低压弯掠轴流风机改型设计与气动噪声预测-流体机械及工程专业论文.docxVIP

华中科技大学硕士 学位论 华 中 科 技 大 学 硕 士 学 位 论 文 I II Abstract Along with the fan industry relevant national standard files came on stage, the efficiency and noise value of fans were limited. So retrofit the current fans which have low efficiency and high noise is urgent. In recent years, swept-curved blades were applied to the field of low pressure axial flow fan and achieved well energy saving and noise reduction effect. This paper aimed at the energy saving and noise reduction of the general T35 axial fan with low pressure in fan industry. Applying the swept-curved blades to the T35 fans by using numerical simulation combined with experimental study, and predict the aero-acoustic of the fan, which provided basis and references for the research of energy saving and noise reduction of axial fan with low pressure. This paper mainly done the following work: Firstly, carried out a series of performance test for the existed swept-curved axial flow fan by changing the blade installation angle, blade tip clearance and blowing type. Studied the influence of the fans’ performance with different installation structure, so as to provided basis for further optimization and matching application of the swept-curved axial flow fan. Done the modeling work of two sets T35 fans with low efficiency high aero-acoustic which were the same type but different size. Forecasted the performance of the original T35 fan and the existed swept-curved fan by numerical simulation, then compared to the experimental result to verify the reliability of the numerical simulation method. Secondly, combined with the given structure and performance parameters, put forward the variant design scheme of swept-curved blade, predict the total pressure performance and efficiency of the scheme, analyzed the internal flow field of the two schemes. Combined with energy efficiency standards and user’s requirements, selected the best modification design scheme. Considered the actual production and domestic demand, selected