无叶风扇及其内置微型风机设计与研究
发布时间：2018-07-29 07:12
【摘要】：无叶风扇由出风圈和微型风机组成,微型风机内置于无叶风扇内部,这使得无叶风扇变得更安全、更环保,目前无叶风扇的问题主要集中在风力和噪音上。其中传统无叶风扇出风圈内表面均设置成扩散面,结构单一,风力较小,因此设计研究新型出风圈内表面对继续创新无叶风扇结构具有指导意义。同时,微型风机在高速运转时噪音较大,因此设计低噪声风机对无叶风扇降噪具有重要意义。 本文提出了带收缩型出风内表面的无叶风扇结构,并依此为依据设计了两款无叶风扇。对小间隙无叶风扇模型进行数值计算,验证了收缩型内表面能够高效地实现风量放大作用。同时研究了收缩角和入口速度环量对小间隙无叶风扇性能的影响,为无叶风扇和内置风机设计提供了依据。 设计了配套的两级低速微型风机结构,取代单级高速风机。风机叶轮采用非均匀布置叶片,通过基于RANS+FW-H方法对不同叶片分布形式下风机气动声学特性分析,表明非等距叶片布置可以降低风机叶片通过频率处的噪声值,叶片分布不均匀度越大,对该频率噪声降低效果越明显；但不均匀度过大,会导致低频噪声声压级的大幅增加,叶片不均匀度存在一个最优区间。 对小间隙无叶风扇和两级风机样机进行实验研究,结果表明新型无叶风扇较传统无叶风扇性能和降噪效果都有了明显提高,同时将实验结果与模拟结果进行对比,验证了研究思路的可行性。 针对大出风间隙结构无叶风扇无法形成稳定射流的问题,通过格栅结构设置保证了大出风间隙条件下的均匀出风,数值模拟结果表明无叶风扇间隙越大,需要的格栅密度越大。而收缩角对大出风间隙结构的性能和风向也具有显著影响,夹角过大或过小都会使风向偏离中心位置。 本文给出了无叶风扇及其内置低噪声风机的设计方法,给出了带收缩型出风内表面的无叶风扇结构、无叶风扇专用低速两级风机结构、不等距风机叶片结构以及带格栅的大间隙出风结构,给出了关键结构参数对风扇性能与噪声指标的影响,设计的新型无叶风扇达到了设计目的,分析结果为新型无叶风扇的结构创新和产品开发提供了参考。
[Abstract]:The vaneless fan is composed of an outlet fan and a micro fan, which is built into the blade free fan, which makes the fan safer and more environmentally friendly. At present, the problems of the vaneless fan are mainly focused on the wind and noise. The inner surface of the traditional vaneless fan outlet ring is set as diffusion surface, the structure is single and the wind is small. Therefore, the design and study of the new type of inner surface of the exhaust fan is of guiding significance for the continuous innovation of the structure of the vaneless fan. At the same time, the noise of micro fan is high when running at high speed, so it is very important to design low noise fan for noiseless fan. In this paper, the structure of vaneless fan with constrictive inner surface of outlet air is presented, and two vaneless fans are designed according to the structure. The model of vaneless fan with small clearance is numerically calculated, and it is verified that the shrinking inner surface can efficiently realize the effect of air volume amplification. At the same time, the influence of shrinkage angle and inlet velocity ring on the performance of small clearance vaneless fan is studied, which provides the basis for the design of vaneless fan and built-in fan. A two-stage low-speed micro fan structure is designed to replace one-stage high-speed fan. Based on the RANS FW-H method, the aerodynamic acoustic characteristics of the fan with different blade distribution forms are analyzed. The results show that the non-equidistant blade arrangement can reduce the noise value of the fan blade passing through frequency. The greater the uneven distribution of the blade, the more obvious the effect of reducing the frequency noise, but the larger the inhomogeneity, the larger the sound pressure level of the low frequency noise will be, and there is an optimal range of the uneven degree of the blade. The experimental study on the small clearance vaneless fan and the two-stage fan prototype shows that the performance and noise reduction effect of the new type vaneless fan are obviously improved compared with the traditional vaneless fan, and the experimental results are compared with the simulation results. The feasibility of the research idea is verified. In view of the problem that the vaneless fan with large outlet gap structure can not form a stable jet, the uniform outlet air under the condition of large outlet air gap is ensured by the grid structure setting. The numerical simulation results show that the larger the fan clearance is, the greater the grid density is required. The shrinkage angle also has a significant effect on the performance and wind direction of the large outlet gap structure. Too large or too small an angle will cause the wind direction to deviate from the center. In this paper, the design method of the vaneless fan and its built-in low noise fan is given. The structure of the vaneless fan with the inner surface of the outlet wind and the structure of the low speed two-stage fan for the vaneless fan are given. The blade structure of non-equidistant fan and the large gap outlet structure with grid are given. The influence of key structural parameters on the performance and noise index of fan is given. The new type of vaneless fan is designed to achieve the purpose of the design. The results provide a reference for the structure innovation and product development of the new type vaneless fan.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM925.11
本文编号：2151914
[Abstract]:The vaneless fan is composed of an outlet fan and a micro fan, which is built into the blade free fan, which makes the fan safer and more environmentally friendly. At present, the problems of the vaneless fan are mainly focused on the wind and noise. The inner surface of the traditional vaneless fan outlet ring is set as diffusion surface, the structure is single and the wind is small. Therefore, the design and study of the new type of inner surface of the exhaust fan is of guiding significance for the continuous innovation of the structure of the vaneless fan. At the same time, the noise of micro fan is high when running at high speed, so it is very important to design low noise fan for noiseless fan. In this paper, the structure of vaneless fan with constrictive inner surface of outlet air is presented, and two vaneless fans are designed according to the structure. The model of vaneless fan with small clearance is numerically calculated, and it is verified that the shrinking inner surface can efficiently realize the effect of air volume amplification. At the same time, the influence of shrinkage angle and inlet velocity ring on the performance of small clearance vaneless fan is studied, which provides the basis for the design of vaneless fan and built-in fan. A two-stage low-speed micro fan structure is designed to replace one-stage high-speed fan. Based on the RANS FW-H method, the aerodynamic acoustic characteristics of the fan with different blade distribution forms are analyzed. The results show that the non-equidistant blade arrangement can reduce the noise value of the fan blade passing through frequency. The greater the uneven distribution of the blade, the more obvious the effect of reducing the frequency noise, but the larger the inhomogeneity, the larger the sound pressure level of the low frequency noise will be, and there is an optimal range of the uneven degree of the blade. The experimental study on the small clearance vaneless fan and the two-stage fan prototype shows that the performance and noise reduction effect of the new type vaneless fan are obviously improved compared with the traditional vaneless fan, and the experimental results are compared with the simulation results. The feasibility of the research idea is verified. In view of the problem that the vaneless fan with large outlet gap structure can not form a stable jet, the uniform outlet air under the condition of large outlet air gap is ensured by the grid structure setting. The numerical simulation results show that the larger the fan clearance is, the greater the grid density is required. The shrinkage angle also has a significant effect on the performance and wind direction of the large outlet gap structure. Too large or too small an angle will cause the wind direction to deviate from the center. In this paper, the design method of the vaneless fan and its built-in low noise fan is given. The structure of the vaneless fan with the inner surface of the outlet wind and the structure of the low speed two-stage fan for the vaneless fan are given. The blade structure of non-equidistant fan and the large gap outlet structure with grid are given. The influence of key structural parameters on the performance and noise index of fan is given. The new type of vaneless fan is designed to achieve the purpose of the design. The results provide a reference for the structure innovation and product development of the new type vaneless fan.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM925.11
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