Direct numerical simulations of flutter instabilities over a vibrating turbine blade cascade
نویسندگان
چکیده
This paper presents direct numerical simulations (DNS) on unsteady turbulent flow in a vibrating low-pressure turbine blade cascade to predict the flutter instabilities and explores effects of oscillations structure separation point. The spectral/hp element method is employed for three-dimensional domain. enables capturing more details about vortex generations compared URANS methods. can aid understanding physics these complex fluid–structure interaction problems while it requires much less computational time other DNS models. vibration frequency varied from 5.2 Hz 10.3 with maximum amplitude 3% chord length at tip. results illustrate that generation becomes stronger over blades higher frequencies stationary ones. main reason additional recirculations oscillating disturbance due its interactions shear-layer cascade. It seen shedding growing around trailing edge become suction surface blade. occurs Ssep?S0=0.391, 0.372 f=5.2Hz.
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ژورنال
عنوان ژورنال: Journal of Fluids and Structures
سال: 2021
ISSN: ['1095-8622', '0889-9746']
DOI: https://doi.org/10.1016/j.jfluidstructs.2021.103324