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After the guide vanes with axial fan Numerical simulation of flow characteristics

Lateral flow to the suction side, resulting in the leakage of tip clearance flow, thereby undermining the mainstream flow,[link widoczny dla zalogowanych], and have a greater flow loss. Formed in the flow channel adjacent blades, the blade tip area there is a big pressure, will result in the generation of secondary flow. Figure 7 (b) total pressure for the impeller exit section of the map, located in the tip, leaf area at the root of the same height and the total pressure is lower than the central position of the lower total pressure, which is due at the end wall boundary layer of thick and there is a big wake the loss of reason, which is 2.1 in the direction of the trail along the blade height loss decreases and then increases the same conclusion. News axial impeller in Figure 5, surface pressure distribution in Figure 6,[link widoczny dla zalogowanych], the impeller exit flow characteristics of stream surface diagram of the axial total pressure / Pa bi 1642.86-1357.14r] 1071. Bow j785.714500214.286-71.4286 -357.143 fight a - b} the total pressure, Pa (a) axial flow surface between the total pressure (b) a 1:3 stream surface impeller total pressure axial flow Figure 7 surface pressure distribution of the total coffee coffee coffee Shan Shan. Shan 32211_ file joint exclusion of Joseph Gou Rang pupae augmented whip trespass, j wow jj7 Second, paste - Pa 『_ _ _ ■ The stack of one hundred and eleven of a spike hide lr ■ ● Thermal Power Engineering, 2009 Figure 2.3 Comparison of the performance curve 8 and 9 is the fan total pressure and efficiency characteristic curves of the experimental and simulation results were compared. The figure shows that both are in good agreement, indicating that numerical results can reflect the overall operating performance of the fan. A point in the near design condition, the two closest relative error were 2.6% and 0.7%. Decrease or increase with the flow,[link widoczny dla zalogowanych], the relative error has increased, to simulate the flow within the average relative error of 5.8% and 1.6%,[link widoczny dla zalogowanych], verified the reliability of the numerical simulation. ∞, Q / m ・ s Figure 8, a total pressure of a flow curve 3 Conclusion Q/m8 ~ Figure 9 the efficiency of a flow curve using Fluent software, with a blade after the adjustable guide vane in the radial and axial flow fan Axial flow characteristics of flow characteristics of the inner surface of the numerical simulation and analysis. The results show that: (1) fan total pressure increases along the radial direction; total pressure at the pressure side to the rear from the front edge of an increasing trend, there is high pressure zone tail; suction surface at the existence of a reverse pressure gradient; total pressure at the posterior margin significantly lower total pressure loss along the radial first decreased and then increased. (2) deviate from the design condition, the leaf area produced after the top edge of the vortex, resulting in some fluid beginning to return, with the recirculation flow rate decreases further. (3) from the impeller inlet to the cascade of imports, static pressure and total pressure remained unchanged, while the dynamic pressure gradually increased; into the cascade flow, the static and total pressure increased linearly, while little change in dynamic pressure ; left after the cascade flow, static pressure, dynamic pressure and total pressure tends to remain unchanged. (4) Numerical simulation of pressure from fans and efficiency of the whole curve in good agreement with the experimental results, the simulation results can reflect the overall operating performance of the fan. References: [1] Li Jianfeng, Jun-Fu Lu. Numerical simulation of wind turbine [J]. Fluid Machinery, 2OO6, 34 (4): 1O-l3. [2] Wang Jun, Jin Peigeng, WU Guang-hui, et al. Axial fan air-conditioning system with Flow Analysis and Applications [J]. Engineering Thermophysics, 2OO2, 23 (3) :305-308. [3] Gu Hui-Fang, Gu Ping Road, Zhang Xi. CFD-based Axial fan, air-conditioning flow field [J]. Fluid Machinery, 2OO7, 35 (11) :29-33. [4] Tian Bin, Xi Deke, Xu Yanfei. Axial Fan Numerical study of the flow field [J]. Fan Technology, 2004 (3) :10-14. [5] Li Yang, Ouyang Hua, Zhao-Hui Du. Low-pressure axial fan circumferential curved tip leakage flow numerical study [J]. Engineering Thermophysics, 2005,[link widoczny dla zalogowanych],26 (2) 240-242. [6] Li Yang, Ouyang Hua, Zhao-Hui Du. Week Low Pressure Axial Fan Curved Blade Tip Clearance Flow in the numerical simulation [J]. Power Engineering, 2OO6, 26 (5) :707-711. [7] Li Yang, Ouyang Hua, Zhao-Hui Du. Leaves the same conditions on different circumferential bending properties of low-pressure axial fans comparative analysis [J]. Shanghai Jiaotong University, 2006,4 o (12) :2101-2105. [8] Solow Mahuo Wa TC. Sketches and fan aerodynamic performance curves [M]. jE Beijing: Coal Industry Press. 1986. [9] B. Ecker Fan [M]. Beijing: Mechanical Industry Press, 1983. (Edit Wei) ◆ used development, one by one the mention of a fir Butterfly ~ a ~ one by one ~ one hundred and eleven. Xie one by one ~ ~ ~ ~ one thousand one hundred eleven one hundred and eleven one hundred and eleven Butterfly ~ ~. Si only at points in January to section off the body must possess and the 9. One thousand one hundred and eleven ~ ~ ~ ~ one-way section of a side hope Solutions ◆
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