Abstract
The characteristics of Borda inlets when used as flowmeters are investigated, and the parameters which have to be taken into account when predicting the calibration coefficient (commonly referred to as the 'discharge' coefficient) of any particular device are determined. Standardised positions for locating the pressure tappings are proposed, and the variation of discharge coefficient with Borda diameter and relative thickness of the inlet edge is established. The modified method of using a Borda inlet which is presented avoids the need to use any corrections for compressibility effects, but the relationships found between discharge coefficient and the various parameters have been obtained for tests in air only, and so should not be used for any compressible fluid with an appreciably different specific heat ratio.
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