This study focuses on multi-holed orifice plates, which have superior flow measuring characteristics as compared to their conventional counterparts. However, literature is scant on quantitative parametric investigations. In this experimental study, the performance of a multi-holed orifice plate is evaluated for variable number of holes (n), equivalent diameter ratio (EDR), compactness ratio (C), plate thickness ratio (s/d) and upstream developing length (L/D) in developing flow regimes for the Reynolds number range of 24,500–55,500 by using Central Composite Design. A total number of 324 experiments were performed. It was found that EDR has the most significant effect on pressure loss coefficient, followed by ‘n’ and ‘C’. Moreover, it was found out that single orifice (SO) and multi-holed orifice (MO) have almost the same pressure losses for the same value of EDR/β. However, flow develops quickly for MOs. Higher values of coefficient of discharge were observed in the case of MOs as compared to the SOs with little effect of upstream disturbances. The effect of developing length is significant on the accuracy of orifice meter. However, when the multi-holed orifice plates are installed at 2D upstream length, the effect of upstream disturbances are diminished. This result provides the flexibility of installation, which means that multi-holed orifices can be installed at 2D. The experimental data is in good agreement with literature. Finally, an optimum orifice plate (5,0.4,0.7) was selected for flow developing region with minimum pressure loss coefficient based upon the experimental results.

这项研究的重点是多孔孔板，与传统的孔板相比，它们具有出色的流量测量特性。但是，关于定量参数研究的文献很少。在该实验研究中，针对可变数量的孔（n），当量直径比（EDR），紧密度比（C），板厚比（s / d）和上游显影长度，评估了多孔孔板的性能。 （L / D）通过使用中央复合设计在发展雷诺数范围为24,500-55,500的流动状态中进行。总共进行了324个实验。发现EDR对压力损失系数的影响最大，其次是“ n”和“ C”。而且，已经发现，对于相同的EDR /β值，单孔口（SO）和多孔孔口（MO）几乎具有相同的压力损失。但是，MO的流量发展很快。与SO相比，在MO的情况下观察到较高的放电系数值，而对上游干扰的影响很小。显影长度的影响对孔板流量计的精度影响很大。但是，当多孔孔板以2D上游长度安装时，上游扰动的影响会减小。该结果提供了安装的灵活性，这意味着可以在2D位置安装多孔孔口。实验数据与文献相吻合。最后，一个最佳孔板（5,0.4,0。