基于TDLAS技術(shù)的燃燒場溫度與氣體濃度分布重建研究
發(fā)布時間：2018-08-06 20:09
【摘要】：可調(diào)諧二極管激光吸收光譜技術(shù)可實現(xiàn)對氣體溫度、濃度、流速及壓強等參數(shù)的檢測,該技術(shù)具有靈敏度高,響應速度快,系統(tǒng)簡單,可實現(xiàn)非接觸、無擾動的測量,在燃燒診斷領(lǐng)域具有很大的應用潛力。將該技術(shù)與CT技術(shù)相結(jié)合,可實現(xiàn)燃燒流場溫度和組分濃度的二維分布檢測。本論文基于可調(diào)諧二極管激光吸收光譜技術(shù)分別以燃燒相關(guān)的O_2和H_2O兩種氣體為目標測量氣體,開展了對燃燒過程中溫度和氣體濃度檢測的研究,同時通過數(shù)值模擬和實驗進行了二維分布重建中算法和光束分布研究。主要開展的研究內(nèi)容和創(chuàng)新點有:(1)利用氧氣的兩條吸收譜線,結(jié)合波長調(diào)制理論和溫度反演算法,提出了基于波長調(diào)制技術(shù)對溫度測量的標定方法。在實驗室利用高溫管式爐和兩臺激光器搭建了一套實時溫度測量系統(tǒng),該系統(tǒng)通過分時鋸齒掃描技術(shù),實現(xiàn)了用一套鎖相設(shè)備分別對兩條吸收譜線的諧波信號進行解調(diào)。設(shè)計了動態(tài)溫度測量和穩(wěn)態(tài)溫度測量兩組實驗,分別驗證了溫度測量系統(tǒng)的響應速度,測量精度,以及標定算法的可行性。在300 K到900 K溫度范圍內(nèi),系統(tǒng)的測量誤差在±20 K,其相對精度在±4%以內(nèi),并從實驗系統(tǒng)和影響二次諧波信號的因素等方面詳細分析了實驗的誤差來源。(2)針對不均勻燃燒場溫度測量,提出了一種去除邊界層低溫段對測量結(jié)果影響的修正方法,以獲得對燃燒場中心區(qū)域溫度更高精度的測量;利用開發(fā)的Matlab測溫譜線對的選擇程序,在大量的H_20吸收譜線中選取了 1395.51 nm和1395.69 nm兩條吸收譜線進行了非均勻一維溫度和濃度測量實驗,結(jié)果表明,燃燒場中心區(qū)域的溫度測量精度由修正前的10%提高到3%以內(nèi),測量最大偏差小于30 K,并通過控制空氣流量改變?nèi)紵隣顟B(tài),對其溫度和水氣濃度的實時連續(xù)測量,驗證了該多路徑在線測量系統(tǒng)和修正算法的穩(wěn)定性和可行性。(3)改進了二維分布重建算法,通過數(shù)值模擬對比了改進前后的重建效果,并在實驗中驗證了該算法的可行性。數(shù)值模擬研究了光束分布對重建結(jié)果空間分辨和準確度的影響,提出了光束需分布在與燃燒場對稱軸垂直和平行方向上,才能得到有效利用的方法。同時,為減小安裝的復雜性,設(shè)計了一種雙對射光路結(jié)構(gòu),使得在有限的安裝窗口數(shù)量下,得到更多的光束角度和數(shù)量,該光束分布方式對多數(shù)燃燒場都有較好的適用性。搭建了一套燃燒場溫度和濃度二維分布同時在線重建實驗系統(tǒng),基于該試驗系統(tǒng)重建了不同燃料空氣當量比下溫度和水氣濃度分布變化,其燃燒場峰值溫度與熱電偶測量結(jié)果的相對誤差小于5.6%,而水氣濃度的反演結(jié)果與理論計算結(jié)果的相對誤差在8.6%以內(nèi)。另外,分別重建了由兩個爐面構(gòu)成的不同燃燒場溫度和水氣濃度二維分布情況,結(jié)果表明,當光束方向與燃燒場對稱軸垂直和平行時可得到與實際燃燒場分布相一致的重建效果。
[Abstract]:Tunable diode laser absorption spectroscopy can detect the parameters of gas temperature, concentration, velocity and pressure. This technology has high sensitivity, fast response and simple system. It can realize non-contact and undisturbed measurement. It has great potential in the field of combustion diagnosis. This technology can be combined with CT technology to achieve combustion. Based on the tunable diode laser absorption spectroscopy (tunable diode laser absorption spectroscopy), the measurement of temperature and gas concentration in the combustion process was studied in this paper, based on the tunable diode laser absorption spectroscopy (tunable diode laser absorption spectroscopy), and the two dimensional distribution was carried out through numerical simulation and experiment. The main research contents and innovation points are as follows: (1) using two absorption spectra of oxygen, combining wavelength modulation theory and temperature inversion algorithm, a calibration method for temperature measurement based on wavelength modulation technology is proposed. In the laboratory, a set of high temperature tube furnace and two lasers have been used to build a set of real-time temperature. The system realizes the demodulation of the harmonic signals of two absorption lines by a set of phase-locked equipment through the time-sharing sawtooth scanning technology. The dynamic temperature measurement and steady temperature measurement are designed in two groups. The response speed of the temperature measurement system, the measurement accuracy, and the feasibility of the calibration algorithm are verified, respectively, in 3. In the range of temperature from 00 K to 900 K, the measurement error of the system is within + 20 K, its relative accuracy is within + 4%, and the error sources of the experiment are analyzed in detail from the experimental system and the factors affecting the two harmonic signals. (2) a correction of the effect of the removal of the low temperature of the boundary layer on the measurement results is proposed for the measurement of the temperature of the uneven combustion field. The method is to measure the temperature of the central region of the combustion field to be more accurate. Using the selected program of the developed Matlab spectrum line pair, 1395.51 nm and 1395.69 nm absorption lines are selected in a large number of H_20 absorption lines to measure the inhomogeneous temperature and concentration of one dimensional temperature and concentration. The results show that the temperature of the central region of the combustion field The measurement accuracy is increased from 10% before the correction to less than 3%, the maximum deviation is less than 30 K, and the stability and feasibility of the multi-path on-line measurement system and the correction algorithm are verified by controlling the air flow to change the combustion state and the real-time continuous measurement of its temperature and water gas concentration. (3) the two-dimensional distribution reconstruction algorithm is improved and the number is improved. The value simulation compares the reconstruction effect before and after the improvement, and verifies the feasibility of the algorithm in the experiment. The numerical simulation studies the effect of the beam distribution on the spatial resolution and accuracy of the reconstruction results. The method is proposed that the beam need to be effectively used in the vertical and parallel direction of the beam to the combustion field. With the complexity of the installation, a two pair beam structure is designed to obtain more angle and quantity of light beam under the limited number of installation windows. The beam distribution mode has good applicability to most of the combustion fields. A set of experimental system for simultaneous on-line reconstruction of the temperature and concentration of the combustion field is set up, based on the experimental system. The variation of temperature and gas concentration distribution under different fuel air equivalent ratio is rebuilt. The relative error of the peak temperature of the combustion field and the results of the thermocouple is less than 5.6%, and the relative error between the inversion results of the gas concentration and the theoretical calculation is less than 8.6%. In addition, the different combustion field temperatures made up of two furnace surfaces are rebuilt respectively. The results show that the reconstruction effect consistent with the actual combustion field distribution can be obtained when the beam direction is perpendicular to the symmetry axis of the combustion field and parallel to the combustion field.
【學位授予單位】：中國科學技術(shù)大學
【學位級別】：博士
【學位授予年份】：2017
【分類號】：O643.21;O657.3
本文編號：2168857
[Abstract]:Tunable diode laser absorption spectroscopy can detect the parameters of gas temperature, concentration, velocity and pressure. This technology has high sensitivity, fast response and simple system. It can realize non-contact and undisturbed measurement. It has great potential in the field of combustion diagnosis. This technology can be combined with CT technology to achieve combustion. Based on the tunable diode laser absorption spectroscopy (tunable diode laser absorption spectroscopy), the measurement of temperature and gas concentration in the combustion process was studied in this paper, based on the tunable diode laser absorption spectroscopy (tunable diode laser absorption spectroscopy), and the two dimensional distribution was carried out through numerical simulation and experiment. The main research contents and innovation points are as follows: (1) using two absorption spectra of oxygen, combining wavelength modulation theory and temperature inversion algorithm, a calibration method for temperature measurement based on wavelength modulation technology is proposed. In the laboratory, a set of high temperature tube furnace and two lasers have been used to build a set of real-time temperature. The system realizes the demodulation of the harmonic signals of two absorption lines by a set of phase-locked equipment through the time-sharing sawtooth scanning technology. The dynamic temperature measurement and steady temperature measurement are designed in two groups. The response speed of the temperature measurement system, the measurement accuracy, and the feasibility of the calibration algorithm are verified, respectively, in 3. In the range of temperature from 00 K to 900 K, the measurement error of the system is within + 20 K, its relative accuracy is within + 4%, and the error sources of the experiment are analyzed in detail from the experimental system and the factors affecting the two harmonic signals. (2) a correction of the effect of the removal of the low temperature of the boundary layer on the measurement results is proposed for the measurement of the temperature of the uneven combustion field. The method is to measure the temperature of the central region of the combustion field to be more accurate. Using the selected program of the developed Matlab spectrum line pair, 1395.51 nm and 1395.69 nm absorption lines are selected in a large number of H_20 absorption lines to measure the inhomogeneous temperature and concentration of one dimensional temperature and concentration. The results show that the temperature of the central region of the combustion field The measurement accuracy is increased from 10% before the correction to less than 3%, the maximum deviation is less than 30 K, and the stability and feasibility of the multi-path on-line measurement system and the correction algorithm are verified by controlling the air flow to change the combustion state and the real-time continuous measurement of its temperature and water gas concentration. (3) the two-dimensional distribution reconstruction algorithm is improved and the number is improved. The value simulation compares the reconstruction effect before and after the improvement, and verifies the feasibility of the algorithm in the experiment. The numerical simulation studies the effect of the beam distribution on the spatial resolution and accuracy of the reconstruction results. The method is proposed that the beam need to be effectively used in the vertical and parallel direction of the beam to the combustion field. With the complexity of the installation, a two pair beam structure is designed to obtain more angle and quantity of light beam under the limited number of installation windows. The beam distribution mode has good applicability to most of the combustion fields. A set of experimental system for simultaneous on-line reconstruction of the temperature and concentration of the combustion field is set up, based on the experimental system. The variation of temperature and gas concentration distribution under different fuel air equivalent ratio is rebuilt. The relative error of the peak temperature of the combustion field and the results of the thermocouple is less than 5.6%, and the relative error between the inversion results of the gas concentration and the theoretical calculation is less than 8.6%. In addition, the different combustion field temperatures made up of two furnace surfaces are rebuilt respectively. The results show that the reconstruction effect consistent with the actual combustion field distribution can be obtained when the beam direction is perpendicular to the symmetry axis of the combustion field and parallel to the combustion field.
【學位授予單位】：中國科學技術(shù)大學
【學位級別】：博士
【學位授予年份】：2017
【分類號】：O643.21;O657.3
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