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Scheme three: study the heat when the wind speed of screw air compressor fan increases from 1m/s to 2m/s. Through the simulation results can get: air temperature compressor reduces obviously, meet the cooling demand.
Scheme four: study the heat when fan radius of the screw air compressor increased from 0.6 meters to 0.8 meters. the simulation results show that: the internal temperature of compressor air decreased obviously, meet the cooling demand.
Through the four simulations gets the following conclusions: cooling scheme and plan two to have a certain influence but not enough to meet the need of optimization. Scheme three and four meet the cooling demand, but taking into account the scheme three would increase the circuit burden and increase the cost. Scheme four is defined as the cooling scheme optimization when the screw air compressor is the quantity of heat.
This design need to use the UDF dynamic simulation of air compressor, heat dissipation design further optimization of screw air compressor. UDF is a user interface provided by the software of Fluent, users can communicate through internal data with the Fluent module, which can solve some of the standard Fluent module cannot solve the problem. Because the FLUENT software cannot simulate the dynamic heat value, required empirical formula of compressor heat by UDF, the heat source is more realistic, dynamic simulation of air compressor internal temperature field. The empirical formula of air compressor heat is written into the UDF, then the UDF import fluent to dynamic simulation. Through the dynamic simulation results, from the motor start heating to the maximum heat, hot air of screw air compressor internal start from the left side to the right to diffusion, and through the right side of the air outlet vents. Therefore, the dynamic simulation of screw air compressor, further optimization design of cooling scheme, increase the number of outlets in screw air compressor on the right.
TO determine the optimal design scheme, UDF simulation of the new scheme using the FLUENT software. The dynamic simulation that, the optimization scheme can better meet the cooling demand of internal screw air compressor, can greatly increase the safety of screw air compressor, so as to determine the scheme for the final design of screw air compressor cooling.
Keywords: screw air compressor; numerical simulation; heat; UDF; fluent
目录
1绪论 1
1.1 空压机散热的目的和意义 1
1.2计算流体力学的发展与研究现状 1
1.3 CFD软件Fluent简介及发展 2
1.3.1 Fluent软件介绍 2
1.3.2 Fluent在除尘设备中的应用[2] 3
1.3.3 Fluent在汽车工业中的应用[3] 4
1.3.4 Fluent的其它应用[1] 4
1.4空压机散热研究现状 6
2空压机及fluent的原理 7
2.1 空压机的分类及原理 7
2.1.1 螺杆式空压机 7
2.1.2滑片式空压机 7
2.1.3活塞式压缩机 7
2.1.4离心式压缩机 8
2.1.5涡旋机 8
2.2流体动力学控制方程 8
2.3gambit建模过程 9
3 热量最大时空压机散热模拟 10
3.1工程概况 10
3.2螺杆空压机原始散热状况模拟 10
3.2.1空压机模型建立 10
3.2.2网格划分 11
3.2.3 散热模拟 12
3.3 增加螺杆空压机散热孔数量的散热模拟 14
3.3.1 增加开孔数量的螺杆空压机模型建立 14
3.3.2 散热模拟 14
3.4 增大螺杆空压机开口尺寸的散热模拟 16
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