大氣邊界層風(fēng)場(chǎng)的風(fēng)洞模擬
本文選題:大氣邊界層 + 風(fēng)洞; 參考:《北京交通大學(xué)》2013年碩士論文
【摘要】:在風(fēng)洞中正確模擬大氣邊界層的流場(chǎng)特性,是風(fēng)洞實(shí)驗(yàn)結(jié)果可信的必要條件,也是風(fēng)工程研究的重要前期工作。北京交通大學(xué)風(fēng)洞實(shí)驗(yàn)室目前已經(jīng)建成,在實(shí)驗(yàn)室中正確的模擬出大氣邊界層的特性勢(shì)在必行。 風(fēng)洞中模擬大氣邊界層的方法有主動(dòng)模擬方法和被動(dòng)模擬方法兩種。主動(dòng)模擬方法有振動(dòng)翼柵、多風(fēng)扇風(fēng)洞等。尖劈—粗糙元被動(dòng)模擬技術(shù)是目前大氣邊界層風(fēng)洞模擬使用的主要技術(shù),得益于其取材方便、使用方便和經(jīng)濟(jì)的特點(diǎn)。 本文通過研究整理大氣邊界層的模擬技術(shù)的相關(guān)理論資料并實(shí)踐,采用尖劈—粗糙元模擬技術(shù)模擬出了規(guī)范中規(guī)定的四類地貌。主要工作總結(jié)如下: (1)對(duì)風(fēng)洞模擬實(shí)驗(yàn)進(jìn)行了設(shè)計(jì),包括尖劈、粗糙元和擋板的設(shè)計(jì)和加工,制定了詳細(xì)的實(shí)驗(yàn)方案和數(shù)據(jù)處理方法。 (2)通過大量對(duì)比實(shí)驗(yàn),整理出了風(fēng)場(chǎng)模擬的基本思路和尖劈、粗糙元、擋板布置方式對(duì)風(fēng)場(chǎng)模擬的影響機(jī)理。對(duì)風(fēng)場(chǎng)模擬中的衰減現(xiàn)象、溫度和采樣頻率等其他影響因素進(jìn)行了分析研究。 (3)對(duì)湍流積分尺度計(jì)算方法和脈動(dòng)風(fēng)速功率譜估計(jì)方法進(jìn)行了整理總結(jié),確定了本文的所采用的計(jì)算方法,模擬了風(fēng)洞風(fēng)場(chǎng)實(shí)測(cè)結(jié)果的湍流積分尺度剖面和脈動(dòng)風(fēng)速功率譜。
[Abstract]:The correct simulation of the flow characteristics of the atmospheric boundary layer in the wind tunnel is a necessary condition for the experimental results of the wind tunnel. It is also an important prophase work of the wind tunnel research. The Beijing Jiaotong University wind tunnel laboratory has been built now. It is imperative to correctly simulate the characteristics of the atmospheric boundary layer in the laboratory.
There are two methods to simulate the atmospheric boundary layer in the wind tunnel. There are active simulation methods and passive simulation methods. Active simulation methods have vibratory winged grid, multi fan wind tunnel and so on. The wedge rough element passive simulation technology is the main technique used in the air boundary layer wind tunnel simulation at present, benefiting from its convenience, convenience and economy.
In this paper, through the research and practice of the relevant theoretical data of the simulation technology of the atmospheric boundary layer, the four types of geomorphology specified in the specification are simulated by the wedge - rough element simulation technology. The main work is summarized as follows:
(1) the wind tunnel simulation experiment was designed, including the design and processing of the wedge, rough element and baffle. Detailed experimental plans and data processing methods were worked out.
(2) through a large number of contrast experiments, the basic ideas of wind field simulation and the influence mechanism of the splitting, rough element and baffle layout on the wind field simulation are sorted out. The attenuation phenomena, the temperature and the sampling frequency in the wind field simulation are analyzed and studied.
(3) the calculation method of the turbulence integral scale and the estimation method of the pulsating wind power spectrum are summarized, and the calculation method used in this paper is determined. The turbulence integral scale section and the pulse wind power spectrum of the wind tunnel wind field are simulated.
【學(xué)位授予單位】:北京交通大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2013
【分類號(hào)】:TU317;P425
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