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STUDY ON THE IMPROVEMENT OF AIR CURTAIN PERFORMANCE BY THE MANIPULATION OF VORTICES

旋涡调控改善风幕性能的研究

基本信息

批准号：
09650203
负责人：
TOYODA Kuniaki
金额：
$ 2.05万
依托单位：
HOKKAIDO INSTITUTE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650203/
关键词：
AIR CURTAIN JET VORTEX FLOW CONTROL THREE-DIMENSIONAL PERTURBATION エアカ-テン

项目摘要

(1) A heating box was built up as the experimental apparatus to measure the performance of air curtain. The size of the box is 1.5m×1.5m×1.5m, and an air curtain is installed at an opening door of the box. The air is issued from the top and sucked into the bottom. The ribbon heater is pasted on the floor, and the temperatures inside and outside of the box are measured by thermocouple. The data are recorded in a hybrid recorder and processed by a data processing computer. The performance of the box was confirmed to be good for the study of air curtain.(2) The heat transfer through the air curtain perturbed by saw-shape roughness was measured and compared with that without the perturbation. The difference of the temperatures inside and outside of the box increased fifty percents, which results from the suppression of the large-scale vortices in the air curtain by the three-dimensional perturbation generated by saw-shape roughness.(3) The effect of three-dimensional perturbation on jet diffusion was studied by the experiments of jets. The saw-shape roughness and soft fibers were attached at the jet exit to generate three-dimensional perturbations. The characteristics of diffusion were discussed by considering the measured velocity profiles. The result shows that the perturbations are very effective to suppress jet diffusion. From the result we suggest the suitable features of saw-shape roughness and soft fibers.

(1)搭建了加热箱作为实验装置，对空气幕性能进行了测试。箱体尺寸为1.5m×1.5m×1.5m，箱体开口门处安装有风幕。空气从顶部排出，然后吸入底部。将带状加热器粘贴在地板上，用热电偶测量箱内和箱外的温度。数据被记录在混合记录器中，并由数据处理计算机进行处理。对锯齿形粗糙度扰动下的空气幕换热进行了测量，并与无扰动时的换热情况进行了比较。由于锯齿状粗糙度产生的三维扰动抑制了气幕内的大尺度涡流，箱体内外温差增大了50%。(3)通过射流实验研究了三维扰动对射流扩散的影响。锯齿状的粗糙度和柔软的纤维附着在射流出口处，产生三维扰动。结合测量的速度分布，讨论了扩散的特性。结果表明，扰动对抑制射流扩散是非常有效的。根据结果，我们提出了锯状粗糙度和柔软纤维的合适特征。