本文關(guān)鍵詞：基于傳質(zhì)法的吹吸式通風(fēng)系統(tǒng)流場(chǎng)特性研究　出處：《西安建筑科技大學(xué)》2014年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 吹吸式通風(fēng)系統(tǒng) 傳質(zhì)法 射流 障礙物

【摘要】：隨著經(jīng)濟(jì)的快速發(fā)展,工業(yè)建筑室內(nèi)污染控制問(wèn)題日益突出,高效能的通風(fēng)技術(shù)是實(shí)現(xiàn)節(jié)能減排、改善工人操作環(huán)境與減少大氣污染的重要途徑。吹吸式通風(fēng)系統(tǒng)是一種有效的通風(fēng)方式。由于污染源種類眾多、污染源性質(zhì)各異,吹吸式通風(fēng)系統(tǒng)設(shè)計(jì)時(shí)并不針對(duì)某種具體污染物,而是假定污染物由射流控制和輸運(yùn),認(rèn)為控制了氣流即控制了污染物,因此吹吸式通風(fēng)系統(tǒng)的基本性能是指對(duì)流場(chǎng)的控制性能,改善基本性能是通過(guò)改變吹吸流場(chǎng)特性來(lái)完善的。射流特性對(duì)吹吸流場(chǎng)特性影響重大,而射流出射條件如速度大小、速度分布形式以及湍流參數(shù)等因素都會(huì)影響射流特性。另外建筑的空間形式、障礙物等受限條件也會(huì)對(duì)吹吸流場(chǎng)特性產(chǎn)生重要影響。對(duì)于這些參數(shù)的影響,現(xiàn)有的方法通常是依靠實(shí)驗(yàn)和數(shù)值計(jì)算來(lái)獲得不同參數(shù)下的速度場(chǎng)、溫度場(chǎng)等并對(duì)這些參數(shù)進(jìn)行優(yōu)化。為了提高吹吸式通風(fēng)系統(tǒng)的基本性能、降低能耗,研究結(jié)果有待于在物理機(jī)制及理論上深入地研究與探討。 要提高吹吸式通風(fēng)系統(tǒng)的基本性能、降低能耗,需要降低周邊環(huán)境空氣的卷入量,而通常吹風(fēng)口送風(fēng)氣流與環(huán)境空氣是相同的介質(zhì),為揭示送風(fēng)氣流與環(huán)境空氣共同作用下的流場(chǎng)特性,文中提出了標(biāo)識(shí)不同來(lái)源同質(zhì)流體的方法一一傳質(zhì)法；采用射流經(jīng)典實(shí)驗(yàn)曲線和分析解對(duì)傳質(zhì)法進(jìn)行了驗(yàn)證,證實(shí)了標(biāo)識(shí)不同來(lái)源同質(zhì)流體的傳質(zhì)法的有效性；并給出了傳質(zhì)法的應(yīng)用實(shí)例。 射流特性是影響吹吸流場(chǎng)特性的重要因素�；趥髻|(zhì)法通過(guò)數(shù)值模擬的方法得到了射流出射速度大小、速度分布形式以及湍流參數(shù)對(duì)射流摻混、卷吸特性的影響,通過(guò)場(chǎng)協(xié)同理論對(duì)這些影響因素進(jìn)行了理論分析,揭示了射流流場(chǎng)傳質(zhì)強(qiáng)化或弱化的方向。 提出吹吸式通風(fēng)系統(tǒng)性能系數(shù)指標(biāo)來(lái)評(píng)估吹吸式通風(fēng)系統(tǒng)的基本性能�；趥髻|(zhì)法通過(guò)數(shù)值模擬的方法得到了吹吸式通風(fēng)系統(tǒng)中送風(fēng)口速度大小、速度分布、湍流參數(shù)以及送風(fēng)口尺寸等因素對(duì)送風(fēng)氣流與環(huán)境空氣的摻混、卷吸特性、系統(tǒng)基本性能系數(shù)和能耗的影響,通過(guò)場(chǎng)協(xié)同理論對(duì)這些影響因素進(jìn)行了理論分析,得到了吹吸流場(chǎng)傳質(zhì)弱化的規(guī)律性認(rèn)識(shí),為指導(dǎo)吹吸式通風(fēng)系統(tǒng)的設(shè)計(jì)提供了理論依據(jù)。 障礙物會(huì)對(duì)吹吸式通風(fēng)系統(tǒng)流場(chǎng)特性產(chǎn)生重要影響。障礙物的存在使射流發(fā)生偏轉(zhuǎn),可能使射流逃逸,影響吹吸式通風(fēng)系統(tǒng)的基本性能；另外繞流障礙物后,障礙物周?chē)臀膊繒?huì)產(chǎn)生回流區(qū),污染物一旦進(jìn)入容易堆積,在實(shí)際應(yīng)用中要避免將污染源放置在回流區(qū)內(nèi)以及操作工人應(yīng)盡量減少在此區(qū)域作業(yè)�；趥髻|(zhì)法通過(guò)實(shí)驗(yàn)與數(shù)值模擬的方法,研究了障礙物位置以及障礙物尺寸對(duì)吹吸流場(chǎng)特性、吹吸式通風(fēng)系統(tǒng)基本性能系數(shù)等的影響,得到了障礙物位置與障礙物尺寸對(duì)吹吸式通風(fēng)系統(tǒng)基本性能系數(shù)、障礙物后低速區(qū)、回流區(qū)影響的規(guī)律；給出了障礙物后低速區(qū)長(zhǎng)度、回流區(qū)長(zhǎng)度的擬合關(guān)系式,為工程應(yīng)用提供一定的參考。
[Abstract]:With the rapid development of economy, industrial buildings, indoor pollution control problems have become increasingly prominent, efficient ventilation technology is an important way to realize energy saving and emission reduction, improve the working environment and reduce air pollution. The push-pull ventilation system is an effective ventilation mode. Because of many kinds of pollution sources, pollution sources of different properties, push-pull ventilation system the design is not for some specific pollutants, but assumed by the jet control and pollutant transport, air is assumed control of the control of pollutants, so the basic performance of push-pull ventilation system refers to the control performance of the flow field, improve the basic performance by changing the suction flow characteristics. To improve the characteristics of jet blowing and suction flow characteristics a major influence, and the jet exit conditions such as velocity, velocity distribution and turbulence parameters and other factors will affect the jet characteristics. In addition the empty building Among the forms, obstacles and other constraints will have great influence on the effect of blowing and suction flow characteristics. For these parameters, the existing methods usually rely on velocity field experiment and numerical calculation to obtain different parameters, the temperature field and the parameters were optimized. In order to improve the basic performance, high push-pull ventilation system to reduce energy consumption, the results need to be in the physical mechanism and theory research and explore deeply.
In order to improve the basic performance of push-pull ventilation system to reduce energy consumption, reduce the amount of need involved in ambient air, and the air flow is blowing and air is the same as the medium, the characteristics of flow field under the action of air supply and air shows, this paper proposes a method for identifying different sources of homogeneous fluid mass transfer method; solution to verify the mass transfer method using jet classical experimental curve and analysis, confirmed the validity of the mass transfer method to identify the different sources of homogeneous fluid; mass transfer method and application examples are given.
Is an important factor affecting the characteristics of jet blowing suction flow characteristics. The mass transfer method by numerical simulation based on the jet exit velocity, the jet mixing and turbulence parameters affect the velocity distribution, volume absorption characteristic, through the field synergy theory provides a theoretical analysis of these factors, reveals the flow and mass transfer enhancement or weaken the direction.
The air suction performance index system to evaluate the performance of basic ventilation push-pull ventilation system. The mass transfer method by numerical simulation based on the inlet velocity, feed push-pull ventilation system in the velocity distribution, turbulence parameters and the air outlet size and other factors on the airflow and air mixing and entrainment characteristics. Influence of system coefficient of performance and energy consumption, through the field synergy theory provides a theoretical analysis of these factors, the regularity of flow field weakening suction mass transfer knowledge, provides a theoretical basis for guiding the design of push-pull ventilation system.
The obstacles will have an important impact on the flow characteristics of blow suction ventilation system. The obstacle to jet deflection, may make the jet escape, influence of basic properties of push-pull ventilation system; also the flow around an obstacle after obstacle around and tail will produce recirculation zone, pollutants once accumulated easily in practice. Application to avoid the pollution source placed in the recirculation region and the operation of workers should be minimized in this area. Operation method based on mass transfer was simulated by experiment and numerical study, the position of the obstacle and the obstacle size on the suction flow characteristics, influence of push-pull ventilation system coefficient of performance, the location of obstacles. And the obstacle size of push-pull ventilation system coefficient of performance, obstacle after low velocity zone, the influence of the length of the recirculation zone; low velocity zone gives the obstacle after the length of the recirculation zone The fitting formula provides some reference for the engineering application.

【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU834

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