Study of the behavior of dust particles in helium turbines considering the effects of particle deposition and resuspension

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL Powder Technology Pub Date : 2024-06-20 DOI:10.1016/j.powtec.2024.120030

Xiaozhong Wang , Qi Sun , Xiaoyong Yang , Yinhai Zhu , Peixue Jiang , Wei Peng

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Abstract

The deposition of graphite dust poses significant challenges to the helium turbines in high-temperature gas-cooled reactors. In this study, FLUENT, a Computational Fluid Dynamics (CFD) program was used with a discrete-phase model and a random-walk model to calculate the trajectories of particles (assumed spherical). Considering the interactions between particles and the wall as well as the resuspension effect of the fluid, a particle-deposition model was established and coupled to the flow-field calculations of blades with film cooling using user-defined functions. The influence of different deposition models, particle diameters, and blowing ratios on deposition were investigated. The results show rebounding and resuspending particles significantly affect the particle-deposition rate and its distribution. With increasing particle diameter, the deposition rate initially increases and then decreases. The influence of blowing ratio on deposition is complex; as the blowing ratio is increased, the deposition rate of small particles increases, while that of large particles decreases.

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考虑到颗粒沉积和再悬浮效应的氦气涡轮机中尘埃颗粒行为研究

石墨粉尘的沉积给高温气冷堆中的氦气涡轮机带来了巨大挑战。在这项研究中，计算流体动力学（CFD）程序 FLUENT 采用离散相位模型和随机行走模型来计算颗粒（假定为球形）的运动轨迹。考虑到颗粒与壁面之间的相互作用以及流体的再悬浮效应，建立了颗粒沉积模型，并使用用户自定义函数将其与薄膜冷却叶片的流场计算相结合。研究了不同沉积模型、颗粒直径和吹气比对沉积的影响。结果表明，反弹和再悬浮颗粒对颗粒沉积率及其分布有很大影响。随着颗粒直径的增大，沉积速率先增大后减小。吹气比对沉积的影响比较复杂；随着吹气比的增加，小颗粒的沉积率增加，而大颗粒的沉积率降低。

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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.