研究了影响中心回流区的主要因素。
The main factors which affect the center reflux area are investigated.
在燃烧器出口钝体下游轴向速度为负，形成回流区。
At the exit of the bluff-body, recirculation area is formed because of the negative downstream axial velocity.
在喷口后的背风区，存在具有低压和回流区的尾迹。
A wake flow with relatively lower pressure and recirculation zone exists on the lee side of the injector.
得到了燃烧室内回流区再附长度及速度分布的数值解。
Numerical solutions for retouchment length and velocity-distributions -were obtained in the recirculating zone of the combustion chambers.
电磁搅拌改变结晶器内流场形态，减小回流区和冲击深度。
The flow pattern greatly varies and the circumfluence region as well as the jet impinging depth decrease with the effect of electromagnetic stirring.
燃烧火焰基本上位于回流区所在的位置，火焰在回流区被稳定。
The flame is mainly located in the recirculation region where the flame is stabilized.
氩气的分布不均匀，上回流区钢液的含气率大大高于下回流区。
Argon bubbles distribute unevenly and the gas holdup of liquid steel in the upper region is far higher than that of the lower region.
计算结果表明，由于射流之间的相互作用，在炉膛后面存在回流区。
The results showed that there was the recirculation zone in the furnace due to the interaction of the jets.
此外，本文还重点分析了钝体及旋流二次风速对回流区尺寸的影响。
Furthermore, the influence of bluff body on the size of circumfluence area and the velocity distribution near the bluff body is researched.
双流道叶轮内流动也不均匀，但没有出现明显的回流区，流态较好。
In the double-channel impeller, the flow has better flow pattern without obvious back-flow area.
另外，在出料直管内形成一个回流区，易造成出料口堵塞，也会产生噪声。
In addition a reversed flow was formed in the outlet, which could cause a block and produce noise.
分析了液排渣粉煤燃烧器内的流体流动问题，着重分析了中心回流区及其作用。
The flow of fluid in the entrained slagging coal powder combustor are analysed. Specially, the center reflux area and its effects on the flow of fluid slag are analysed.
本文在实验的基础上对回流区的分布、形状、大小、回流率及其作用进行了分析。
Based on tests the distribution, shape and size of reflux area, reflux rate and its effects are analysed in this paper.
简单环形挡渣板也能产生环形回流区，在旋风燃烧室设计中可取代锥形缩口挡渣板。
Annular reverse flow zone can be found too in the combustor with the flat-straight slag baffle.
受喷嘴区高速射流的影响，喷嘴上方固体颗粒呈向下流动趋势，形成一个诱导回流区域。
Induced by the high-speed feed jet flow, the solid particles above the feed nozzle tended to flow down, and a reverse flow zone was formed along the riser wall.
航空喷气发动机燃烧室中广泛采用叶片涡流器来控制火焰筒的一次空气流量，并建立强回流区。
The blade-type swirlers have been used in many air engine combustors to control the primary airflow of flame tube and establish a strong recirculation zone.
采用长江科学院空腔回流泥沙淤积水槽试验数据，验证了回流区泥沙淤积计算方法的可行性和精度；
Feasibility and accuracy of the method has been verified by using sedimentation experimental data of cavity flume from the Yangtze River Scientific Research Institute.
本文通过对各种测量冷态流场方法的比较，提出了使用普通探针测定二元火焰稳定器回流区的新方法。
In this paper a brief examination is made of the various techniques available for measurement of cold flow-field in the wake of bluff-body flame stabilizer.
结果表明绕丁坝的近场流动具有强三维非恒定特性，表现在坝后振荡回流区的形成和坝顶表面波的生成。
The observed information shows that the flow is three dimensional and unsteady due to the fluctuating circulation zone and surface wave.
本文研制了脉冲热线空间速度探针及风速测量仪，并测量了轴对称体的尾缘回流区，揭示了流动结构与特征。
A pulsed-wire velocity probe and measurement system is developed in this paper, which is used for measuring separated flows.
计算结果表明，除在冲击缝两侧壁面附近有第一回流区外，在一定流动条件下还可能在下游产生第二回流区。
Except the circulations on the two sides of inlet nearby the inner wall, it is possible to induce two contrary circulations nearby the out wall in down stream. The effects of the currents on iso…
给出了回流区平均速度、最大回流速度及射流作用距离的计算模型，为掘进工作面合理有效通风提供了新的理论依据。
The calculation models are set up on average speed and Max speed in back field and jet effect distance, new theoretical reference is provided for effective ventilation in heading fa.
发现真实结构燃烧室内的回流区不再是轴对称，主燃孔和二次气流的存在使回流区明显被压扁（最扁处的长轴约为短轴的1.6倍）；
The presence of primary hole air flows remarkably squeezes the recirculation zone, resulting in a elliptic-like cross section, with the long axis is longer than the short one up to 1.6 times.
通过计算结果及实验数据的比较可知，本文采用的亚网格尺度模型可以用来模拟模型燃烧室紊流流场及稳定器后面回流区的流动情况。
By the comparison of simulation results and experiment data, the subgrid scale models can simulate the transient turbulent flow and recirculation zone behind the bluff body stabilizer.
本文用双通道热线风速仪对低压下V形火焰稳定器后回流区流动特性进行了实验研究，获得了局部平均速度、素流强度、雷诺应力等参数的分布情况。
By using a constant-temperature-type hot-wire anemometer, the flow characteristics of the recirculating region behind the Vee-gutter flame-holder were investigated experimentally at sub-atmosphere.
利用三维超声学多普勒流速仪对丁坝坝头附近水流和回流区水流的紊动特性进行了系统的观测和分析，得到了丁坝坝头和回流区的水流特性及紊动动能的分布规律。
Then the turbulence characteristics of the spur dike head and backflow region and the distributions law of flow and turbulence kinetic energy around spur dike are obtained in this paper.
由测量结果可知：在双叶片叶轮内，流体基本沿叶片吸力面流动，叶片压力面上的相对速度较低，在压力面出口出现了速度很低的回流区，有明显“射流-尾迹”特征。
The results indicated that in the two-blade impeller, the fluid mainly flowed along the suction side, the velocity is very small on the pressure side, and a typical jet-wake flow has been observed.
当空气失去一定热量时，蒸发器散热片中出来的回流空气是冷空气，这股冷空气接着会被排放到乘客区这股冷空气接着会被释放到乘客区。
As the air loses some of its heat, the air that comes back out of the fins of the evaporator is cool and that cooled air is then vented into the passenger compartment.
当机台上方的热通量越大，其产生的涡漩区范围和回流速度越大。
If the heat flux is large, the vortex region and velocity are large on top of the machine platform.
当机台上方的热通量越大，其产生的涡漩区范围和回流速度越大。
If the heat flux is large, the vortex region and velocity are large on top of the machine platform.
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