Authors: M.R.L. Bantle, E.M. Barber and G.R. Bayne
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Published in: CBE Journal » CBE Journal Volume 33 (1991)

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Description: The aerodynamicmoment acting on a hinged baffle of a passivelyautomaticair inlet was measured for three different flow configurations at pressure drops of 5, 20, 35 and 50 Pa. In two of the configurations, air entered the inlet from a plenum above the inlet, therebysimulating air entry from an attic. In the third configuration, air entered the inlet from a plenum beside the inlet, thereby simulating a sidewall inlet.When the inlet pressure drop was maintained constant, themoment actingon the inlet baffle due to airflow throughthe inlet (aerodynamic moment) decreased as the airflowrate increased for all threeinlet configurations. This result indicates that a restraint system which exerts a constant counter moment may not be workable if a constant pressure is required. However, the condition of a constant pressure with a constant counter moment may beapproached with the two attic inletconfigurations provided the maximum inletopening is restricted. The open wall configuration inlet is not suitablefor use as a passively automatic inlet because the aerodynamic moment de creased very sharply for increasing airflow ratesevenwhen the inlet was only20%open.A numerical model was developed which accu rately predicted the aerodynamic moment on the baffles under conditions of low airflow rates. However, the model was not accurate for higher flow rates. It is believed that separation within the flow channel, which could not be accounted for in the model, was the major reason for thepoorperformance of the model at higherflow rates.

Citation: M.R.L. Bantle, E.M. Barber and G.R. Bayne 1991. Analysis of passively automatic air inlets for livestock buildings. Canadian Agricultural Engineering 33(2):363-371.
Volume: 33
Issue: 2
Pages -
Date: 1991
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Type: Text.Article
Format: PDF
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Coverage: Canada
Language 1: en
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Rights: Canadian Society for Bioengineering
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