Numerical study on aerodynamic drag and noise of high-speed pantograph by introducing spanwise waviness

It is noteworthy to explore potential measures for further reducing the aerodynamic drag and noise of high-speed pantographs. This paper proposes a method introducing spanwise waviness into upper lower arms. The improved delayed detached eddy simulation (IDDES) Ffowcs Williams Hawkings (FW-H) equation are used flow field sound propagation calculation, respectively. effects wavelength, wave amplitude inclination on force radiated cylinder were firstly investigated, then characteristics pantograph with without configurations compared. Results show that appropriate can diffuse negative pressure core area in wake, reduce amplitude, suppress vortex shedding weaken fluctuation force, resulting reduction noise. For by waviness, when ratio wavelength diameter 1.2 1/8 respectively, reduced 1.58% 1.16 dBA,