-This paper present a numerical experimentation of the behaviour of the discharge coefficient and the effect of four perforated plates like flow conditioners on the discharge coefficient for flow measurement accuracy. Three of the plates are described by the Standard ISO5167 and the fourth one is proposed for study. The flow is subject to two disturbers namely 50% closed valve and 90° double bend in perpendicular planes. The turbulent flow is examined in conduit with an inner diameter of D=100mm. The diameter of orifice meters are respectively d=50, 60, 70 and 75mm which done for β ratio d/D respectively the values of 0.5, 0.6, 0.7 and 0.75. The orifice meters are located in conduit at different stations z/D downstream the disturbers. The flow is examined with air at Reynolds number Re=2.5x105 . The results showed that the perforated plates have significantly reduced the error on the discharge coefficient. Indeed, the errors recorded downstream disturbers are superior to 12%. Downstream the perforated plates used separately the errors on the discharge coefficient are reduced to a value inferior to 1% for the four plates. It is noted that the standards ISO5167 and AGA3 stipulate that the error on the discharge coefficient Cd must be less than 0.5% for better flow measurement accuracy. By comparing our results with this condition we found that the error obtained on the discharge coefficient with the four perforated plates are substantially reduced especially downstream station z=25D (z =19D downstream disturbers). However the fourth proposed plate with its height porosity produces less lose pressure than those of the other three plates. This is good conditions of exploitation for some installation where height lose pressure are not tolerated.
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