Abstract
The present study experimentally and numerically investigates the feasibility of applying multiple dielectric barrier discharge (multi-DBD) plasma actuators to reduce wind loads and modify local flow field on the roofs of low-rise buildings. Four arrangements of multi-DBD plasma actuators are placed on the roofs and induce four directions of wall jets. The results show that mean and peak negative pressure coefficients are negative no matter the plasma actuation is on or off. These wall jets decrease the absolute values of these pressure coefficients in different roof regions and succeed in modifying the local flow around the roof. The wall jet blowing from the trailing edge to the leading edge has the best effect on wind loads, since the absolute values of mean and peak negative pressure coefficients are respectively reduced by about 20% and 12% near the leading edge. The different variations of wind loads and the local flow for all arrangements are due to the compact of the directionality of the wall jets. The wall jet produces a strong suction region at the beginning of the wall jet, which leads to an obvious enhancement of wind loads in this region. Meanwhile, the wall jet induces a strong pressure region at the back of the wall jet, resulting in an apparent decline of wind loads.
Highlights
The wind load has been gaining particular attention in structural wind engineering, since it often damages the building structures, for example the roofs can be overturned in a wind storm
Zhang et al.[4] reported that the spanwise suction control reduced the fluctuating aerodynamic forces and mean drag on a static bridge deck. Their numerical simulation results indicated that this active flow control method triggered and amplified the most unstable secondary instability and suppressed the shedding of spanwise vortexes in the wake flow
The increasing trend of |Cp,mean| at Section 2-2 from the experiment and simulation is identical to the experimental result of a similar cube with an uniform flow by Castro and Robins,[32] implying that the oncoming flow could be approximately regarded as an uniform stream
Summary
The wind load has been gaining particular attention in structural wind engineering, since it often damages the building structures, for example the roofs can be overturned in a wind storm. Akbıyık et al.[13] used intermittent DBD plasma actuators to get a about 14% decline of drag coefficient on a circular cylinder These applications suggest us a good idea to explore appropriate plasma actuator arrangements, which can be applied to manipulate wind loads and modify local flow on the roof of a low-rise building. This is an asymmetric DBD plasma actuator. We conduct experimental and numerical investigations in which four arrangements of multi-DBD plasma actuators are selected to alter mean and peak negative pressure coefficients and local flow on the flat roof of a low-rise building. In the final section, changing regulations and physical features are summarized to provide theoretical guidance for future related applications
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