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高壓離心風機的局部流場有哪幾種?

文章來源: 作者:羅茨機電 發布時間:2022-04-08 瀏覽次數:558

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在日常生活和工業領域中,風機是一種十分常見且應用廣泛的機械設備。其主要功能是提供通風量和氣力壓差以實現除塵、散熱、通風以及氣力輸送等。離心風機是一種典型的具有動靜器件的透平式流體機械,氣動噪聲伴隨著離心風機做功過程產生,確保高壓離心風機在做功過程中同時保持良好聲品質是國內外相關領域學者共同關注的熱門研究方向之一。高壓離心風機的局部流場有哪幾種?

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、二次流高壓

1. Secondary flow high pressure

離心風機二次流是風機內部一種不良流場狀態,葉片與葉片之間流道由前葉背面吸力區和后葉片前面擠壓區組成,風機的葉片間隙與轉速設計不協調會導致氣流的擠壓與填補局部真空的過程與葉片旋轉不匹配,兩股氣流在局部形成二次流。還有一些是因為其葉片轉速下葉片間隙流道壓力區作用為主,形成葉片前端速度高壓力大的結果。因此合理的葉片設計與轉速匹配對于風機做功是十分重要的,因此減少二次流的產生是提高風機效率的更好方法。

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.

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2、間隙流在氣流

2. Gap flow in air flow

從集流器進入葉輪流道時,由于葉輪與蝸殼邊界存在一定間隙,部分氣流鉆進狹長間隙,在葉輪和蝸殼之間形成局部回流。間隙流質流速迅速降低滯留在間隙里,出口與葉輪蝸殼主流道匯合形成循環回流。間隙流可以理解為主流道分流到狹窄支流道造成壓力損失,這也是風機內流場一種不健康的狀態。葉輪與蝸殼之間有一大圈循環流,這種不規則的流動現象進一步增加了蝸殼和葉片的壓力脈動,對風機氣動噪聲有一定影響。

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.

在車輛領域,高壓離心風機多應用于道路清掃車,這是一種新型城市環保環衛車輛。這種車型之前由國外團隊研發,集成了道路垃圾清掃、收集與運輸等功能,大大提高了保潔效率,節省了人力成本,且能更好的控制城市道路污染。經過引進消化吸收創新,該類車型已成為部分大中城市環衛保潔的主要設備。

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.

以上就是為大家介紹的有關陜西離心式風機廠家的詳細介紹,希望對您有所幫助.如果您有什么疑問的話,歡迎聯系我們.我們將以專業的態度,為您提供服務http://www.makemoore.com

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.makemoore.com


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