本文選題：離心通風機 + 核電站　； 參考：《內蒙古工業(yè)大學》2017年碩士論文

【摘要】：離心通風機是一種重要的流體機械,是日常生產、生活中必不可少的一種通風設備。在核電站中,用于安全殼內大氣通風系統(tǒng)的離心通風機主要依靠于進口,并且風機的效率比較低。核電站專用的離心通風機要做到高效、節(jié)能、國產化,對其進行開發(fā)研制勢在必行。主要運用離心通風機現代氣動設計方法,選用效率高、噪聲低的后向葉輪,根據核級風機的運行參數,初步設計核電專用離心通風機。對初始設計方案使用Gambit軟件進行建模、網格劃分、邊界條件設置,使用FLUENT軟件中的RNG k-epsilon湍流模型,SIMPLE算法,多重參考系(MRF)模型進行三維數值模擬。通過分析風機全壓、效率以及風機內部流場情況,分別通過修改風機葉片數目、葉片進口角、進口加速系數、葉片出口寬度與蝸殼寬度之比、葉片進出口寬度之比5個參數進行優(yōu)化。經過優(yōu)化后發(fā)現,當葉片數為16,葉片進口角為25°,進口加速系數為0.66,葉片出口寬度與蝸殼寬度之比為0.4,葉片進出口寬度之比為0.6時,離心通風機效率達到87.74%,全壓5328.6Pa,符合設計要求。將最優(yōu)方案進行樣機制作并進行樣機的性能測試,測試結果發(fā)現,在設計工況下,離心風機的效率可以達到87%以上,對比試驗與模擬結果,數值模擬與試驗結果符合較好,數值模擬計算結果的效率、全壓比實際測試結果略高,這主要是由于:(1)計算中將物理模型進行了簡化,與實際制作樣機有不同,計算結果與實際測試有偏差;(2)對計算模型劃分網格的精度不夠高,導致計算結果與實際情況有偏差。所設計的離心通風機效率、全壓符合實際中核電站大氣安全殼內通風系統(tǒng)的使用要求,效率有望達到一級能效,可以成為自主研發(fā)、自主制造的高效節(jié)能核級風機,對打破核級風機國外壟斷,實現國產化具有重要意義。
[Abstract]:Centrifugal ventilator is a kind of important fluid machinery, it is an essential ventilation equipment in daily production and daily life. In the nuclear power plant, the centrifugal ventilator used in the containment air ventilation system mainly depends on the import, and the efficiency of the fan is relatively low. In order to achieve high efficiency, energy saving and localization of special centrifugal fan for nuclear power plant, it is imperative to develop and develop it. This paper mainly uses the modern pneumatic design method of centrifugal fan, selects the backward impeller with high efficiency and low noise, and according to the operation parameters of nuclear grade fan, preliminarily designs the special centrifugal fan for nuclear power. The initial design scheme is modeled with Gambit software, gridding, boundary condition setting, using simple algorithm of RNG k-epsilon turbulence model in FLUENT software and multi-reference system MRF model for 3D numerical simulation. By analyzing the total pressure, efficiency and flow field of the fan, the ratio of blade number, blade inlet angle, inlet acceleration coefficient, blade outlet width to volute width is revised, respectively. The ratio of blade inlet and outlet width was optimized by 5 parameters. After optimization, it is found that when the number of blades is 16, the blade inlet angle is 25 擄, the inlet acceleration coefficient is 0.66, the ratio of blade outlet width to volute width is 0.4, and the ratio of blade inlet and outlet width is 0.6, the efficiency of centrifugal fan reaches 87.74 and the total pressure is 5328.6 Pa. it meets the design requirements. The optimal scheme is made and the performance of the prototype is tested. The results show that the efficiency of centrifugal fan can reach more than 87% under the design condition. Compared with the results of simulation, the results of numerical simulation and test are in good agreement with each other. The efficiency of the numerical simulation results is slightly higher than that of the actual test results. This is mainly due to the simplification of the physical model in the calculation, which is different from the actual prototype. The accuracy of meshing the calculation model is not high enough, which leads to the deviation between the calculation result and the actual situation. The designed centrifugal fan efficiency, full pressure conforms to the actual nuclear power plant atmosphere containment ventilation system use requirements, the efficiency is expected to reach first class energy efficiency, can become independent research and development, self-made high-efficiency energy-saving nuclear fan, It is of great significance to break the foreign monopoly of nuclear fan and realize the localization.
【學位授予單位】：內蒙古工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM623.4

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本文編號：1913290