Xu Zhengzheng,Gao Yong,Han Yanlong,et al.Wind Gathering Effect of Wind Guide Plate with Different Outlet Heights Based on Wind Tunnel Test[J].Research of Soil and Water Conservation,2023,30(06):284-294,306.[doi:10.13869/j.cnki.rswc.2023.06.022]
基于风洞模拟的不同出风口高度导风板的聚风效应
- Title:
- Wind Gathering Effect of Wind Guide Plate with Different Outlet Heights Based on Wind Tunnel Test
- 文章编号:
- 1005-3409(2023)06-0284-11
- Keywords:
- combating desertification; wind speed flow field; wind guide plate; wind tunnel test; wind gathering effect
- 分类号:
- S775
- 文献标志码:
- A
- 摘要:
- [目的]揭示不同出风口高度导风板下的风速流场特征及规律,阐明其聚风效能,进而为导风板配置模式提供理论支撑。[方法]应用风洞模拟手段,测定不同风向夹角(β=90°,β=60°,β=45°和β=30°)条件下,不同出风口高度(h=3 cm,h=5 cm,h=7 cm,h=9 cm)导风板的流场特征,分析1/2出风口高度处的相对风速。从而选取风向夹角(β)、出风口高度(h)、来流风速(V0)以及距离导风板的水平距离(x)等对导风板1/2出风口高度处各点位风速〔V(x)〕进行多元回归建模。[结果](1)各风向夹角条件下,不同出风口高度导风板均形成一定范围的强风区和增速区,但不同出风口高度及风向夹角下其流场特征存在差异。β=90°时,h=3 cm和h=5 cm导风板的增速区和强风区影响范围分别为最大; β=60°时,h=9 cm导风板形成的增速区和强风区影响范围均最大; β=45°和β=30°时,h=9 cm导风板增速区和集流加速区影响范围均最大。(2)β=90°和β=60°时,各导风板1/2出风口高度处相对风速随水平距离的变化近似呈“N”形。由于狭管效应,在0.5 H(H为模型高度)处达到相对风速峰值,而后气流发生扩散,到2 H处降至最低值。随迎风夹角减小,导风板垂直风向投影面积急剧减小,过境气流在板后汇集,此时对水平测点1 H后气流有较强加速效果。(3)1/2出风口高度处导风板风速预测模型为V(x)=-0.144+0.145h+(-0.022)β+0.808V0+0.092x(R2=0.758)。[结论]风向夹角β=60°时,h=9 cm导风板聚风效果最优; 构建的预测模型参数选用较为合理,模型拟合程度较高,可为导风板干扰下1/2出风口高度处各点位风速预测提供理论支撑。
- Abstract:
- [Objective] The aims of this study are to explore the characteristics and rules of the wind speed flow field under different outlet height wind guide plates, clarify its wind gathering effect, and then to provide theoretical support for the configuration mode of wind guide plates. [Method] By means of wind tunnel simulation, the flow characteristics of the wind guide plate with different air outlet heights were measured under different wind direction angles, and the relative wind speed at 1/2 air outlet height was analyzed. The wind speed 〔V(x)〕 at each point at 1/2 the height of the air vent of the wind guide plate was modeled by multiple regression by selecting the angle between the wind direction(β), the height of the air vent(h), the incoming wind speed(V0), and the horizontal distance from the wind guide plate(x). [Results](1)Under the condition of wind angle, the wind guide plates all formed a certain range of strong wind zone and growth zone, but its flow field characteristics were different under different air outlet height and wind direction angle. When β was 90°, the influence range of the growing zone and the strong wind zone of the h=3 cm and h=5 cm wind guide plate were the largest. When β was 60°, the influence range of the growth zone and the strong wind zone formed by the h=9 cm wind guide plate was the largest. When β was 45° and β was 30°, the influence range of h=9 cm wind guide plate increasing zone and gathering flow accelerating zone were the largest.(2)When β was 90° and β was 60°, the relative wind speed at 1/2 outlet height of each wind guide plate changed with horizontal distance approximately in the shape of ‘N'. Due to the narrow pipe effect, most of them could reach the peak value of relative wind speed at 0.5 H(H stands for model height), and then the air flow spread and dropped to the lowest value of relative wind speed at 2 H. As the angle between windward decreased, the vertical wind direction projection area of the wind guide plate decreased sharply, and the transit air collected behind the wind guide plate. At this time, the airflow of the horizontal measuring point after 1 H had a strong acceleration effect.(3)The wind speed prediction model of the wind guide plate at the height of 1/2 air outlet was V(x)=-0.144+0.145h+(-0.022)β+0.808V0+0.092x(R2=0.758). [Conclusion] In the effect of wind gathering effect, when the wind direction angle β=60°, h=9 cm wind guide plate has the best wind accumulation effect. The parameters of the constructed prediction model were reasonable, and the model has a high degree of fitting, which can provide theoretical support for the wind speed prediction at each point at the height of 1/2 outlet under the interference of the wind guide plate.
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备注/Memo
收稿日期:2022-10-29 修回日期:2022-11-05
资助项目:内蒙古科技攻关项目“库布齐沙漠沿黄段流动沙丘综合治理技术研究”(2021GG0073); 内蒙古农业大学“高层次人才引进科研启动项目”(NDYB2018-36)
第一作者:徐铮铮(1996—),女,辽宁凌源人,硕士研究生,研究方向为荒漠化防治。E-mail:1637278644@qq.com
通信作者:高永(1962—),男,内蒙古包头人,博士,教授,主要从事荒漠化防治研究。E-mail:13948815709@163.com