【摘要】 针对某前弯式离心风机蜗壳提出一种控制周向截面积分布的优化设计方法.该方法将优化算法与数值模拟分析相结合,在仅改变蜗壳型线的前提下,以控制蜗壳型线的四个结构参数为优化变量,以效率不减、风机全压最大为优化目标。通过对比原型风机的数值与试验结果,验证数值计算的可靠性.优化前后的结果表明,合理的蜗壳周向截面积分布方式能明显改善风机性能.优化后蜗壳改善了风机叶轮出口处的流场结构,增加了该处的气流速度并减小了气流角,最终使得风机全压提升45 Pa,风机效率提高1.15%.更多还原

【Abstract】 This paper took a forward-curved blades centrifugal fan as the research object. A numerical optimization design method was proposed to control the distribution of circumferential cross-sectional area. Under the premise of only changing volute, this method combines the optimization algorithm and numerical simulation in order to achieve maximum total pressure by controlling the four design parameters of the volute profile. The reliability of the numerical calculation was verified by comparing the test data of the prototype fan. The results before and after optimization show that the reasonable distribution of circumferential cross-sectional area has a great influence on the performance of the volute. The optimized volute improves the flow condition, increases the airflow velocity and reduces the airflow angle at the outlet of the fan impeller. Finally, the fan total pressure is increased by 50 Pa, the total efficiency is increased by 1.15%.更多还原