Airflow Visualization and Measurements of Fluctuating Flow Using Particle Image Velocimetry (PIV) for a Model House with Single-sided and Cross-ventilation in a Large Boundary-layer Wind Tunnel

摘要

Particle image velocimetry (PIV), which has recently attracted considerable attention, was originally developed by improving PC performance and image processing. PIV is a noncontact method that measures the airflow velocity at multiple points simultaneously, thus, it is preferred over conventional anemometers. Cross ventilation is a nonsteady-state phenomenon, and to understand it better, the wind flow and velocity have to be quantified. This study describes the airflow distribution in a simple cross-ventilated house model by using PIV and a large-size boundary wind tunnel. Two house models were used in the experiments. The first model has two openings on opposite walls, and the second has two openings on the same wall. The visualization of cross ventilation is performed by using three lasers. The location of the openings and the wind direction are the experimental variables. The Wind velocity and turbulent kinetic energy distribution in and around the model are reported.