基于红外热成像的热表面附近气流场测量技术的研究
发布时间：2019-04-20 19:02
【摘要】：随着人们生活水平的提高,对室内舒适度要求也越来越高,尤其是冬季供暖房间。实际建筑中供暖末段热表面附近气流场会影响室内热环境以及人员舒适度。由于流场自身的复杂性、测量技术手段上的局限性,关于热表面附近气流场特性和机理的研究很不充分。针对固定测点测量对流场干扰大,而PIV等传统场测量又存在设备复杂,足尺空间难以应用等问题,本文利用热表面温度分布与其附近气流场之间的关联性,提出基于红外热成像的热表面附近气流场测量理论及应用技术。为了深入分析该理论及技术方法的适用性,进行了以下研究:(1)根据热表面自身特点以及相关理论知识,初步建立基于红外热成像的热表面附近气流场测量技术方法。(2)基于红外热成像的热表面附近气流场测量技术的实验研究。设计并搭建实验台,提出测试实验方法,进行初步基础模型实验。(3)通过与热线以及PIV测量结果进行比较,分析红外热成像测速技术的可行性和适用性,本课题采用理论分析与实验研究相结合的方法进行研究,对上述内容进行了研究,得出:通过对红外热成像理论及其测温影响因素的研究,以及建立了热表面的能量方程,从理论上分析热表面上的能量传递,同时也可以得出影响能量传递的影响因素。类比PIV技术原理以及处理过程,初步建立基于红外热成像的热表面附近气流场测量技术方法,从理论上分析该技术是可行的。通过基础模型对比实验验证,基于红外热成像的热表面附近流场测速技术适用于自然对流工况下热表面附近流场的测量,而对于流速较高以及表面温差较小的受迫对流工况下的热表面附近流场测量有待进一步验证。利用基于红外热成像的热表面附近流场测速技术获取流场的湍动特性需要处理大量的瞬时矢量场,才能很好地捕捉到流场特性。基于红外热成像的热表面附近流场测速技术只用到红外热像仪,相比PIV技术,其测试仪器少,操作简单,不需要反复调试。这是发展迅猛的红外测温理论及相关技术在流场可视化领域的又一创新。在后续的研究中,会不断完善后处理过程,从而提高基于红外热成像的热表面附近流场测速技术的测速效率。
[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.
【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】：TU832;TU111
本文编号：2461864
[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.
【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】：TU832;TU111
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