电阻膜片喷涂加工雾化射流场PIV测量及工艺试验研究
本文选题：电阻膜片 + 气泡雾化 ； 参考：《哈尔滨工业大学》2017年硕士论文
【摘要】：精密碳膜电位计作为一种位移传感器,由于其高稳定性和高精度的特点,被广泛应用于航空航天领域的位置反馈系统中。电阻膜片作为精密碳膜电位计中关键组成部分,其加工质量体现在电阻值、线性度和耐磨性上,会直接影响位置反馈系统的控制精度和使用寿命。制造精密碳膜电位计的过程中,采用雾化射流喷涂工艺加工电阻膜片,电阻液喷涂的雾化质量会对电阻膜片的加工质量有至关重要的影响。本课题首先在精密碳膜电位计喷涂装置的基础上,分析了电阻膜片雾化射流喷涂加工的原理,对气泡雾化喷嘴的雾化特性进行了系统的研究。气泡雾化喷嘴是一种新型雾化喷嘴,具有一些其他传统类型雾化喷嘴不具有的优点,如雾化质量受喷嘴口内径影响小、雾化质量高、耗气量小。为将气泡雾化喷嘴的优点更好地应用于电阻液雾化,进行了电阻液气泡雾化射流的数值模拟,通过仿真结果得到雾化气压条件对液滴速度等雾化质量的影响。然后设计搭建了电阻液气泡雾化射流PIV(Particle Image Velocimetry)速度测量实验台,利用条件参数可调的雾化设备,采用先进的PIV仪器,配合开发的PIV图像处理软件,搭建了不受外界干扰的实验环境,实现了对电阻液气泡雾化射流场的测量。采用多重网格迭代互相关算法,通过Matlab软件编写了PIV图像处理程序,完成了对电阻液气泡雾化射流场图像的分析处理,得到了流场的瞬态速度分布,实验结果令人满意。最后基于精密碳膜电位计喷涂装置进行了某型号电阻膜片的喷涂工艺试验,在不同电阻液气泡雾化射流场中进行加工,得到不同雾化特性对电阻膜片的电阻值以及线性度的影响,寻求较优的工艺参数组合满足目标型号的电阻值和线性度的要求。
[Abstract]:As a displacement sensor, precision carbon film potentiometer is widely used in position feedback system in aerospace field because of its high stability and high accuracy. As a key component of the precision carbon film potentiometer, the resistance film is characterized by its resistance, linearity and wear resistance, which will directly affect the control accuracy and service life of the position feedback system. In the process of making the precision carbon film potentiometer, the atomization quality of the resistive liquid spray will have an important effect on the processing quality of the resistance film. Firstly, based on the precision carbon film potentiometer spraying device, the principle of resistance film spray jet spraying is analyzed, and the atomization characteristics of bubble atomizing nozzle are studied systematically. Bubble atomizing nozzle is a new type of atomizing nozzle, which has some advantages that other traditional atomization nozzles do not have. For example, the atomization quality is little affected by the nozzle inner diameter, the atomization quality is high, and the gas consumption is small. In order to apply the advantages of bubble atomizing nozzle to the atomization of resistive liquid, the numerical simulation of the atomizing jet with resistive liquid was carried out. The influence of atomization pressure on the droplet velocity and other atomization quality was obtained by the simulation results. Then, a PIV (Particle Image velocimetry) velocity measuring system is designed and built. The PIV image processing software is developed with advanced PIV instrument and the atomizing equipment with adjustable conditional parameters. An experimental environment without external interference was set up to measure the atomized jet field of resistance liquid bubble. A PIV image processing program is developed by using the iterative cross-correlation algorithm of multi-grid and Matlab software. The image analysis of resistive liquid bubble atomization jet field is completed, and the transient velocity distribution of the flow field is obtained. The experimental results are satisfactory. Finally, based on the precision carbon film potentiometer spraying device, the spraying process of a certain type of resistive film was tested and processed in different resistance liquid bubble atomization jet field. The influence of different atomization characteristics on resistance value and linearity of resistance film is obtained, and the optimum combination of process parameters is found to meet the requirements of resistance value and linearity of the target model.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP212
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