新建格库铁路组装式多周期HDPE板防风沙机理研究
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摘要
通过ANSYS数值模拟研究了不同孔隙率组装式多周期HDPE板固沙土工格在不同风速下流场变化、防护距离以及积沙形态变化过程。结果表明:当气流通过HDPE板时,在其周围形成六个速度分区,分别为迎风侧正压低速区、抬升增速区、集流加速区、第一、第二负压减速区和速度恢复区;当风速较小时,大孔隙率HDPE板的防护距离大于小孔隙率的防护距离,当风速较大时,不同孔隙率HDPE板防护距离变化不大;HDPE板内积沙形态随时间是一个动态变化的过程,当风速较小时,比较容易形成规则的凹曲面;大孔隙率HDPE板防沙形式以积沙为主,小孔隙率的HDPE板以阻沙为主;HDPE板内积沙量受风速和孔隙率影响明显,同一风速下孔隙率越小,板内平均积沙厚度越小,积沙量越少,同一孔隙率下风速越小HDPE板内以及板前积沙厚度越大,积沙量越多。
In this research,the variation of flow field and sand accumulation process and the protective distance of assembled multi-cycle board with different porosity under different wind speed were carried out by ANSYS numerical simulation. The results show that when the airflow passes through the HDPE board,six velocity zones are formed around it,they are positive pressure low air speed zone at windward side,air uplift acceleration zone,air flow accelerated zone,the first and second negative pressure air deceleration zone,air speed recovery zone;when the wind speed is small,the protective distance of HDPE board with large porosity is longer than that of the small porosity; when the wind speed is large,protective distance change of the HDPE board with different porosity is not obvious; the shape of sand accumulation in HDPE board is a dynamic process with time; when the wind speed is small,it is easier to form a regular concave surface; sand control of the HDPE board with large porosity is dominated by sand accumulation,while the HDPE board with small porosity is dominated by sand resistance;the amount of sand accumulation in HDPE board is obviously influenced by the wind speed and porosity,the smaller the porosity under the same wind speed,the smaller the average thickness of sand accumulation,the smaller the amount of sand; the smaller the wind speed under the same porosity,the greater the thickness of sand around the HDPE board,the more the amount of sand.
In this research,the variation of flow field and sand accumulation process and the protective distance of assembled multi-cycle board with different porosity under different wind speed were carried out by ANSYS numerical simulation. The results show that when the airflow passes through the HDPE board,six velocity zones are formed around it,they are positive pressure low air speed zone at windward side,air uplift acceleration zone,air flow accelerated zone,the first and second negative pressure air deceleration zone,air speed recovery zone;when the wind speed is small,the protective distance of HDPE board with large porosity is longer than that of the small porosity; when the wind speed is large,protective distance change of the HDPE board with different porosity is not obvious; the shape of sand accumulation in HDPE board is a dynamic process with time; when the wind speed is small,it is easier to form a regular concave surface; sand control of the HDPE board with large porosity is dominated by sand accumulation,while the HDPE board with small porosity is dominated by sand resistance;the amount of sand accumulation in HDPE board is obviously influenced by the wind speed and porosity,the smaller the porosity under the same wind speed,the smaller the average thickness of sand accumulation,the smaller the amount of sand; the smaller the wind speed under the same porosity,the greater the thickness of sand around the HDPE board,the more the amount of sand.
引文
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[14]辛国伟,程建军,景文宏,等.来流廓线对风沙流场和风沙堆积影响的数值模拟-以挡沙墙为例[J].干旱区研究,2016,33(3):672-679.
[15]Cheng J J,Xin G W,Zhi L Y,et al. Unloading characteristics of sand-drift in wind-shallow areas along railway and the effect of sand removal by force of wind[J]. Scientific Reports,2017(7):41462.
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[17]程建军,智凌岩,薛春晓,等.铁路沿线下导风板对风沙流场的控制规律[J].中国铁道科学,2017,38(6):16-23.
[18]钟卫,刘涌江,杨涛. 3种沙障防风固沙效益比较的风洞实验研究[J].水土保持学报,2008,22(6):7-12.
[19]Wang T,Qu J J,Ling Y Q,et al. Shelter effect efficacy of sand fences:A comparison of systems in a wind tunnel[J]. Aeolian Research,2018,30:32-40.
[20]丁国栋.风沙物理学[M].北京:中国林业出版社,2010.
[21]汪言在,伍永秋,苟诗薇.塔克拉玛干沙漠中部地区两类半隐蔽格状沙障内部沉积粒度特征浅析[J].中国沙漠,2009,29(6):1056-1062.
[2]王涛,等.中国风沙防治工程学[M].北京:科学出版社,2011.
[3]Parsons D R,Wiggs G F,Walker I J,et al. Numerical modeling of airflow over an idealized transverse dune[J]. Environmental Modeling and Software,2004,19(2):153-162.
[4]Gillies J A,Etyemezian V,Nikolich G,et al. Effectiveness of an array of porous fences to reduce sand flux:Oceano Dunes,Oceano CA[J].Journal of Wind Engineering and Industrial Aerodynamics,2017,168:247-259.
[5]Gillies J A,Nickling W G,Nikolich G,et al. A wind tunnel study of the aerodynamic and sand trapping properties of porous mesh 3-dimensional roughness elements[J]. Aeolian Research,2017,25:23-35.
[6]Bruno L,Fransos D,Lo Giudice A. Solid barriers for windblown sand mitigation:Aerodynamic behavior and conceptual design guidelines[J].Journal of Wind Engineering and Industrial Aerodyna-mics,2018,173:79-90.
[7]张正偲,董治宝.风沙地貌形态动力学研究进展[J].地球科学进展,2014,29(6):734-747.
[8]杜会石,哈斯额尔敦,王宗明.科尔沁沙地范围确定及风沙地貌特征研究[J].北京师范大学学报(自然科学版),2017,53(1):33-37.
[9]刘虎俊,徐先英,王继和,等.黄河上游玛曲地区风沙地貌的类型及其分布[J].干旱区地理,2012,35(3):348-357.
[10]张正偲,董治宝,钱广强,等.腾格里沙漠西部和西南部风能环境与风沙地貌[J].中国沙漠,2012,32(6):1528-1533.
[11]Zhang K C,Qu J J,Liao K T,et al. Damage by wind-blown sand and its control along Qinghai-Tibet Railway in China[J]. Aeolian Research,2010,1(3):143-146.
[12]屈建军,井哲帆,张克存,等. HDPE蜂巢式固沙障研制与防沙效应实验研究[J].中国沙漠,2008,28(4):599-604.
[13]屈建军,喻文波,秦晓波. HDPE功能性固沙障防风效应试验[J].中国沙漠,2014,34(5):1185-1193.
[14]辛国伟,程建军,景文宏,等.来流廓线对风沙流场和风沙堆积影响的数值模拟-以挡沙墙为例[J].干旱区研究,2016,33(3):672-679.
[15]Cheng J J,Xin G W,Zhi L Y,et al. Unloading characteristics of sand-drift in wind-shallow areas along railway and the effect of sand removal by force of wind[J]. Scientific Reports,2017(7):41462.
[16]Cheng J J,Lei J Q,Li S Y,et al. Disturbance of the inclined inserting-type sand fence to wind-sand flow fields and its sand control characteristics[J]. Aeolian Research,2016,21:139-150.
[17]程建军,智凌岩,薛春晓,等.铁路沿线下导风板对风沙流场的控制规律[J].中国铁道科学,2017,38(6):16-23.
[18]钟卫,刘涌江,杨涛. 3种沙障防风固沙效益比较的风洞实验研究[J].水土保持学报,2008,22(6):7-12.
[19]Wang T,Qu J J,Ling Y Q,et al. Shelter effect efficacy of sand fences:A comparison of systems in a wind tunnel[J]. Aeolian Research,2018,30:32-40.
[20]丁国栋.风沙物理学[M].北京:中国林业出版社,2010.
[21]汪言在,伍永秋,苟诗薇.塔克拉玛干沙漠中部地区两类半隐蔽格状沙障内部沉积粒度特征浅析[J].中国沙漠,2009,29(6):1056-1062.