本文主要研究内容
作者高政（2019）在《三维城市建筑布局下街谷风环境与污染物扩散的研究》一文中研究指出：近些年,随着我国经济技术的飞速发展与城市化进程的加快,我国机动车保有量持续上升,机动车数量的增长虽给人民带来很多便捷,但其排放的尾气污染物已成为城市街区空气污染的重要源头。同时,城市建设用地日趋紧张,建筑群的密度迅速增加,街道道路两侧鳞次栉比的高大建筑物与街道形成众多“街道峡谷”,严重影响了街区尾气污染物的扩散稀释,使得污染物在街道内聚集,对过往行人的身体健康危害严重。因此,研究城市街道峡谷中的风环境与污染物扩散规律,对于改善城市街区空气环境,提高城市居民的生活品质至关重要。本文采用CFD数值模拟技术对三维城市建筑布局下,微尺度范围内的街谷风环境与污染物扩散进行分析,模拟过程选取标准-k?模型和组分输送模型,首先分析建筑布局和建筑相对高度两种单一影响因素对街区空气环境的影响,然后进一步分析某段城市复杂建筑格局下街区空气环境。结论如下:首先,三种城市建筑布局中,对称式布局流经建筑群周围的气流比较均匀,交错式布局中气流受建筑阻碍作用更明显,在街谷内扰流非常明显;受布局的影响,街谷上游有阻挡建筑时污染物主要聚集在街谷背风面和中心面之间,上游无阻挡建筑时污染物主要聚集在街谷迎风面和中心面之间;在街谷一内流速大小满足(布局I<布局II<布局III)的趋势,而街谷二内近似满足(布局II<布局III<布局I)的趋势。街谷一内浓度大小满足(布局III<布局I<布局II)的趋势,而街谷二内近似满足(布局II<布局III<布局I)的趋势。街谷内污染物浓度分布受流速大小和涡流结构双重因素的的影响;每种布局在街谷二中污染物平均浓度均大于街谷一,同一布局不同街谷内污染物存在差异。其次,四种上下游建筑高度有差异的街谷中,受临街建筑与上下游建筑高度的影响,不同类型目标街谷内的漩涡结构和流速大小存在一定的差别,对目标街谷内的污染物浓度扩散分布产生影响,其中凹字形街谷会有污染物扩散到上游街谷,而其它三种类型街谷内污染物未对上游街谷造成影响,污染物仅会扩散到下游街谷;每种街谷统计范围内,凹字型街谷内气流速度最小,上升型和凸字型街谷内气流速度基本最大。对于每个街谷内的污染物浓度,凸字型街谷内的污染物浓度最高,下降型污染物浓度最低;四种类型街谷中,下降型街谷最有利于污染物扩散。最后,对于较为复杂的城市街谷类型中,风向由正北流入时,针对所分析的不同典型高度平面,污染物沿高度方向依次呈现连续的线状→线状+部分团状→团状→断裂的团状等形式。通过控制建筑的连续界面引导街谷内的气流横向绕流,或在临街上游设置合适的开敞空间,以增加来流通风廊道,可有效改变街谷中污染物扩散情况;西北风下,4条主干道中气流发生了很大变化,在近地面1.6m和10m处,在支路内的平行气流转变成更为明显的绕流气流,在主干道中污染物在居中的位置大量聚集。在20m和30m的高度平面,上游开敞空间的增大,增大了来流气流的迎风面积,使得污染物整体向街区建筑群东南侧扩散;来流风向不同时每条街道中污染物停留时间不同,风向改变对每条街道内的污染物浓度分布影响不同,每段街谷中的污染物扩散不是孤立单独的系统,而是相互关联的有机整体。
Abstract
jin xie nian ,sui zhao wo guo jing ji ji shu de fei su fa zhan yu cheng shi hua jin cheng de jia kuai ,wo guo ji dong che bao you liang chi xu shang sheng ,ji dong che shu liang de zeng chang sui gei ren min dai lai hen duo bian jie ,dan ji pai fang de wei qi wu ran wu yi cheng wei cheng shi jie ou kong qi wu ran de chong yao yuan tou 。tong shi ,cheng shi jian she yong de ri qu jin zhang ,jian zhu qun de mi du xun su zeng jia ,jie dao dao lu liang ce lin ci zhi bi de gao da jian zhu wu yu jie dao xing cheng zhong duo “jie dao xia gu ”,yan chong ying xiang le jie ou wei qi wu ran wu de kuo san xi shi ,shi de wu ran wu zai jie dao nei ju ji ,dui guo wang hang ren de shen ti jian kang wei hai yan chong 。yin ci ,yan jiu cheng shi jie dao xia gu zhong de feng huan jing yu wu ran wu kuo san gui lv ,dui yu gai shan cheng shi jie ou kong qi huan jing ,di gao cheng shi ju min de sheng huo pin zhi zhi guan chong yao 。ben wen cai yong CFDshu zhi mo ni ji shu dui san wei cheng shi jian zhu bu ju xia ,wei che du fan wei nei de jie gu feng huan jing yu wu ran wu kuo san jin hang fen xi ,mo ni guo cheng shua qu biao zhun -k?mo xing he zu fen shu song mo xing ,shou xian fen xi jian zhu bu ju he jian zhu xiang dui gao du liang chong chan yi ying xiang yin su dui jie ou kong qi huan jing de ying xiang ,ran hou jin yi bu fen xi mou duan cheng shi fu za jian zhu ge ju xia jie ou kong qi huan jing 。jie lun ru xia :shou xian ,san chong cheng shi jian zhu bu ju zhong ,dui chen shi bu ju liu jing jian zhu qun zhou wei de qi liu bi jiao jun yun ,jiao cuo shi bu ju zhong qi liu shou jian zhu zu ai zuo yong geng ming xian ,zai jie gu nei rao liu fei chang ming xian ;shou bu ju de ying xiang ,jie gu shang you you zu dang jian zhu shi wu ran wu zhu yao ju ji zai jie gu bei feng mian he zhong xin mian zhi jian ,shang you mo zu dang jian zhu shi wu ran wu zhu yao ju ji zai jie gu ying feng mian he zhong xin mian zhi jian ;zai jie gu yi nei liu su da xiao man zu (bu ju I<bu ju II<bu ju III)de qu shi ,er jie gu er nei jin shi man zu (bu ju II<bu ju III<bu ju I)de qu shi 。jie gu yi nei nong du da xiao man zu (bu ju III<bu ju I<bu ju II)de qu shi ,er jie gu er nei jin shi man zu (bu ju II<bu ju III<bu ju I)de qu shi 。jie gu nei wu ran wu nong du fen bu shou liu su da xiao he guo liu jie gou shuang chong yin su de de ying xiang ;mei chong bu ju zai jie gu er zhong wu ran wu ping jun nong du jun da yu jie gu yi ,tong yi bu ju bu tong jie gu nei wu ran wu cun zai cha yi 。ji ci ,si chong shang xia you jian zhu gao du you cha yi de jie gu zhong ,shou lin jie jian zhu yu shang xia you jian zhu gao du de ying xiang ,bu tong lei xing mu biao jie gu nei de xuan guo jie gou he liu su da xiao cun zai yi ding de cha bie ,dui mu biao jie gu nei de wu ran wu nong du kuo san fen bu chan sheng ying xiang ,ji zhong ao zi xing jie gu hui you wu ran wu kuo san dao shang you jie gu ,er ji ta san chong lei xing jie gu nei wu ran wu wei dui shang you jie gu zao cheng ying xiang ,wu ran wu jin hui kuo san dao xia you jie gu ;mei chong jie gu tong ji fan wei nei ,ao zi xing jie gu nei qi liu su du zui xiao ,shang sheng xing he tu zi xing jie gu nei qi liu su du ji ben zui da 。dui yu mei ge jie gu nei de wu ran wu nong du ,tu zi xing jie gu nei de wu ran wu nong du zui gao ,xia jiang xing wu ran wu nong du zui di ;si chong lei xing jie gu zhong ,xia jiang xing jie gu zui you li yu wu ran wu kuo san 。zui hou ,dui yu jiao wei fu za de cheng shi jie gu lei xing zhong ,feng xiang you zheng bei liu ru shi ,zhen dui suo fen xi de bu tong dian xing gao du ping mian ,wu ran wu yan gao du fang xiang yi ci cheng xian lian xu de xian zhuang →xian zhuang +bu fen tuan zhuang →tuan zhuang →duan lie de tuan zhuang deng xing shi 。tong guo kong zhi jian zhu de lian xu jie mian yin dao jie gu nei de qi liu heng xiang rao liu ,huo zai lin jie shang you she zhi ge kuo de kai chang kong jian ,yi zeng jia lai liu tong feng lang dao ,ke you xiao gai bian jie gu zhong wu ran wu kuo san qing kuang ;xi bei feng xia ,4tiao zhu gan dao zhong qi liu fa sheng le hen da bian hua ,zai jin de mian 1.6mhe 10mchu ,zai zhi lu nei de ping hang qi liu zhuai bian cheng geng wei ming xian de rao liu qi liu ,zai zhu gan dao zhong wu ran wu zai ju zhong de wei zhi da liang ju ji 。zai 20mhe 30mde gao du ping mian ,shang you kai chang kong jian de zeng da ,zeng da le lai liu qi liu de ying feng mian ji ,shi de wu ran wu zheng ti xiang jie ou jian zhu qun dong na ce kuo san ;lai liu feng xiang bu tong shi mei tiao jie dao zhong wu ran wu ting liu shi jian bu tong ,feng xiang gai bian dui mei tiao jie dao nei de wu ran wu nong du fen bu ying xiang bu tong ,mei duan jie gu zhong de wu ran wu kuo san bu shi gu li chan du de ji tong ,er shi xiang hu guan lian de you ji zheng ti 。
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论文作者分别是来自吉林建筑大学的高政，发表于刊物吉林建筑大学2019-10-23论文，是一篇关于街道峡谷论文,保有量论文,数值模拟论文,气流速度论文,污染物浓度论文,吉林建筑大学2019-10-23论文的文章。本文可供学术参考使用，各位学者可以免费参考阅读下载，文章观点不代表本站观点，资料来自吉林建筑大学2019-10-23论文网站，若本站收录的文献无意侵犯了您的著作版权，请联系我们删除。
标签：街道峡谷论文; 保有量论文; 数值模拟论文; 气流速度论文; 污染物浓度论文; 吉林建筑大学2019-10-23论文;