【摘要】：近年來(lái),立方體擬形試驗(yàn)作為研究城市大氣邊界層擴(kuò)散特征的一個(gè)手段得到了廣泛的開展。隨著研究的深入,對(duì)于試驗(yàn)用擬形塊體的設(shè)計(jì)也提出了更高的要求,以使實(shí)驗(yàn)結(jié)果更接近實(shí)際城市冠層的情況。該文通過對(duì)不同布置形式、不同頂高差異度的立方體冠層進(jìn)行大渦模擬試驗(yàn),討論了冠層內(nèi)結(jié)構(gòu)頂高差異度和流向上結(jié)構(gòu)均勻的程度對(duì)冠層內(nèi)大氣流態(tài)的影響規(guī)律。結(jié)果表明,立方體冠層內(nèi)的流動(dòng)結(jié)構(gòu)很大程度上取決于主風(fēng)向上結(jié)構(gòu)的均勻程度;頂高的差異性亦會(huì)造成冠層內(nèi)流態(tài)改變,且流態(tài)的改變隨立方體冠層布置形式的改變而改變;冠層頂部紊流對(duì)動(dòng)量的有效傳輸效率和冠層內(nèi)頂高的差異性有關(guān),其在主流向結(jié)構(gòu)不均勻程度低的冠層內(nèi)較小。
[Abstract]:In recent years, cubic mimetic experiments have been widely developed as a means to study the diffusion characteristics of urban atmospheric boundary layer. With the deepening of the research, higher requirements are put forward for the design of the simulated block for the test, so that the experimental results are closer to the actual urban crown. In this paper, the effects of the top height difference and the uniformity of the upper structure on the atmospheric flow pattern in the crown are discussed by means of large vortex simulation experiments on the cube crown with different arrangement forms and different top height differences. The results show that the flow structure in the cube crown depends to a large extent on the uniformity of the upward structure of the main wind, and the difference of the top height will also cause the change of the flow pattern in the crown, and the change of the flow pattern will change with the change of the arrangement of the cube crown. The effective transport efficiency of momentum at the top of the crown is related to the difference of the height of the crown, which is smaller in the crown where the degree of inhomogeneity of the mainstream structure is low.
【作者單位】： 清華大學(xué)水沙科學(xué)與水利水電工程國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(11472156)
【分類號(hào)】：TU119

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