critical flow nozzle 临界流喷嘴
sub-critical flow 亚临界流 ; 次临界流
critical flow measurement 临界流量测量
real gas critical flow coefficient 真实气体临界流量系数
critical flow rate 临界流量 ; 临界流 ; 临界流速
critical flow prover 临界流检测计 ; 临界流量计
Critical flow function 临界流函数
critical flow value 流量临界值 ; 临界流动值
transient critical flow 瞬态临界流
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
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。
The effect of some parameters of the system on the values of critical flow velocity is discussed according to the analytical expressions derived.
利用临界流速公式系统地分析和讨论扭转刚度、重力系数和轴向预紧力对管道临界流速的影响特性。
The experimental result shows that the corrosion rate of carbon steel increases with the increasing of flow velocity, and there is a critical flow velocity.
结果表明：随着相对流速的增大，碳钢的腐蚀随之加剧，并发现存在一个临界相对流速值。
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