With the gas flow calibration system based on the critical flow nozzles and positive pressure method,the experimental research has been carried out and a calculation formula has been obtained after deducing the fitting model of expansibility factor of cone flowmeters theoretically. Comparing with standard orifice,venturi,and three formulas for the cone flowmeters achieved from research organization abroad,the prediction curves and relatively error curves of the expansibility factor with different equivalent diameter ratios have been depicted.
为提高内锥流量计气体流量测量的准确性,探索可膨胀系数的高精度计算模型,设计了内锥流量计实验样机,利用正压法临界流音速喷嘴气体流量标准装置开展了实验,根据可膨胀系数的拟合方案,获得了高准确度的计算公式;与经典标准孔板公式、标准文丘里管公式及国外研究机构给出的三个内锥流量计公式进行了比较,绘出不同节流比下各公式可膨胀系数的预测曲线及相对误差曲线,得出当流动条件相同时,对于同一节流比及同一等熵指数,研究获得的可膨胀系数公式均方根误差优于0.7%。
参考来源 - 内锥流量计可膨胀系数实验研究·2,447,543篇论文数据，部分数据来源于NoteExpress
If the critical flow meter is used, the measure isn t affected by the variation.
采用临界流量计后，流量计下游压强的变化不会影响流量的测量。
The critical flow pressure is a characteristics parameter which does not change with reservoir pressure.
临界流压是地层的特征参数，不随地层压力发生变化。
Critical flow velocity is an important factor in slurry pipeline transportation. Now, there is not still an universal formula.
临界流速是浆体管道输送的一个重要因素，目前尚无普遍的使用公式。
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