速凍隧道流場模擬及隧道的優(yōu)化設(shè)計
[Abstract]:Since 1980 s, the frozen food industry in China has developed rapidly, and the variety and quantity are increasing day by day. When frozen food is cooled in the cooling tunnel, it is greatly affected by wind speed and air volume. Unreasonable setting will lead to moisture drying, sublimation, skin rupture and other defects on the surface of frozen food. The cooling tunnel structure affects the uniformity of flow field. Reasonable tunnel structure can reduce the temperature difference between the inner and outer sides of the conveyor belt, improve the cooling efficiency and reduce the energy consumption. The numerical simulation of cooling tunnel can predict the cooling effect of food, optimize the technological conditions such as wind speed and air volume, the position of fan, the size of baffle plate and so on, so as to save the operation cost and improve the quality of frozen products. In this paper, FLUENT software is used to simulate the cooling tunnel of a quick freezing device, and the variation of velocity field and temperature field with air supply velocity in cooling tunnel is analyzed, and the optimum air supply speed is determined according to the change of temperature difference. Under the condition of reasonable air supply speed, the baffle plate is added to further simulate and analyze the effect of cooling tunnel structure on the improvement of cooling efficiency. Through the research in this paper, it is found that: (1) when the air supply speed is increased from 12m/s to 13 m / s, the region range of the lower velocity in the velocity field decreases and the uniformity of the velocity field is improved when the air supply speed is increased from 13 m / s to 13 m / s; When the air supply speed increases from 14m/s to 15m/s, the distribution of velocity field does not change obviously. (2) when the air supply speed increases from 12m/s to 13 m, 14 m / s, 15 m / s, the maximum temperature in the temperature field decreases. The range of low temperature region is expanded, and the uniformity of temperature field is also improved. (3) on the basis of considering the principle of full utilization of cooling capacity and energy saving, the comprehensive analysis of velocity field and temperature field can be obtained. When the air supply speed of the chiller is 14m/s, it is more reasonable. (4) under the premise that the air supply speed is 14m/s, the range of the lower velocity in the velocity field is reduced when the baffle is added; The range of temperature field in the low temperature region decreases, and the temperature difference between the upper and outer sides of the conveyor belt decreases. The results show that the air supply speed of cooling tunnel is better than that of 14m/s, and the distribution uniformity of air flow field and temperature field can be further improved by adding baffle plate.
【學位授予單位】:鄭州大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TS205
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