【摘要】：隨著人們生活水平的提高,對(duì)室內(nèi)舒適度要求也越來(lái)越高,尤其是冬季供暖房間。實(shí)際建筑中供暖末段熱表面附近氣流場(chǎng)會(huì)影響室內(nèi)熱環(huán)境以及人員舒適度。由于流場(chǎng)自身的復(fù)雜性、測(cè)量技術(shù)手段上的局限性,關(guān)于熱表面附近氣流場(chǎng)特性和機(jī)理的研究很不充分。針對(duì)固定測(cè)點(diǎn)測(cè)量對(duì)流場(chǎng)干擾大,而PIV等傳統(tǒng)場(chǎng)測(cè)量又存在設(shè)備復(fù)雜,足尺空間難以應(yīng)用等問(wèn)題,本文利用熱表面溫度分布與其附近氣流場(chǎng)之間的關(guān)聯(lián)性,提出基于紅外熱成像的熱表面附近氣流場(chǎng)測(cè)量理論及應(yīng)用技術(shù)。為了深入分析該理論及技術(shù)方法的適用性,進(jìn)行了以下研究:(1)根據(jù)熱表面自身特點(diǎn)以及相關(guān)理論知識(shí),初步建立基于紅外熱成像的熱表面附近氣流場(chǎng)測(cè)量技術(shù)方法。(2)基于紅外熱成像的熱表面附近氣流場(chǎng)測(cè)量技術(shù)的實(shí)驗(yàn)研究。設(shè)計(jì)并搭建實(shí)驗(yàn)臺(tái),提出測(cè)試實(shí)驗(yàn)方法,進(jìn)行初步基礎(chǔ)模型實(shí)驗(yàn)。(3)通過(guò)與熱線以及PIV測(cè)量結(jié)果進(jìn)行比較,分析紅外熱成像測(cè)速技術(shù)的可行性和適用性,本課題采用理論分析與實(shí)驗(yàn)研究相結(jié)合的方法進(jìn)行研究,對(duì)上述內(nèi)容進(jìn)行了研究,得出:通過(guò)對(duì)紅外熱成像理論及其測(cè)溫影響因素的研究,以及建立了熱表面的能量方程,從理論上分析熱表面上的能量傳遞,同時(shí)也可以得出影響能量傳遞的影響因素。類比PIV技術(shù)原理以及處理過(guò)程,初步建立基于紅外熱成像的熱表面附近氣流場(chǎng)測(cè)量技術(shù)方法,從理論上分析該技術(shù)是可行的。通過(guò)基礎(chǔ)模型對(duì)比實(shí)驗(yàn)驗(yàn)證,基于紅外熱成像的熱表面附近流場(chǎng)測(cè)速技術(shù)適用于自然對(duì)流工況下熱表面附近流場(chǎng)的測(cè)量,而對(duì)于流速較高以及表面溫差較小的受迫對(duì)流工況下的熱表面附近流場(chǎng)測(cè)量有待進(jìn)一步驗(yàn)證。利用基于紅外熱成像的熱表面附近流場(chǎng)測(cè)速技術(shù)獲取流場(chǎng)的湍動(dòng)特性需要處理大量的瞬時(shí)矢量場(chǎng),才能很好地捕捉到流場(chǎng)特性�；诩t外熱成像的熱表面附近流場(chǎng)測(cè)速技術(shù)只用到紅外熱像儀,相比PIV技術(shù),其測(cè)試儀器少,操作簡(jiǎn)單,不需要反復(fù)調(diào)試。這是發(fā)展迅猛的紅外測(cè)溫理論及相關(guān)技術(shù)在流場(chǎng)可視化領(lǐng)域的又一創(chuàng)新。在后續(xù)的研究中,會(huì)不斷完善后處理過(guò)程,從而提高基于紅外熱成像的熱表面附近流場(chǎng)測(cè)速技術(shù)的測(cè)速效率。
[Abstract]:With the improvement of people's living standards, the requirements for indoor comfort become higher and higher, especially in winter heating rooms. The air flow field near the hot surface of the heating terminal in the actual building will affect the indoor thermal environment and the comfort of the people. Due to the complexity of the flow field itself and the limitation of the measurement technique, the research on the characteristics and mechanism of the air field near the hot surface is not enough. In view of the large interference of the fixed measurement point to the flow field, and the complicated equipment of the traditional field measurement such as PIV and the difficulty in the application of the full-scale space, this paper makes use of the correlation between the temperature distribution of the hot surface and the air flow field near it. The measurement theory and application technology of air flow field near the hot surface based on infrared thermal imaging are presented. In order to analyze the applicability of the theory and technical method, the following studies have been carried out: (1) according to the characteristics of the thermal surface and related theoretical knowledge, The method of measuring the gas flow field near the hot surface based on infrared thermal imaging is established. (2) the experimental study on the measurement technique of the gas flow field near the hot surface based on infrared thermal imaging. Design and build the experimental platform, put forward the test method, carry on the preliminary basic model experiment. (3) compare with the hot wire and the PIV measurement result, analyze the feasibility and applicability of the infrared thermal imaging velocity measurement technology. In this paper, the combination of theoretical analysis and experimental research is used to study the above-mentioned contents. The results are as follows: through the study of infrared thermal imaging theory and the influencing factors of temperature measurement, the energy equation of thermal surface is established, and the energy equation of thermal surface is established, and the energy equation of thermal surface is established. The energy transfer on the thermal surface can be analyzed theoretically, and the influence factors of energy transfer can also be obtained. By analogy to the principle and processing process of PIV technology, a method for measuring the air flow field near the hot surface based on infrared thermal imaging is established. The feasibility of this technique is analyzed theoretically. The experimental results show that the flow field near the thermal surface based on infrared thermal imaging is suitable for the measurement of the flow field near the hot surface under the natural convection condition. However, for forced convection with high velocity and small surface temperature difference, the measurement of the flow field near the hot surface needs to be further verified. It is necessary to deal with a large number of instantaneous vector fields to capture the turbulent characteristics of the flow field by using the technique of measuring the velocity of the flow field near the hot surface based on infrared thermal imaging in order to capture the characteristics of the flow field very well. The infrared thermal imaging-based velocity measurement technique for the flow field near the hot surface only uses the infrared thermal imager. Compared with the PIV technology, the measuring instrument is less, the operation is simple, and there is no need for repeated debugging. This is a rapid development of infrared temperature measurement theory and related technology in the field of flow field visualization of another innovation. In the follow-up research, the post-processing process will be improved continuously, so as to improve the velocity measurement efficiency of the velocity measurement technique for the flow field near the hot surface based on infrared thermal imaging.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU832;TU111

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本文編號(hào)：2461864