發(fā)布時間：2018-05-24 07:07

  本文選題：紋影技術(shù) + 流場��； 參考：《西安工業(yè)大學》2017年碩士論文

【摘要】：本文首先對傳統(tǒng)紋影技術(shù)的基本原理和方法進行了闡述,其次介紹了該技術(shù)在流體邊界層、激波、可燃氣體內(nèi)的對流混合以及風洞和水洞的觀測試驗等領(lǐng)域的相關(guān)應用,并分析了現(xiàn)有不同類型的紋影技術(shù)的優(yōu)缺點。為了解決紋影定量測量方法不完善的問題,提出了一種紋影密度定量計算的新方法,其研究工作的主要內(nèi)容如下:1.設計了一套紋影密度測量實驗裝置,該裝置主要由透射式紋影光路、刀口控制電路和流場密度定量分析軟件共三大部分組成。2.研究了紋影刀口自動尋焦算法、密度定量測量算法以及紋影圖像的標定曲線技術(shù)。刀口自動尋焦算法以分析尋焦過程中的圖像特征為基礎,通過圖像灰度均勻性比較的方法,將紋影刀口裝置的位置自動尋于第二紋影鏡焦點位置;密度定量分析算法以紋影儀定量測量原理以基礎,通過分析圖像灰度大小與未被遮擋的光源像面積的關(guān)系,計算得出流場的密度值。3.搭建以矩形電控加熱平臺上方受熱空氣為試驗對象的實驗裝置,并且結(jié)合所提出的刀口自動尋焦算法、標定曲線技術(shù)以及密度定量測量算法三大核心內(nèi)容,進行了流場密度測量試驗,并將測量結(jié)果與標準器件測量的密度信息進行比較。實驗結(jié)果表明:在室溫20攝氏度下,尋焦算法的精度在0.3～0.5mm之間,流場密度測量相對誤差小于5%。實現(xiàn)了電控加熱平臺上方受熱空氣的密度測量,實驗結(jié)果較為理想,其研究內(nèi)容為實際應用和流體密度試驗的觀測提供了一種新思路。
[Abstract]:In this paper, the basic principles and methods of traditional schlieren technique are introduced, and its applications in fluid boundary layer, shock wave, convection mixing in combustible gas, wind tunnel and water tunnel observation are introduced. The advantages and disadvantages of different types of schlieren techniques are also analyzed. In order to solve the problem of imperfection of the quantitative measurement method of schlieren, a new method for quantitative calculation of speckle density is proposed. The main contents of its research work are as follows: 1: 1. A set of experimental device for measuring the density of schlieren is designed. The device is mainly composed of three parts, I. e., transmission schlieren path, knife edge control circuit and quantitative analysis software of flow field density. The automatic focusing algorithm, the density quantitative measurement algorithm and the calibration curve technology of the speckle image are studied. Based on the analysis of image features in the process of focusing, the position of the cutting edge is automatically located in the focus position of the second speculum by comparing the grayscale uniformity of the image. The density quantitative analysis algorithm is based on the principle of quantitative measurement with a grain shaper. By analyzing the relationship between the image gray scale and the image area of the unoccluded light source, the density value of the flow field is calculated. 3. Taking the heated air above the rectangular electric control heating platform as the experimental object, and combining the proposed automatic focusing algorithm of the knife edge, calibration curve technology and density quantitative measurement algorithm three core contents. The flow field density measurement experiment was carried out, and the measured results were compared with the density information measured by standard devices. The experimental results show that the accuracy of the focusing algorithm is between 0.3~0.5mm and the relative error of flow field density measurement is less than 5 at room temperature of 20 degrees Celsius. The density measurement of heated air above the electrically controlled heating platform is realized, and the experimental results are satisfactory. The research content provides a new way for practical application and observation of fluid density test.
【學位授予單位】：西安工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TH74;TP391.41

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本文編號：1928154