用于燃气涡轮机高温测量的光纤高温计

涡敢温度测量具有环境恶劣、污染严重等不利。高速燃气不但会给测量引入额外的速度误差,而且在高温形成的强温度场作用下,光纤自身热会极大地影响高温计的分辨率和精确度。针对涡轮前燃气测温的特殊条件,讨论了黑体式蓝宝石光纤高温计的几个关键技术,并分析和实验了双光纤补偿法克服强温度场影响的效果。     

一种新型高速旋转叶片振动测量传感器的研究

高速旋转叶片振动实时检测技术是航空工业亟待解决的难题,传统的接触式测量方法如电阻应变片法,已不能满足测振系统对高转速、实时、全面监测的要求,并且很难做到监测所有叶片振动.为提高旋转叶片振动测量系统的性能,国外一直在发展非接触式旋转叶片测振技术.本文设计了一种新型的基于叶尖定时原理和光纤传感的、旋转叶片测振用的光纤传感器(叶尖定时传感器),满足了旋转叶片振动监测系统对叶片振动信号拾取的要求.     

解透平机械流场的有限单元方法_等参单元法

本文介绍了求解涡轮机械流场的有限元法,在简化为轴对称流动的假设下,基于周向平均流面,应用流函数把涡轮机内的流动简化为二元准调和方程的描述,利用伽略金法求解各个基本方程,得到流场解。     

无火焰燃烧可减少氮氧化物排放

阿拉伯联合酋长国阿布扎比的石油研究所进行了一次无火焰氧化试验（FLOX）,受到世人瞩目。研究人员认为,FLOX工艺有可能防止气体涡轮机主要污染物之一的氮氧化物（NOx）排放。     

明导推出MicReD工业化的1500A功率循环测试设备

正Mentor Graphics公司近日宣布推出全新MicReD Industrial Power Tester 1500A(工业化的1500A功率循环测试设备)。该1500A功率循环测试设备既可以对包括混合动力汽车及电动汽车和列车在内的汽车和交通行业应用中越来越多的电力电子器件进行可靠性测试,还可以对发电与变频器、风力涡轮机等可再生能源应用中越来越多的电力电子器件进行可靠性测试。它是市面上唯一结合了功率循环测试功能和瞬态热测试功能的热测试产品,它通过结构函数提供实时故障原因诊断的数     

《热能动力工程》投稿须知

正《热能动力工程》是学术性与技术性相结合的国家核心期刊,被国际著名检索系统收录,曾获2003年第二届国家期刊奖百种重点期刊和2005年黑龙江省优秀期刊奖。报道内容:陆用/船用燃气轮机、汽轮机、锅炉等热能动力领域科研成果和传动元件技术、新能源等实用性强且具有推广价值的先进技术经验等。栏目设置:专题综述、热力涡轮机械、热力循环、热力工程、新能源动力技术和环保技术。1投稿要求和注意事项1.1本刊接受电子稿件(一般不接受纸稿),投稿邮箱:rndlgch703@163.com,联系电话:0451-55654932;请勿一稿多投,否则将追究相应责任。1.2稿件应未公开发表过,并遵守国家保密规定和《著作权法》有关规定。如发生侵权或泄密问题由作者承担。1.3来稿应具有创新性、科学性和实用性,要求逻辑严谨、重点明确、论据充分、数据可靠、图表清晰、文字简练;综述性论文6000字左右、研究性论文以5000字以内;实用性论文4000字以内。     

太阳风涡轮机产生两种可再生能源

在可以产生两种可再生能源时,为什么只满足于一种呢?这也正是英国利物浦大学的科学家所想的问题,并且他们将自己的思考付诸实践。由Joe King博士带领的这个研究小组针对风力涡轮机只有在刮风的时候才有用的批评,提出了创新的解决方案。他们通过加上一套新的旋转太阳能叶片,使普通的风力涡轮机换代升级,发挥更大的效能。传统涡轮机和光电技术的有机结合,使它的功能翻了一番。     

微型燃气轮机涡轮背盘冲击冷却特性研究

受可靠性和成本制约,微型燃气轮机冷却技术的发展和应用一直较为缓慢,已成为其进一步提升热效率的主要瓶颈。针对此问题,提出了一种简单可靠的径流涡轮新型冷却技术-背盘冲击冷却,使用气热耦合的方法对该冷却技术的冷却特性进行了仿真研究。结果表明:背盘冲击冷却可以大幅降低径流涡轮背盘的温度。当冷却气体流量为主流的2%时,冷却流体温度从473.0降到323.0 K,背盘平均温度降低了143.0～202.0 K;当冷却温度为323.0 K时,冷却气体消耗量从主流质量流量的1%增加到4%时,背盘平均温度降低150.0～252.0 K。冷却流体流入主流后会对其产生一定的影响,每增加1%的冷却流量,涡轮机效率下降约1%。     

Feasibility of pulse combustion in micro gas turbines

In gas turbines, a fast decrease of efficiency appears when the output decreases; the efficiency of a large gas turbine (20…30 MW) is in the order of 40 %, the efficiency of a 30 kW gas turbine with a recuperator is in the order of 25 %, but the efficiency of a very small gas turbine (2…6 kW) in the order of 4…6 % (or 8…12 % with an optimal recuperator). This is mainly a result of the efficiency decrease in kinetic compressors, due to the Reynolds number effect. Losses in decelerating flow in a flow passage are sensitive to the Reynolds number effects. In contrary to the compression, the efficiency of expansion in turbines is not so sensitive to the Reynolds number; very small turbines are made with rather good efficiency because the flow acceleration stabilizes the boundary layer. This study presents a system where the kinetic compressor of a gas turbine is replaced with a pulse combustor. The combustor is filled with a combustible gas mixture, ignited, and the generated high pressure gas is expanded in the turbine. The process is repeated frequently, thus producing a pulsating flow to the turbine; or almost a uniform flow, if several parallel combustors are used and triggered alternately in a proper way. Almost all the compression work is made by the temperature increase from the combustion. This gas turbine type is investigated theoretically and its combustor also experimentally with the conclusion that in a 2 kW power size, the pulse flow gas turbine is not as attractive as expected due to the big size and weight of parallel combustors and due to the efficiency being in the order of 8 % to 10 %. However, in special applications having a very low power demand, below 1000 W, this solution has better properties when compared to the conventional gas turbine and it could be worth of a more detailed investigation.     

Connecting Wind Turbine Generator to Distribution Power Grid--A Preload Flow Calculation Stage

A distribution grid is generally characterized by a high R/X （resistance/reactance） ratio and it is radial in nature. By design, a distribution grid system is not an active network, and it is normally designed in such a way that power flows from transmission system via distribution system to consumers. But in a situation when wind turbines are connected to the distribution grid, the power source will change from one source to two sources, in this case, network is said to be active. This may probably have an impact on the distribution grid to whenever the wind turbine is connected. The best way to know the impact of wind turbine on the distribution grid in question is by carrying out load flow analysis on that system with and without the connection of wind turbines. Two major fundamental calculations： the steady-state voltage variation at the PCC （point of common coupling） and the calculation of short-circuit power of the grid system at the POC （point of connection） are necessary before carrying out the load flow study on the distribution grid. This paper, therefore, considers these pre-load flow calculations that are necessary before carrying out load flow study on the test distribution grid. These calculations are carded out on a test distribution system.