Publication detail

Flow Pattern Generated by a Radial Jet

KREJČÍ, V. KOŠNER, J. KAPLAN, M. PEČIVA, T.

Original Title

Flow Pattern Generated by a Radial Jet

Type

conference paper

Language

English

Original Abstract

The article is focused on a radial jet investigation. The radial jet is one of the most important features of a reinforced exhaust system known as the Aaberg exhaust hood. In order to describe a radial jet flow pattern, measurements of radial jet characteristics, such as velocity decay, spreading rate and turbulence intensity profiles across the jet, are needed. An experimental setup has been built up. It allows to perform the measurements under various both geometrical (jet width and orifice diameter) and initial conditions (turbulence intensity, air speed, and temperature at the inlet). The setup consists of an air terminal that creates the radial jet, a ductwork with a fan unit and a heat exchanger. The basic dimensions of the air terminal are 200 mm in diameter and the width of terminal nozzle is 4 mm; both of them are adjustable. The flow rate can be varied from 50 m3/h to 1200 m3/h. Data acquisition system is based on a computer and it enables to store and evaluate data from all measuring devices and sensors in real time. For the basic arrangement, a set of measurements were undertaken and results of that were compared with available literature. The radial jet was also simulated numerically by means of a commercial CFD code with the aim at using this tool for further development and optimisation of radial jet reinforced exhaust system. Comparison of the results, both experimental and numerical, with available expressions and data for velocity decay shows as much as 30 % discrepancy.

Keywords

Radial Jet, CDF, Ventilation, Velocity Profile, Velocity Decay, Spreading Angle

Authors

KREJČÍ, V.; KOŠNER, J.; KAPLAN, M.; PEČIVA, T.

RIV year

2006

Released

1. 5. 2006

Publisher

American Industrial Hygiene Association

Location

Chicago, USA

Pages from

1

Pages to

7

Pages count

7

URL

http://www.aiha.org/aihce06/handouts-vent.htm

BibTex

@inproceedings{BUT19259,
  author="Vladimír {Krejčí} and Jan {Košner} and Martin {Kaplan} and Tomáš {Pečiva}",
  title="Flow Pattern Generated by a Radial Jet",
  booktitle="Proceedings of 8th International Conference VENT2006",
  year="2006",
  pages="7",
  publisher="American Industrial Hygiene Association",
  address="Chicago, USA",
  url="http://www.aiha.org/aihce06/handouts-vent.htm"
}