Experimental study on the agglomeration of fire smoke by flow-sound-separation Hartmann whistle with swirl characteristics

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL Powder Technology Pub Date : 2025-04-30 Epub Date: 2025-02-24 DOI:10.1016/j.powtec.2025.120835

Weihua Li, Guangxue Zhang, Shu Liu, Sirui Tong, Dingkun Yuan, Yunchao Li, Hailin Gu, Jiangrong Xu

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Abstract

Acoustic air-jet generators show great potential in eliminating fire smokes. In this paper, to enhance the agglomeration performance and minimize the negative impact of exhaust airflow, a novel Hartmann whistle structure with swirl characteristics is designed. Experimental results indicate that the swirl blades have minimal effect on the fundamental frequency but reduce the sound amplitude as the blade size increases. When the blade height exceeds a certain size, the sound amplitude significantly drops. Compared to the structure without blades, the blades at the nozzle increase agglomeration efficiency by 24.5 % - 44.2 %, while the blades at the horn throat increase it by 21.4 % - 31.2 %. Overall, the agglomeration effect of the sound source with swirl blades decreases as the side opening sizes increase. In contrast, the sound source without blades shows a trend of first increasing and then decreasing, reaching the maximum at the flow-sound-separation point.

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具有旋流特性的流声分离哈特曼哨子对火灾烟气聚集的实验研究

声学喷气发生器在消除火灾烟雾方面显示出巨大的潜力。为了提高汽笛的团聚性能，减小排气对汽笛的负面影响，设计了一种具有旋流特性的新型哈特曼汽笛结构。实验结果表明，随着叶片尺寸的增大，旋流叶片对声源基频的影响较小，但对声源声幅值的影响较小。当叶片高度超过一定尺寸时，声幅值明显下降。与无叶片结构相比，喷嘴处的叶片可提高团聚效率24.5% ~ 44.2%，角喉处的叶片可提高团聚效率21.4% ~ 31.2%。总体而言，旋涡叶片声源的集聚效应随着侧开度的增大而减小。而无叶片的声源则呈现先增大后减小的趋势，在流声分离点处达到最大值。

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.