Abstract
Recently, it becomes imperative to evaluate fluid-induced noise for automobiles in operation as well as aero-dynamics performance. Though it is difficult to apply CFD analysis actual design because of a lot of computation abilities, we have to still rely on confirmation test employing wind tunnel, at present. For wind tunnel facilities to measure noise, open wind tunnels are generally used with anechoic room. It requires large anechoic room as well as more powerful blowers to compensate pressure drop due to anechoic room. In order to cape this problem, authors have been developing an unique technique, noise measurement trough, for wind tunnel to enable noise measurement at smaller closed type wind tunnel with pipes and gaps than open wind tunnels, as same as usual slotted wall. This paper describes this technique with some experimental data.
