Numerical study on startup behaviors of dense powder conveying in powder fueled ramjets using modified TFM incorporated with μ(I) rheology theory

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2024-11-23 DOI:10.1016/j.powtec.2024.120488

Shilin Gao, Haibin Zhang, Bofeng Bai

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引用次数: 0

Abstract

In-depth understandings of propellant conveying characteristics during startup stage are crucial for powder engine ignitions. A modified two-fluid model was presented for dense powder conveying in startup stage in this paper, in which the μ(I) rheology theory was implanted to replace kinetic theory of granular flow. New constructed model was employed to investigate the unsteady conveying characteristics, and three distinct sub-stages of dense powder conveying at startup stage and its competitive mechanisms were confirmed. In addition, the relative volatility was introduced to assess the effect of peak rate, and it was found that increases in the fluidizing gas pressure or the throat diameter were beneficial to the stability of conveying. This paper provides a new numerical approach for predicting the startup behaviors of dense powder conveying, and offers new insights into the dynamics of dense powder conveying and references for the development of reliable ignition technology in powder fueled ramjets.

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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.