通风射流纹影成像可视化实验设计

Experimental Design of Ventilation Jet Visualization with Schlieren Imaging Technique

针对通风工程中气流不可视、射流理论抽象,学生无法对气流分布形成直观认识的难点,该文利用纹影成像技术构思了自由射流理论的新实验方法,并进行了实验教学设计。实验利用纹影成像技术可视化效果突出、能够进行流场尺寸量化的优点,制作了一种基于纹影成像原理的Y型光学实验系统,在通风空调实验平台基础上配合传统热敏风速元件的测量,可充分展示通风射流的湍流发展和变化规律,并获得定量特征参数。该实验利用纹影可视化手段与通风射流理论相结合,实验结果形象直观,实验过程操作性强,有助于学生充分理解通风工程中的基础射流理论知识和难点,培养学生实践和创新能力。

jet theory in ventilation engineering,this paper uses schlieren imaging technology to conceive a new experiment method for free jet theory and an experimental teaching design is carried out.Schlieren imaging technology has significant advantages as the visual effect is prominent and the size of the visualized flow field can be quantified.A“Y”type optics experiment system was established based on the principle of schlieren method.With the aid of ventilation and air conditioning experimental platform and traditional thermal measuring wind speed components,the turbulent free jet development rules can be clearly demonstrated,and quantitative characteristic parameters of the free jet can be obtained.In this experiment,schlieren visualization method is combined with ventilation jet theory,the experimental results are visual and intuitive,and the experimental process is highly operational,which helps students to fully understand the basic jet theory knowledge and difficulties in ventilation engineering,and is effective in cultivating their innovation and practical ability.