本文選題：風(fēng)力機(jī)　切入點(diǎn)：直接空冷系統(tǒng)　出處：《華北電力大學(xué)(北京)》2016年碩士論文

【摘要】：在我國(guó)北方“富煤缺水多風(fēng)”地區(qū),風(fēng)力發(fā)電技術(shù)與直接空冷系統(tǒng)應(yīng)用十分廣泛。環(huán)境風(fēng)會(huì)顯著影響空冷凝汽器的換熱性能。空氣流過(guò)風(fēng)力機(jī)流速會(huì)降低,通過(guò)風(fēng)力機(jī)和空冷島耦合運(yùn)行,提高空冷島性能并減少?gòu)S用電率,實(shí)現(xiàn)能源的優(yōu)化利用。本文采用數(shù)值模擬的方法,研究了在空冷島外部布置風(fēng)力機(jī)對(duì)空冷凝汽器流動(dòng)傳熱性能的影響。首先,根據(jù)動(dòng)量葉素理論建立了三維實(shí)體風(fēng)力機(jī)模型,模擬驗(yàn)證了模型的可用性,并得到了風(fēng)力機(jī)在設(shè)計(jì)風(fēng)速時(shí)尾流流場(chǎng)的變化規(guī)律；建立了三維實(shí)體風(fēng)力機(jī)與空冷島耦合模型,在側(cè)面來(lái)風(fēng)、較大風(fēng)速情況下,選取固定高度4種不同間距的布置方案,對(duì)比分析了空冷島換熱量的變化規(guī)律,并結(jié)合空冷島周圍流線圖和溫度云圖,分析了“熱風(fēng)回流”和“倒灌”現(xiàn)象產(chǎn)生的原因。結(jié)果表明較近的布置有利于提高空冷島的質(zhì)量流量和換熱量,迎風(fēng)單元的性能有一定改善,但隨環(huán)境風(fēng)速增大,改善效果越來(lái)越不顯著；最后,使用致動(dòng)盤風(fēng)力機(jī)模型替代三維實(shí)體風(fēng)力機(jī),將風(fēng)力機(jī)簡(jiǎn)化為一個(gè)產(chǎn)生壓強(qiáng)差的平面,減小計(jì)算量,模擬了在側(cè)面來(lái)風(fēng)和正面來(lái)風(fēng)兩種風(fēng)向、較大風(fēng)速時(shí),風(fēng)力機(jī)布置2種不同高度布置對(duì)空冷島性能的影響。結(jié)果表明,較高的布置方案能降低空冷平臺(tái)上方環(huán)境風(fēng)速,減弱環(huán)境風(fēng)對(duì)空冷島出口空氣的壓制作用,削弱了熱風(fēng)回流現(xiàn)象。較低布置對(duì)迎風(fēng)單元換熱量提升有幫助,但整體改善效果不如較高布置。2種布置側(cè)面來(lái)風(fēng)比正面來(lái)風(fēng)時(shí)空冷島改善效果好。研究結(jié)果為進(jìn)一步優(yōu)化空冷島的換熱性能提供參考。
[Abstract]:The technology of wind power generation and direct air cooling system are widely used in the area of "rich coal, short water and more wind" in the north of China.The ambient wind will significantly affect the heat transfer performance of the air-cooled condenser.The velocity of air flowing through the wind turbine will decrease, and the performance of the air-cooled island can be improved by coupling the wind turbine with the air-cooled island, and the utilization of energy can be optimized.In this paper, the effect of wind turbine arrangement on the flow heat transfer performance of air-cooled condenser is studied by numerical simulation.Firstly, the three-dimensional solid wind turbine model is established according to the momentum and leaf element theory. The availability of the model is verified by simulation, and the variation law of the wake flow field of the wind turbine is obtained when the wind speed is designed.The coupling model of three-dimensional solid wind turbine and air-cooled island is established. Under the condition of side wind and large wind speed, four different arrangement schemes with fixed height are selected, and the variation law of heat transfer of air-cooled island is compared and analyzed.The causes of the phenomenon of "hot air return" and "inverted irrigation" are analyzed by combining the streamline diagram and temperature cloud chart around the air-cooled island.The results show that the near arrangement is beneficial to improve the mass flow and heat exchange of the air-cooled island, and the performance of the upwind unit is improved to some extent, but with the increase of the ambient wind speed, the improvement effect is less and less remarkable.Using the model of actuated disk wind turbine instead of three-dimensional solid wind turbine, the wind turbine is simplified as a plane that produces pressure difference, and the calculation is reduced, and the wind direction of side wind and front wind are simulated, and the wind speed is large.The effect of two different height arrangements on the performance of air-cooled islands.The results show that the higher arrangement scheme can reduce the ambient wind speed over the air-cooled platform, weaken the suppression of the ambient wind on the air cooling island outlet air, and weaken the hot air return phenomenon.The lower arrangement is helpful to the heat transfer of upwind units, but the overall improvement effect is not as good as that of the higher arrangement of .2 types of side wind than the positive wind to improve the space-time cold island.The results provide a reference for further optimization of heat transfer performance of air-cooled islands.
【學(xué)位授予單位】：華北電力大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TM614;TM621

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