专业英语演讲(热能及暖通专业用)

1、Fan（风机）制作者：演讲者：Fan: It is a kind of machine used to compress and transport gas. From the energy point of view, it is a machine which change the prime motor mechanical energy into the gas energy.风机：是一种用于压缩和运输气体的机械，从能量的观点来看，它是把原动机的机械能转变为气体能量的一种机械。According to the total pressure 按产生全压大小ventilator通风机 p3

2、40kPaClassification:Classification:分类分类vane叶片式Positive displacement容积式According to the working principle按工作原理分类 centrifugal离心式Axial flow轴流式reciprocating往复式rotary回转式Jaeger blower叶氏风机Roots blower罗茨风机Screw fan螺杆风机 The gas enters the fan near the center of the impeller,where it is caught by the impeller

3、s vanes.These impart a velocity to the gas and centrifugal force carries it to the wall of the fan,where it exits.气体从叶轮的中心附近进入风机，由叶轮叶片转动。这些叶气体从叶轮的中心附近进入风机，由叶轮叶片转动。这些叶片给气体一个速度，由离心力将气体带至风机内壁然后排出片给气体一个速度，由离心力将气体带至风机内壁然后排出The principle of Centrifugal fan：（一）（一）Centrifugal fanImpeller叶轮叶轮The impeller is

4、the main component of the fan, which is composed of a shroud, hub disk, disc, blade and hub.叶轮是风机的主要部件，由前盘、后盘、中盘、叶片及轮毂组成。Impeller have Impeller have three three kinds:forward-kinds:forward-bent,radial and bent,radial and backward curced.backward curced.叶片有三种类型：前弯式、径向式和后弯式。When290,it called forward-b

5、ent blade;when2=90,it called radial impeller;when2=90,it called backward curced vane.当290时，称为前弯式叶片；当2=90时，称为径向式叶片；当290时，称为后弯式叶片。Bar直板型直板型Bending弯板型弯板型Wing机翼型机翼型qv-Hqv-H性能曲线性能曲线qvqvP00（qv-qv-）（qv-Pqv-P）Centrifugal fanAnother kinds of fan：Reciprocating blower往复式风机Roots blower罗茨风机罗茨风机Screw fan螺杆风机螺杆风机J