单级离心风机气动性能模拟与实验验证

发布时间：2018-04-18 19:20

本文选题：离心风机 + 数值模拟　；参考：《哈尔滨工程大学》2013年硕士论文

【摘要】：离心风机是一种重要的流体机械，是日常生产、生活中必不可少的一种通风设备。如何提高风机效率、扩大其工况范围也是节能减排的重要研究方向之一。本文将通过数值仿真计算的方法，离心风机的气动性能进行模拟和研究，以提高其工作效率，为新型离心风机的研发提供参考。本文主要以9-26-14.5D单级离心风机为研究对象，利用Pro/ENGINEER Wildfire5.0软件进行建模，采用Gambit软件划分网格，使用FLUENT13.0件进行数值仿真计算并与实验测量数值进行对比，，找出适合的数值模拟方法。在掌握合理的数值模拟方法基础上，对风机叶片进行优化设计，并对改进后的风机重新进行数值模拟计算和实验验证。利用现有实验平台对离心风机进行性能测试，针对离心风机轴功率无法直接测得的问题，通过测得电机工作电流及电压来间接计算出风机的轴功率，并获得离心风机的工作特性曲线。根据离心风机内部流动情况，对离心风机进行若干工况的数值模拟，较全面的了解离心风机流量改变对其性能参数的影响。以提高离心风机效率为目的对风机叶片进行优化，虽然优化后数值仿真与实验结果仍有一定的偏差，但改进前后的压力、流量、功率等变化趋势相同。对不同离心风机叶轮进口侧盖板的不平整情况进行了数值仿真模拟与分析。当叶轮进口侧盖板有凹陷时，对离心风机性能影响较大，不平整的位置越靠近叶轮出口，风机的效率下降的越多，当不平整位置靠近叶轮进口时，反而有可能使风机的流量与出口压力有一定提升，但效率还是会下降。对于离心风机叶轮进口侧盖板凸出的情况，在位置和不平整情况基本相同时，凸出情况对离心风机性能的影响要远小于凹陷情况。
[Abstract]:Centrifugal fan is an important fluid machinery, it is a necessary ventilation equipment in daily production and daily life.How to improve fan efficiency and expand its operating range is also one of the important research directions of energy saving and emission reduction.In this paper, the aerodynamic performance of centrifugal fan is simulated and studied by the method of numerical simulation, in order to improve its working efficiency and provide reference for the research and development of new centrifugal fan.This paper mainly takes 9-26-14.5D single-stage centrifugal fan as the research object, uses Pro/ENGINEER Wildfire5.0 software to model, uses Gambit software to divide the grid, uses FLUENT13.0 to carry on the numerical simulation calculation and compares with the experimental measurement value, and finds out the suitable numerical simulation method.On the basis of the reasonable numerical simulation method, the optimal design of the fan blade is carried out, and the improved fan is simulated again and verified by experiments.The performance of centrifugal fan is tested by using the existing experimental platform. Aiming at the problem that the shaft power of centrifugal fan can not be measured directly, the shaft power of fan is calculated indirectly by measuring the working current and voltage of the motor.The working characteristic curve of centrifugal fan is obtained.According to the internal flow situation of centrifugal fan, the numerical simulation of centrifugal fan under several working conditions is carried out, and the influence of flow rate change of centrifugal fan on its performance parameters is fully understood.In order to improve the efficiency of centrifugal fan, although there is still some deviation between the numerical simulation and the experimental results, the change trend of pressure, flow rate and power before and after the improvement is the same.The unevenness of the inlet side cover plate of different centrifugal fan impellers is simulated and analyzed numerically.When the inlet side cover plate of impeller has depression, the performance of centrifugal fan is greatly affected. The more unleveled position is near the impeller outlet, the more the efficiency of fan decreases, and when the unleveled position is near the impeller inlet,On the contrary, it is possible to increase the flow rate and outlet pressure of the fan, but the efficiency will decrease.When the position and unevenness are basically the same, the effect of protruding on the performance of centrifugal fan is much smaller than that of sag.
【学位授予单位】：哈尔滨工程大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TH432

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