUT was in the range dOUT/dN = 1–2.5. The length of the cylindrical cavity LCH determined the jet length LJET in the spacing between the covers, LCH/dN = 0.5–3.5. The amplitude–frequency spectra were studied when the oscillator configuration was changed in the indicated intervals. From the generation amplitude, the best ratio of the sizes of the nozzle, chamber, and outlet was determined. The appearance of the jet tone of the hole and the alternation of acoustic modes were observed with a smooth increase in the Reynolds number to ∼8 · 104. The measurements showed very high amplitude of pressure fluctuations in an oscillator with a short nozzle and a short chamber at a significant jet velocity. A slight increase in the length of the chamber led to a rapid decrease in the generation amplitude. It is determined that the tone frequency is usually much lower than the resonance frequency in the chamber. Moreover, the tone frequency gradually increases with increasing jet velocity, while the resonance frequency remains unchanged, close to the natural frequency of the cavity chamber.

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Wind tunnel study on vortex-induced Helmholtz resonance excited by oblique flow

Cited by 4 publications

References 16 publications

Impact of the trailing edge shape of a downstream dummy vehicle on train aerodynamics subjected to crosswind

Impact of the trailing edge shape of a downstream dummy vehicle on train aerodynamics subjected to crosswind

Experimental study on the effect of wind angles on pressure distribution of train streamlined zone and train aerodynamic forces

Short cylindrical nozzles in a jet-driven Helmholtz oscillator

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