查询词典 choke flow

On the basis of the conservation equation of continuous medium and in combination with mechanics of fluid through porous media and the heat transfer theory in porous media, conservation equations in porous media (continuous equation, momentum equation and energy equation ) are derived, When constructing the downhole temperature model, heat transfer in a wellbore is considered as the heat transfer in a vertical tube, the flow in a wellbore considered as sufficiently parallel flow, heat transfer in injection zones considered as heat conduction and convection in porous media, the flow in injection zones considered as flow through porous media, heat transfer in adjacent rocks considered as heat conduction in porous media.

在建立井下温度场模型时，把井筒的传热看作是竖直圆管中传热问题，把井筒的流动看作是充分发展的层流流动；把注入层中的传热看作是多孔介质中导热和对流的传热问题，把注入层中的流动看作是渗流；把围岩中的传热看作是多孔介质中导热问题。

Comparison between the velocity distributions at the different flow rate conditions showed that increasing the flow rate was help to improving the velocity distribution. The periodic mean field on r-6 plane at different axis positions showed that the flow within the vaned diffuser, especially within the inlet region, was periodic unsteady when impeller located at the different circumferential position, just as the flow within the vaneless diffuser.

有叶扩压器内平均流场的分析表明，在定常流动的假设下，不同流量工况下有叶扩压器的内部流动也呈现为沿轴线向后盘方向推移流动状况逐渐恶劣的分布规律，表明二元叶片构成的平行直壁有叶扩压器对轴向不均匀流动的掺混作用仍然不大。

Numerical simulation results show that the typical features of primary flow, secondary flow and velocity redistribution in natural river bends are closely related to the special planform and flow depth conditions of natural river meanders. The lateral redistribution of flow is significant when water depth is small. The main stream approaches the concave bank upstream the bend vertex when river width is small.

数值试验结果表明，自然河流河弯中的主流、二次环流和流速重分布特征是与自然河弯的特殊几何形态特征、水深条件紧密相连的，水深越小则流速沿横向的重分布越为显著；河宽越小则水流动力轴线在凹岸的顶冲点越为提前。

First, the traffic flow time series chaotic feature is extracted by chaos theory. pretreatment for traffic flow time series, and the wavelet neural networks model was build by this. Second, the chaotic mechanism and the chaotic probability is described. Based on chaotic learning algorithm, and the wavelet neural networks fast learning algorithm of traffic flow time series is designed based on chaotic algorithm. Last, a single-step and multi-step prediction of traffic flow chaotic time series is researched by BP neural networks, wavelet neural networks and wavelet neural networks based on chaotic algorithm. The results showed that the wavelet neural networks predictive performance is better than the BP networks and the wavelet neural networks by the simulation results and root-mean-square value.

首先，通过混沌理论提取了交通流量时间序列的混沌特征，并在此基础上建立了小波神经网络交通流量时间序列模型；接着，阐述了混沌学习算法的混沌机理、混沌产生的概率，设计了基于混沌算法的小波神经网络交通流量混沌时间序列快速学习算法；最后利用交通流量混沌时间序列对BP网络、非混沌算法的小波神经网络以及基于混沌算法的小波神经网络进行了单步预测和多步预测，并对预测结果的仿真图和真实值与预测值的方均根进行了比较，结果表明基于混沌学习算法的小波神经网络的预测性能明显优于应用BP网络和非混沌算法的小波神经网络。

The single-pole, double-throw switch can be wired to start or stop a motor when a flow or no flow condition exists or actuate an alarm when flow is inadequate. Turns off alarm when adequate flow is restored.

当存在流量或无流量情况，或当流量不正常需要启动警报器时，单刀双掷开关可以连接电线以启动或关闭电机运转，并且当流量恢复正常时关闭警报器。

Can also be water in the system operating conditions change to maintain constant flow, in the system, it can all slip constant flow, achieve a balanced flow distribution may also be subject to change and regulate the flow of the slip road, achieve dynamic balance.

也可以在系统水利工况变化时保持流量恒定，在系统中它既可恒定各个支路的流量，实现流量的均衡输配，也可以随时改变和调节各支路的流量，实现动态平衡。

The rotary character of flow can be seen clearly through tangent plane flow field. The turbulent intensity of the inner-straight flow is lower than the outer-swirling flow.

模拟还得到了该流场存在两个较大的外回流区，通过切面流场可以很清晰地看出气流的旋转特性。

For acquiring the railway passenger's OD matrix accord with factual traffic flow, we utilize the method of traffic flow suit to railway fieldwork. Being directed against the errors of theory traffic flow and factual traffic flow and make use of error co...

为求出与实际的交通量相匹配的铁路旅客OD流量，利用和铁路运输现场实际工作相吻合的交通配流方法，针对理论分配交通量和实际交通量的偏差程度、采用适时修正的方法进行迭代运算，直至得到一个满意的解为止。

In this paper,the kinematic equations of flow of Newtonian fluid of helical flow in eccentric annulus were transformed by the method of undetermined coefficient,the calculation formula of pressure gradient of flow of Newtonian fluid of helical flow in eccentric annulus was obtained.

本研究利用待定系数法对 Newton 流体偏心环空螺旋流动的运动方程进行了变换，得到了给定流量情况下 Newton 流体偏心环空螺旋流动的压力梯度的计算公式。

The asymmetric coefficients of debris flows are quite different in different area: large asymmetric coefficients of debris flow with low resistance; small asymmetric coefficients of debris flow with high resistance. The asymmetric coefficients of debris flow could be used to classify resistance characteristics of debris flow accurately and the resistance law of viscous debris flows was got by asymmetric coefficients.

泥石流的不均匀系数在不同的泥石流地区有很大的不同：不均匀系数小的地区阻力大，而不均匀系数大的地区阻力小，因此可以用不均匀系数划分泥石流沟的阻力特征，从而得到能兼顾所有不同地区的泥石流阻力规律。

But this is impossible, as long as it is engaging in a market economy, there are risks in any operation.

但是，这是不可能的，只要是搞市场经济，是有风险的任何行动。

We're on the same wavelength.

我们是同道中人。