Fundamental Research on Drag Characteristics of Jet Impinging to Perforated Walls

Abstract

To minimize sa fe distance from hydrogen stations, drag characteristics of jet impinging to perforated walls were investigated. The non-perforated wall and the perforated walls with five different opening rates were tested. The load cells supporting perforated walls were used to measure the drag. The drag was normalized by the non-perforated wall's drag. The drag characteristics are classified into three regions. The normalized drag is increased up to the normalized distance 200, almost the constant between 200 and 250, and increased again from 250.