压缩机

Such as eliminating air-current pulsation in the design of main engine, setting up buffer, setting up acoustic filters , avoiding the air-current and piping vibration etc., These methods, not only in the times of designing pipeline, but also when the compressor cannotbeen adjusted greatly but working unsafely, are of momentous guiding significance.

这些措施和方法，不仅在配管的设计阶段中，而且在压缩机工作时，安全运转受到威胁而不能作大的调整时，都具有重要的指导意义。

Flow simulation and performance analysis are conducted for the stage of a high energy head unshrouded centrifugal compressor with vaneless and tandem diffuser respectively using CFD software. The flow field distribution and performance comparison are offered in the two conditions.

使用 CFD 软件对某高能头半开式离心压缩机的级，在分别采用无叶扩压器和串列扩压器时进行了流动模拟和性能分析，给出了两种情况下的流场分布和性能比较。

The numerical results show that:(1) the throughflow wake is considerably influenced by the tip clearance. The low-kinetic-energy fluid accumulated in the shroud/pressure side of the unshrouded impeller, but in the shroud/suction region for 0.0 tip clearance;(2) there possibly exists an optimum size of the tip-clearance which is not the zero tip clearance to make the flow loss minimized.

研究结果表明，(1)NASA低速大尺度离心压缩机半开式叶轮的低速尾迹区在压力面与轮盖的角区，而相应的闭式叶轮的低速尾迹区聚集在轮盖的中心位置；(2)数值实验表明，叶顶间隙并非越小越好，可能存在一个最优间隙，使得叶轮流动损失最小。

In the present study, the experimental and numerical investigation is carried out at an outward volute of circular cross section cooperating with a centrifugal impeller and a vaned diffuser.

本文对一个包含叶轮、有叶扩压器和蜗壳的单级离心压缩机进行了实验和数值研究。

A turbocharger is a dynamic compressor, in which air or gas is compressed by the mechanical action of impellers, vaned rotors which are spun using the kinetic movement of air, imparting velocity and pressure to the flowing medium.

蒸气增压器是一台动态压缩机，在哪空气或气体由叶轮的机械行动压缩，使用空气的运动运动转动的vaned电动子，给予速度和压力到流动的媒介。

On the basis of three dimensional viscous numerical simulation on the internal flow field in the vaned diffuser of a centrifugal compressor,the influence of shaper parameters on the pneumatic performance in low solidity vaned diffuser is compared.

通过对一离心压缩机叶片扩压器内部流场进行三维粘性数值模拟，对比分析了小稠度扩压器的主要形状参数对气动性能的影响。

Moreover, the internal flows of impeller, vaneless diffuser, bend and other parts of the stage are obtained by calculation, and the numerical results are discussed in details.

同时对计算结果进行了详细的分析。计算表明，本文所采用的紊流模型和数值方法能较好的预测离心压缩机各部件内部的流动。

The emphasis of this paper is attached on the aerodynamic performance of the stationary components such as vaneless diffusers and crossovers and their influence on the total aerodynamic performance of the whole machine.

研究结果表明，多级离心压缩机的性能不仅决定于各级动叶本身的气动性能，而且受级间静止部件的气动性能影响较大。

Vaneless diffuser rotating stall in centrifugal compressor limits its operation range.

无叶扩压器的旋转失速限制了离心压缩机的运行范围。

A new method of a centrifugal compressor with a hub airfoil-vane diffuser was proposed and applied based on the investigation of a centrifugal compressor with vaneless diffuser.

0前言扩压器是离心式压缩机一个级的重要组成元件之一，主要分为有叶扩压器和无叶扩压器两种。

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。