Method and experimental device for measuring flow field of human upper respiratory tract based on particle image velocimetry (PIV) technology
An upper respiratory tract and experimental device technology, applied in measurement devices, fluid dynamics tests, testing of machine/structural components, etc., can solve problems such as few experimental studies, no consensus, and no consideration of wall elasticity.
An upper respiratory tract and experimental device technology, applied in measurement devices, fluid dynamics tests, testing of machine/structural components, etc., can solve problems such as few experimental studies, no consensus, and no consideration of wall elasticity.
CN102564728BActive Publication Date: 2014-11-19SANITARY EQUIP INST ACAD OF MILITARY MEDICAL SCI PLA
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[0020] The present invention will be further described below in conjunction with the accompanying drawings.
[0021] Such as figure 1 As shown, the hardware system of the present invention includes three parts: a real human upper airway model, an airway system and a PIV test system.
[0022] figure 2 Shown is a real human body upper airway model, the model includes oral cavity 41, uvula, pharynx 42, epiglottis, larynx, glottis, pyriform sinuses 43, trachea 44 and the first three bronchi; the mouth entrance of the model is simplified as Round, the oral cavity is arched, the entrance of the oral cavity is along the horizontal direction, and the height of the back of the tongue is 33.55 mm; the uvula of the model is on the upper wall of the oral cavity close to the front wall of the pharynx, and the height is 6.14 mm; the model The shape of the pharynx is irregular, the sagittal position is larger than the coronal position, and the pharynx and the floor of the mouth are connec...
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The invention discloses a method and an experimental device for measuring the flow field of a human upper respiratory tract based on a particle image velocimetry (PIV) technology. According to the invention, a true human upper respiratory tract model is taken as a research object, and the pumping effect of a vacuum pump is utilized to ensure that gas forms a channel in the model so as to simulate the respiratory process of a human lung. The method comprises the following steps of: scattering trace particles in the flow field, irradiating the flow field of the human upper respiratory tract model by using a sheet light source generated by a laser, aligning an area to be measured in a direction vertical to the sheet light source by using a cross-frame charge coupled device (CCD) camera, recording images of the particles during double pulse laser exposure according to the scattering effect of the trace particles on light, transmitting the images into a computer, computing and analyzing, solving the velocity of a fluid in the flow field of the human upper respiratory tract model by an autocorrelation or cross-correlation algorithm, and thus obtaining the characteristics of a vortex structure of the airflow of the flow field of the human upper respiratory tract during inspiration, an evolution form of the vortex structure, and the change and a distribution form of shear stress at the same time.
Description
technical field [0001] The invention relates to technical fields such as biomedical engineering, sanitation protection and epidemic prevention technology and equipment, man-machine-environment system engineering and fluid mechanics, and in particular relates to a measurement method and an experimental device suitable for measuring the air flow field of the human upper respiratory tract . Background technique [0002] As a basic means of studying various complex flow fields, PIV technology has been widely used in various flow measurement and display. Many scholars at home and abroad have applied this measurement technology to the research in the field of ventilation. From steady to unsteady, low-speed to high-speed, single-phase to multi-phase, record the relevant information of the entire measurement plane at the same time, so as to obtain the instantaneous velocity field, fluctuating velocity field, vorticity field and Reynolds stress distribution of the flow, etc., which i...
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Patent Timeline
19 Nov 2014
Publication
CN102564728B
- IPC
- G01M10/00; G01M9/06; G01M9/08
- Inventors
- 徐新喜; 李福生