Authors
Terje L Andersen, Jasna B Jakobsen
Publication date
2008
Journal
Proc. 6th Int. Colloquium on Bluff Body Aerodynamics and Applications, Milano, Italy
Description
The present paper summarises static mean response coefficients from dynamic cable model tests, carried out in the critical Reynolds number range. Response data is obtained from an elastically supported cable section model with full scale diameter for typical bridge stay cables (160mm). The tests were performed at the National Research Council (NRC), Canada in 2001. The analysis covers a total of 337 recorded time series of wind excited response in the region of critical Reynolds number. Dynamic tests was performed at three different inclinations to the mean-wind velocity vector ie inclination: 35◦, 45◦ and 60◦ in wind flows of 10− 38m/s. The coefficients obtained are compared to force coefficients from surface pressure data from static scale-model tests performed at NRC in 2002. Surface pressure data from fixed model tests cover the interval of equivalent inclinations from 55◦ to 90◦. Wind velocities in the range 20− 100m/s reproduce similar wind conditions as for the dynamic tests. Static coefficients are presented based on the wind-flow component normal to the inclined cable axis as normal coefficient CN and cross-flow lift coefficient CL. The commonly applied ESDU recommendations for two-dimensional flow is compared to available data. For the general three-dimensional flow conditions around inclined cylinders, an alternative expression for the drag normal coefficients throughout the critical Reynolds number range is presented. The suggested expression uses 7 parameters to fit coefficients both from static surface pressure tests and dynamic response tests with good accuracy during the dragcrisis transition.
Total citations
Scholar articles
TL Andersen, JB Jakobsen - Proc. 6th Int. Colloquium on Bluff Body Aerodynamics …, 2008