内流的

The rotational jet and local oxygen enrichment can improve the mixing of oxygen and pulverized coal, but the effect of coal injection is weak on the whole flow field in blowpipe. The mass and momentum transfer near the exit of lance are very strong.

结果表明，氧-煤喷枪的漩流、富氧率等仅在氧枪出口的有限区域内对流场有较大的影响；喷煤对整个直吹管内的流场影响较小，但在氧-煤喷枪出口附近区域会促使气相和煤粉激烈混合，动量和质量传输较强烈。

Fill the role of letter is to pump shell and closed the gap between the shaft from the water pump does not flow outside to not let outside air into the pump.

填料函的作用主要是为了封闭泵壳与泵轴之间的空隙，不让泵内的水流不流到外面来也不让外面的空气进入到泵内。

Fill the role of letter is to pump shell and closed the gap between the shaft, not pump the water does not flow to the outside to not let the outside air into the pump.

填料函的作用主要是为了封闭泵壳与泵轴之间的空隙，不让泵内的水流不流到外面来也不让外面的空气进入到泵内。

The results show that the increasing Marangoni number will lead to more nonlinear distribution of temperature field, but streamfunction of the cell center; vorticity on the wall and peak value of velocity diminish first, then increase, finally lose stability. The thermocapillary convection in the whole liquid zone appears to get stronger along with the augmentation of Prantal number. The effect of increasing of Biot number on temperature and flow fields is not obvious although the convection is strengthened a little. As increasing the aspect ratio A, thermocapillary convection induced by temperature gradient and liquid viscosity becomes stronger.

结果表明：温度场的非线性分布随着Ma数的增大而加剧，但对流涡胞中心流函数、壁面涡量和轴向、径向速度峰值并不象温度场随着Ma数的增大而单调增大，而是先减小，然后增大，最后失稳，表明Ma数对热毛细对流的影响比较复杂，针对不同的物理模型，会导致完全不同的流态；Pr数愈大，流体的热扩散能力在粘性扩散与热扩散能力之比中愈占支配地位，当Ma数一定时，热毛细对流随Pr数的增大在整个液体区域内有增强的趋势；Bi数增大，热毛细对流有所增强，但不甚明显；A的增大使得由温度梯度和流体粘性诱导的热毛细对流随之增强。

Working process of the piccolo injector plasma generator is analyzed and computing model is modified. Improving the piccolo injector model, and having the coupling computation with the model of interior ballistics. From the result of experimentation, the model is validated and can be used in predicting experiment.

修正了D型等离子体发生器的准稳态模型，建立了中心电弧等离子体发生器的准稳态模型；将中心电弧等离子体发生器模拟模型与一维两相流内弹道模型耦合，建立了基于中心电弧等离子体发生器的电热化学炮的内弹道预估模型。

Based on analysis of the current state of the flow pattern modeling abroad and at home, explains the meaning of the mathematical simulation of the flows in the valve.(2) Comparing flow simulation data of jet pump with its experimental one, the feasibility and reliability of FLUENT used for flow simulation are proved.(3) Based on the characteristic of valves, the fluid field analysis of specific ring-spray type flow-adjustable is finished. The valve structure is optimized to meet the need, which makes it have such advantages:(1)smaller vortex area and faintish vortex intensity, so the vibration of vortex is controlled effectively;(2)the pressure is distributed more equality, the transition area is larger.

论文的主要内容包括：(1)简述了阀门研究的现状与发展，在分析与总结国内外流体流动模拟研究的基础上，探讨开展阀门内水流运动数值模拟的意义；(2)对特定型号的射流泵进行了内部流场的数值模拟研究，并与实验数据相比较，验证了应用Fluent进行数值模拟的可行性和可靠性；(3)针对调流阀的特点，对特大口径环喷式流量调节阀进行流场计算，其设计指导思想如下： 1、控制旋涡，减小旋涡区，减小涡的强度； 2、控制压力分布，使阀体受力更均匀，改善局部应力状态，提高阀门使用的安全性； 3、最小绝对压力高于水的汽化压力，不产生汽蚀。

The plastic go down the hopper smoothly and is gripped by the thread of the screw. It is forced to go toward the direction of the gear end along with the rotation of the screw. A mechanical transferring process is formed. During the running of the plastic from the feed port to gear end, a high pressure is formed in the process of plastic curing due to the gradual decreasing of the thread depth and the resistance of filter gauze, splitter plate and gear end. The high pressure helps to press the raw material and improve its heat conductivity performance and the quick melting of the plastic, at the same time, the gradual increasing pressure can help the gas which is among material particles exhausted from the air holes.

在压力升高的同时，塑料一方面被外部加热，另一方面塑料本身在压缩、剪切、搅拌的运动过程中，由于内磨擦力也产生了大量的热，在外力和内力的联合作用下，塑料温度逐渐增高，其物理状态也经历了玻璃态--高弹态--粘流态的变化，一般地说来，在加料段中主要是玻璃态，在螺杆螺纹逐渐减少的中间部分压缩段中，物料主要处于高弹状态，同时也逐渐的熔融，而物料到压缩段后部和化段作用处于粘流态了，这时我们称塑料已完全塑化了，由螺杆推力作用将塑化的塑料定压定量的从机头中挤出。

Aiming to a method for the synthesis of silicon nitride powder by direct nitridation process based on fluidization technology, a two-dimensional mathematical model of thermal process in a suspended bed was established, the thermal process was simulated based on the commercial CFD software FLUENT, and the effects of the flow velocity of nitrogen gas, the ratio of particle to gas and nitridation temperature on the temperature of the bed and the conversion rate of silicon were analyzed.

针对基于流态化技术利用硅粉直接氮化合成氮化硅粉的新工艺，建立了悬浮床内热过程的二维数学模型，并借助CFD商业软件FLUENT对悬浮床内热过程进行了数值模拟，分析了氮气速度、粉气比和氮化温度等因素对温度场和硅转化率的影响。

By analyzing the results of simulation and experiment, a series of new phenomena were found. There is an inner boundary within the rotational flow field of cyclone. The velocity head is zero on the inner boundary.

通过对仿真结果的分析，并结合试验数据，揭示出一系列新的现象，主要归纳为：旋风分离器内的旋转流场中存在一内边界，其速度头为零。

Two test pieces with satin surface and rib surface were designed under conditions of different distribution of heat flow density and different air flux.

我们对两块冷板实验件(内表面光滑与内表面带肋)就热流均匀分布与热流局部分布、不同空气流量的情况下进行了试验研究，然后采用三维通用形式N-S控制方程，建立适于工程应用的冷板三维流固耦合传热过程的数理模型。

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！