文丘里管

In calculational methods, the aforementioned mass flow rate measurement model is adopted to measure the two-phase flow, which is based on differential pressure.

在计算方法上，采用本文提出的基于文丘里管的质量流量模型对部分分离后的油水两相流进行了测量。

Experimental measurement of oil-water two-phase flow was carried out by Venturis on 25 and 40mm diameter pipes, respectively.

实验采用25和40mm两种管径的文丘里管进行了油水两相流流量测量。

Venturis with different diameters are applied to the oil-water flow using the flow measurement model.

对建立的流量测量模型，分别采用两种不同管径的文丘里管对油水两相流进行了实验研究。

Meanwhile, according to the need of Venturis, a SVM-based water-oil flow pattern identification method is given, with which characteristic vectors can be obtained and used to identify flow patterns, thus giving good results of both separated and distributed flow pattern identification.

同时，根据文丘里管流量测量需要，提出了基于SVM的油水两相流流型识别方法，给出了特征向量提取方法，并将其用于流型识别，较好的取得了分层流和分散流型识别结果。

Mathematical model for discharge coefficient of orifice - plate flow - meter is presented and tested on the basis of literature data.

化工生产过程中，常常用到孔板流量计或文丘里管以测定管路中的流体流量。

It is proved that the model is in good agreement with the literature data. Standard error is less than 0.01(σ.01). Using this model, process simulation of the experiment of the test of orifice - plate flow - meter is carried out on computer.

在孔板流量计或文丘里管的计算过程中，习惯上常常使用查表的方法以确定孔板流量计的流量系数，但是，在化工过程模拟计算过程中，这种方法却难以奏效。

Can automatically design the best Venturi tube, simply import the parameter.

详细说明：能自动设计出最佳的文丘里管，只需进口的参数即可。

Based on the analysis of the dynamic differential pressure signal of two-phase flow through Venturi tube, the various flowrate equations were established according to the flow pattern.

论文通过对文丘里管前后两端的动态差压信号的分析和处理，根据用波动系数确定的流型，建立了不同流型下的各种流量测量公式。

Oil-water two-phase flow ; Venturi tube ; Hilbert-Huang transform ; support vector machine

油水两相流；文丘里管； Hilbert-Huang变换；支持向量机

Gas phase flow rate of two-phase flow was studied based on homogeneous flow model with slip model used void fraction sensor and venturi tube in this paper.

本文利用文丘里管和含气率传感器对空气水两相流气相流量计算方法进行了研究，在均相流模型基础上考虑了滑速比因素造成的影响，探讨了两相流气相流量计算方法。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。