基于CFD的风暖浴霸多翼离心风机蜗壳结构优化
Structure optimization of multi-wing centrifugal fan volutes for wind-warm bath heaters based on CFD
摘要：
以某型号的风暖浴霸内部的多翼离心风机整体结构为研究对象,利用Fluent对原型风机进行了模拟分析和结构优化,结果显示模拟结果与实测误差在5%以内,验证了采用CFD数值模拟方法优化多翼离心风机的可靠性。在上述研究基础上,设计了不同蜗壳宽度与轴向尺寸的模拟优化和实验测试方案,根据数值模拟结果分析了各方案的风机内部流动和气动性能,确定了最优蜗壳宽度为84 mm和最优尺寸组合为顶部间隙3 mm、底部间隙11 mm。数值模拟结果表明优化后的风机内部流场的速度明显提升。测试结果显示优化后的风机在设计工况下出口风量提升5.88%、全压效率提升7.91%,综合性能有所提升,为同类浴霸的结构优化和性能评价提供了明确的方法。
Abstract：
Taking the overall structure of a multi-wing centrifugal fan inside a certain model of wind-warm bath heater as the research object, the simulation analysis and structure optimization of the prototype fan are carried out by using Fluent, and the results show that the error between the simulation result and the measured result is within 5%, which verifies the reliability of CFD numerical simulation method to optimize the multi-wing centrifugal fan. On the basis of the above research, the simulation optimization and experimental test schemes with different volute widths and axial dimensions are designed. Based on the numerical simulation results, the internal flow and aerodynamic performance of each scheme is analysed. The optimal volute width is determined to be 84 mm, and the optimal size combination is a top clearance of 3 mm and a bottom clearance of 11 mm. The numerical simulation results show that the flow velocity of the internal flow field of the optimized fan is significantly increased. The test results show that the optimized fan has a 5.88% increase in outlet air volume and a 7.91% increase in total pressure efficiency under design conditions, and the comprehensive performance is improved, providing a clear method for structural optimization and performance evaluation of similar bath heaters.
Keywords:bath heater; multi-wing centrifugal fan; volute width; axial dimension; CFD numerical simulation; structural optimization; performance test