【作者】 杨卫红；

【导师】 唐霞辉；

【作者基本信息】 华中科技大学 ， 物理电子学， 2007， 硕士

【摘要】 本文旨在研究新型横流5kW CO₂激光器气体流动和热交换系统,利用通风机原理设计并计算了激光器风机结构参数,根据气体传热学原理分析计算热交换器换热能力。对气体流动与热传导的关键技术问题进行了深入研究。（1）设计了横流5kW CO₂激光器通风机参数,包括叶片的尺寸与叶型、叶轮进口直径、叶轮出口直径、叶片进出口宽度、进出口叶片角、叶片数、蜗壳宽度及蜗壳内壁型线等。实验测试表明,放电区内气压变化平稳,气体流速平均在63m/s,放电区风速均匀。（2）分析了激光器内部循环热交换过程,建立了以圆形翅片管束组成的热交换器的热平衡方程,进行了具体的换热计算。理论分析表明,热交换器中翅片管束结构合理,性能稳定;实验结果显示,放电区平均温度保持在25℃,低温水温度变化幅度平缓,能够稳定在11℃,换热能力满足工作气体的换热要求。（3）本文创新性地采用轻质材料替代钢质材料用于风机叶轮制作,减轻了风机的重量,降低了噪音;激光器的设计中采用单放电盒、单组风机取代双放电盒、双风机,实现高功率CO₂激光输出,缩小了激光器的体积。通过5kW横流CO₂激光器气体流动系统与热交换系统的理论与实验研究,获得了具有实用价值的风机及热交换器的结构参数,总结了气体流动规律,对开发新型横流激光器具有一定的理论意义及实用价值。更多还原

【Abstract】 The thesis aims to study the gas dynamics and heat exchange system of the new 5kW transverse flow CO₂ laser. Structural parameters of the blower for the laser were designed and calculated based on impeller theory. The capability of the heat exchanger was analyzed and calculated according to gas heat transfer theory. The key technology of gas flow and heat transfer had been deeply researched. The main achievements are as follows.（1） First, structural parameters including the size and the shape of vane of the blower for Transverse flow 5kW CO₂ laser were designed, including the inlet and outlet diameter of impeller, the inlet and outlet angle of vane, the numbers of vane, the width and shape of worm wheel, etc. The research results showed that average gas flow rate was at 63m/s and wind speed in discharge zone was uniform with a calm change of air pressure.（2） The internal circulation of the laser heat exchange process was analyzed. Heat equilibrium equations for calculating the heat exchange had been also established. Theoretical analysis showed that the structure of the heat exchanger was correct and stable performance was achieved. Experimental results showed that average temperature in the discharge zone was at 25℃, temperature change was stable at 11℃in low temperature water, and the heat exchange capacity met the heat exchange requirement of work gas.（3） In this thesis, it is innovative that the light alloy materials was used for making an impeller instead of heavy steel materials, thereby the weight and noise of the blower was decreased. At the same time, the double discharge boxs and double-blower were replaced with single discharge box and single-bower, finally a new type of high-power transverse flow CO₂ laser with smaller size and low cost will be developed.更多还原