在日常生活和工业领域中,风机是一种十分常见且应用广泛的机械设备。其主要功能是提供通风量和气力压差以实现除尘、散热、通风以及气力输送等。离心风机是一种典型的具有动静器件的透平式流体机械,气动噪声伴随着离心风机做功过程产生,确保高压离心风机在做功过程中同时保持良好声品质是国内外相关领域学者共同关注的热门研究方向之一。高压离心风机的局部流场有哪几种?

In daily life and industrial fields, fan is a very common and widely used mechanical equipment. Its main function is to provide ventilation and pneumatic pressure difference to realize dust removal, heat dissipation, ventilation and pneumatic conveying. Centrifugal fan is a typical turbine fluid machinery with dynamic and static components. Aerodynamic noise is generated with the work process of centrifugal fan. Ensuring that high-pressure centrifugal fan maintains good sound quality during the work process is one of the hot research directions of scholars in relevant fields at home and abroad. What are the local flow fields of high-pressure centrifugal fan?

1、二次流高压

1. Secondary flow high pressure

离心风机二次流是风机内部一种不良流场状态,叶片与叶片之间流道由前叶背面吸力区和后叶片前面挤压区组成,风机的叶片间隙与转速设计不协调会导致气流的挤压与填补局部真空的过程与叶片旋转不匹配,两股气流在局部形成二次流。还有一些是因为其叶片转速下叶片间隙流道压力区作用为主,形成叶片前端速度高压力大的结果。因此合理的叶片设计与转速匹配对于风机做功是十分重要的,因此减少二次流的产生是提高风机效率的更好方法。

The secondary flow of centrifugal fan is a bad flow field state inside the fan. The flow channel between blades is composed of the suction area on the back of the front blade and the extrusion area in front of the rear blade. The disharmony between the blade clearance and speed design of the fan will lead to the mismatch between the extrusion of air flow and the filling of local vacuum and the rotation of blades, and the two air flows form secondary flow locally. Others are mainly due to the effect of the pressure zone in the blade clearance channel under the blade speed, resulting in high speed and high pressure at the front end of the blade. Therefore, reasonable blade design and speed matching are very important for the work of the fan. Therefore, reducing the generation of secondary flow is a better way to improve the efficiency of the fan.

2、间隙流在气流

2. Gap flow in air flow

从集流器进入叶轮流道时,由于叶轮与蜗壳边界存在一定间隙,部分气流钻进狭长间隙,在叶轮和蜗壳之间形成局部回流。间隙流质流速迅速降低滞留在间隙里,出口与叶轮蜗壳主流道汇合形成循环回流。间隙流可以理解为主流道分流到狭窄支流道造成压力损失,这也是风机内流场一种不健康的状态。叶轮与蜗壳之间有一大圈循环流,这种不规则的流动现象进一步增加了蜗壳和叶片的压力脉动,对风机气动噪声有一定影响。

When entering the impeller channel from the collector, due to a certain gap between the impeller and the volute boundary, part of the air flow enters the narrow gap, forming a local backflow between the impeller and the volute. The flow velocity of the fluid in the gap decreases rapidly and remains in the gap. The outlet meets with the main flow channel of the impeller volute to form a circulating reflux. The gap flow can be understood as the pressure loss caused by the diversion of the main channel to the narrow tributary, which is also an unhealthy state of the flow field in the fan. There is a large circle of circulating flow between the impeller and the volute. This irregular flow phenomenon further increases the pressure pulsation of the volute and blade, which has a certain impact on the aerodynamic noise of the fan.

在车辆领域,高压离心风机多应用于道路清扫车,这是一种新型城市环保环卫车辆。这种车型之前由国外团队研发,集成了道路垃圾清扫、收集与运输等功能,大大提高了保洁效率,节省了人力成本,且能更好的控制城市道路污染。经过引进消化吸收创新,该类车型已成为部分大中城市环卫保洁的主要设备。

In the field of vehicles, high-pressure centrifugal fans are mostly used in road sweepers, which is a new type of urban environmental protection and sanitation vehicle. Previously developed by foreign teams, this model integrates the functions of road garbage cleaning, collection and transportation, greatly improves the cleaning efficiency, saves labor costs, and can better control urban road pollution. After introduction, digestion, absorption and innovation, this type of vehicle has become the main equipment for environmental sanitation in some large and medium-sized cities.

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The above is the detailed introduction of Shaanxi centrifugal fan manufacturers. I hope it will be helpful to you If you have any questions, please contact us We will provide you with professional service http://www.sdyqtc.com

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