轴流式风机性能曲线概要.docVIP

轴流式风机的性能 摘 要 轴流式风机在火力发电厂及当今社会中得到了非常广泛的运用。本文介绍了轴流式风机的工作原理、叶轮理论、结构型式、性能参数、性能曲线的测量、运行工况的确定及调节方面的知识,并通过实验结果分析了轴流式风机工作的特点及调节方法。 关键词：轴流式风机、性能、工况调节、测试报告 目 录 1绪论 1.1风机的概述·····························································4 1.2风机的分类·····························································4 1.3轴流式风机的工作原理···················································4 2轴流式风机的叶轮理论 2.1概述··································································4 2.2轴流式风机的叶轮理论··················································4 2.3?速度三角形····························································5 2.4能量方程式·····························································6 3轴流式风机的构造 3.1轴流式风机的基本形式···················································6 3.2轴流式风机的构造·······················································7 4轴流式风机的性能曲线 4.1风机的性能能参数·······················································8 4.2性能曲线······························································10 5轴流式风机的运行工况及调节 5.1轴流式风机的运行工况及确定············································11 5.2轴流式风机的非稳定运行工况············································11 5.2.1叶栅的旋转脱流·······················································12 5.2.2风机的喘振···························································12 5.2.3风机并联工作的“抢风”现象·············································13 5.3轴流式风机的运行工况调节··············································14 5.3.1风机入口节流调节·····················································14 5.3.2风机出口节流调节·····················································14 5.3.3入口静叶调节·························································14 5.3.4动叶调节·····························································15 5.3.5变速调节·····························································15 6轴流风机性能测试实验报告 6.1实验目的······························································15 6.2实验装置与实验原理····················································15 6.2.1用比托静压管测定质量流量 6.2.2风机进口压力 6.2.3风机出口压力 6.2.4风机压力 6.2.5容积流量计算 6.2.6风机空气功率的计算 6.2.7风机效率的计算 6.3数据处理·····························