离心式循环压缩机的故障修复

介绍了离心式循环压缩机中间接简轴承座损坏镶套环修复的方法及检修关键技术参数。     

压气机叶轮强度三维有限元计算分析

本文用三维有限元计算方法对某增压器压气机叶轮进行强度分析,计算了叶轮的应力和变形,并提出了提高叶轮结构强度的方法．     

Numerical study of effect of compressor swirling flow on combustor design in a MTE

An effect of the swirling flow on the combustion performance is studied by the computational fluid dynamics(CFD) in a micro-gas turbine with a centrifugal compressor, dump diffuser and forward-flow combustor. The distributions of air mass and the Temperature Pattern Factor(as: Overall Temperature Distribution Factor-OTDF) in outlet are investigated with two different swirling angles of compressed air as 0° and 15° in three combustors. The results show that the influences of swirling flow on the air distribution and OTDF cannot be neglected. Compared with no-swirling flow, the air through outer liner is more, and the air through the inner liner is less, and the pressure loss is bigger under the swirling condition in the same combustor. The Temperature Pattern Factor changes under the different swirling conditions.     

Scroll compressor modelling for heat pumps using hydrocarbons as refrigerants

Hydrocarbons are today considered as promising alternatives to hydrofluorocarbons thanks to their low environmental impact and their easy implementation. However, some precautions have to be taken to thwart their flammability. European regulations impose to take stringent measures regarding components and to install heat pumps in unoccupied spaces. Nevertheless manufacturers keep working on components for hydrocarbons. In the frame of a research project on heat pumps for simultaneous heating and cooling, an R407C prototype working with a scroll compressor was built and tested. A near-industrial prototype is today being designed for propane with the help of recent modelling techniques. After having detailed the main issues regarding hydrocarbons as refrigerants, this article reviews scroll compressor modelling studies and presents the development of a thermodynamically realistic scroll compressor model. It was first developed for R407C and then adapted to thermodynamic properties of hydrocarbons and to other sizes of compressors.     

Application of fullerene C60 nano-oil for performance enhancement of domestic refrigerator compressors

In this work, the fullerene C₆₀ nano-oil is proposed as a promising lubricant to enhance the performance of domestic refrigerator compressors. The stability of fullerene C₆₀ nanoparticles dispersed in a mineral oil and the lubrication properties of the nano-oil were investigated experimentally. It was confirmed that the nanoparticles steadily suspend in the mineral oil at stationary conditions for a long period of time. The friction coefficients of the nano-oil significantly decrease with increasing the concentration of nanoparticles in the mineral oil, especially at the lower applied loads. The friction coefficients of the nano-oil with the concentration of 1–3 g L⁻¹ are 12.9–19.6% lower than that of pure mineral oil. The applications of the nano-oil with the specific concentration of 3 g L⁻¹ to two domestic refrigerator compressors were examined by compressor calorimeter experiments. The results shows the COPs of two compressors were improved by 5.6% and 5.3%, respectively, when the nano-oil was used instead of pure mineral oil.     

乘累加运算器的高性能解决方案

在设计数字信号处理器时我们经常要设计高性能的乘累加运算器，文章详细分析了乘累加运算器的结构，提出了其高性能设计方案并采用标准单元进行了实现，同时提出了DCT运算单元的高性能解决方案。     

STUDY ON THERMODYNAMIC MODEL OF A COMPRESSOR WITH ARTIFICIAL NEURAL NETWORKS

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多台透平压缩机组分布式实时监测和集中式故障诊断仪器系统

本文提出了一种大型电力、石化企业多机组基于计算机网络和分布式多级计算机系统概念的分布式实时监测与集中故障诊断仪器系统的原理，并着重讨论了仪器系统对透平压缩机组三种典型工作状态的监测原理，给出了系统实时运行结果。该仪器系统具有在线、实时、数据冻结全面、数据谱分析和诊断功能、置信度高、运行可靠等优点，整个机组振动及工艺参数（温度、压力、流量等）的同时刻监测记录，保证了监测结果和诊断结果的正确。     

活塞式压缩机设计计算软件的研究与开发

本文介绍了采用计算机面向对象技术．编制可用于各种气体的由单缸至多缸、各种不同尺寸、不同类型活塞式压缩机的热力、动力以及典型机件强度等计算的设计计算软件。软件对增强活塞式压缩机的生产能力．提高机械效率。节约电耗．促进安全生产．有着实际的经济与社会意义。     

基于虚拟正交试验的压气机叶轮轴-毂径向微动特性研究(英文)

采用Pro/E建立压气机叶轮轴-毂三维模型,利用ANSYS软件采用子结构结合网格随移技术的分析方法,建立其有限元模型;采用虚拟正交试验方法对压气机叶轮轴-毂进行仿真,得出过盈量、摩擦系数、转速对最大单位摩擦功和平均摩擦功影响显著性次序及影响规律,从而得到最优组合。