Experimental Investigation of the Pressure Characteristics and the Flowfield in the Square Duct Flow with an Inclined Jet Injection

Autor:	Ryota Yano, Akisato Mizuno
Rok vydání:	1999
Předmět:	geography Materials science geography.geographical_feature_category Mechanical Engineering Nozzle Square duct Mechanics Condensed Matter Physics Inlet Theory based symbols.namesake Jet injection symbols Model test Duct (flow) Coandă effect
Zdroj:	TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B. 65:138-143
ISSN:	1884-8346 0387-5016
DOI:	10.1299/kikaib.65.138
Popis:	Experimental study is carried out to clarify the flowfield of the duct flow with an inclined jet injection, as the model test of a tunnel ventilation facility. A 7700 mm long duct with a 230 mm×230 mm square cross section is constructed, and an injection nozzle with 20 mm×230 mm outlet with the angle of 30° is installed at 2100 mm from the inlet. In addition to full span injection cases, the nozzle with 40% span (symmetric) or 50% span (one side) is installed to observe the effect of the outlet span on three dimensionality of the flowfield. Measured pressure gains under various flow ratios showed good agreement with the theory based on the law of momentum. The velocity distribution with full span injection showed the flowfield in which high speed regions are confined at the ceiling due to Coanda effect, while the partial injection cases revealed stronger down wash.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3d1e7bd503b741403a05569966ea3d5e https://doi.org/10.1299/kikaib.65.138 Zobrazit plný text záznamu