CAJ | 학술논문

文章提出了一种新型单束激光-连续超声波空气流动速度测量方法.该方法利用连续超声波在运动空气流场中传播时,超声波传播速度音速与空气运动速度叠加的物理现象,采用激光-超声干涉原理,通过测量波长变化,实现对空气流动速度的测量.建立了试验验证系统,通过测量静止流场中的音速与均匀流场的速度,验证了该方法原理的正确性和技术可行性.该方法对流动现象不产生任何干扰与改变;不存在流动速度方向判别以及信号失真、丢失与辨别等复杂测量技术问题; 可直接测量流场中任意一点瞬时速度;具有测量精度高、数据处理简单、成本小、造价低、操作简便等优点;易于实现"阵排列激光-超声测量技术",有望进行多个截面的速度测量以及非定常流场测量,适用于研究集中涡、二次涡、不规则分离等多种复杂流动现象.
문장제출료일충신형단속격광-련속초성파공기류동속도측량방법.해방법이용련속초성파재운동공기류장중전파시,초성파전파속도음속여공기운동속도첩가적물리현상,채용격광-초성간섭원리,통과측량파장변화,실현대공기류동속도적측량.건립료시험험증계통,통과측량정지류장중적음속여균균류장적속도,험증료해방법원리적정학성화기술가행성.해방법대류동현상불산생임하간우여개변;불존재류동속도방향판별이급신호실진、주실여변별등복잡측량기술문제; 가직접측량류장중임의일점순시속도;구유측량정도고、수거처리간단、성본소、조개저、조작간편등우점;역우실현"진배렬격광-초성측량기술",유망진행다개절면적속도측량이급비정상류장측량,괄용우연구집중와、이차와、불규칙분리등다충복잡류동현상.
Aim. R. H. Engler is the first author of both Ref.1 and Ref.2. In Ref.2, Engler points out that his own double beam method is deficient in measuring accuracy. We propose a single beam method that is, we believe, better in measuring accuracy than his. Subsection 1.1 of the full paper briefs the measuring principles of optic acoustical interference. Subsection 1.2 briefs the principles of our new single beam laser ontinuous ultrasonic wave method for air velocity measurement. Section 2 describes that we have set up an experimental system to prove this method through measuring the acoustical velocity in still air and that in airflow field. Section 3 presents some experimental results in Figs. 5 and 6 and Table 1; the analysis of these results shows preliminarily that our single beam method is accurate and feasible technically. The advantages of this method are as follows: (1) an instantaneous velocity at any point in the flow field can be measured directly with high precision; (2) it is simple to operate with low cost and data processing can be done expediently; (3) it is easy to implement an array of laser ultrasonic measurements so as to obtain velocity distributions of multi planes inside a flow field; it is suitable for investigating unsteady flow and complex flow like concentrated vortex, secondary vortex and irregular separation.