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为探求某机车用轴流式风机的系统性能,对不同工况下带有前后导叶的该风机内部流场进行了数值仿真.模拟结果表明,在叶片转速不变情况下,随着气体流量的增加,叶片的气动压力增加,功率增大,风机的效率也随之提高;在气体流量保持不变时,随着叶片转速的增加,叶片的气动压力增加,功率增大;当风机出口存在阻力时,则叶片的气动压力增加,功率也增大.研究还表明,叶片两侧的最大气压差可达10 500 Pa以上,高速旋转时对叶片有一定危害.计算结果与试验测试结果的对比表明,二者吻合较好.
In order to explore the system performance of an axial fan for a locomotive, the numerical simulation of the internal flow field of the fan with front and rear guide vanes under different operating conditions is carried out. The simulation results show that with the constant rotor speed, , The aerodynamic pressure of the blade increases, the power increases, and the efficiency of the fan also increases. When the gas flow rate remains constant, the aerodynamic pressure of the blade increases and the power increases as the rotational speed of the blade increases. When the exit of the fan exists Resistance, the aerodynamic pressure of the blade is increased and the power is also increased.The study also shows that the maximum pressure difference between the two sides of the blade can reach more than 10 500 Pa, which is harmful to the blade during high-speed rotation.Comparison between the calculated result and the test result Show that the two agree well.