Computer model to simulate the random behaviour of particles in a thermal-spray jet

Zhang, T.; Bao, Y.; Gawne, D. T.; Liu, B.; Karwattzki, J.

doi:10.1016/j.surfcoat.2006.08.108

Cited by 13 publications

(4 citation statements)

References 5 publications

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“…To reduce energy losses, the high-speed jet of combustion products is additionally heated by the combustion products of the secondary air-combustible gas mixture in a cascade nozzle. Compressed air is also used to cool heat-loaded elements [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21].…”

Section: Resultsmentioning

confidence: 99%

Application of high-speed gas-flame technology for hardening the surfaces of machines and robots of automatic gas-flame spraying

Bazarbekov

2021

phst

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The article discusses the main types of installations (HVOF / HVAF (High Velocity Oxy / Air-Fuel), the Russian analogue of which is HPS/SGV (gas-flame supersonic/supersonic gas-air, activated arc metallization ADM devices) and the use of high-speed gas-flame technology for surface hardening for machine parts. Here we considered all types of flame treatment (welding, oxyfuel cutting, brazing, surface hardening, flame straightening, metallization, welding and spraying of non-metals), the performance of various methods of thermal spraying (GTN), and also considered the properties, methods of production and use of gases used in flame processing, modern equipment and equipment for all considered processes. The main task of the coating obtained by the method of flame spraying is also considered. It is shown that the deposition of coatings by the method of high-speed gas-flame spraying and effective materials for protection is promising. In addition, safety precautions for gas-flame processing are considered. The state is analyzed that the abrasive wear resistance of steel is a structurally sensitive characteristic, therefore, an effective wear-resistant material must have the ability to harden under the influence of working loads, during operation, and from this, materials are effective materials for protection under abrasive wear; corresponding to the principle of metastable austenite. The characteristics of a heterophase jet obtained under optimal spraying modes are estimated on the basis of a calculation using a mathematical model of a two-phase flow.

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Section: Resultsmentioning

confidence: 99%

Application of high-speed gas-flame technology for hardening the surfaces of machines and robots of automatic gas-flame spraying

Bazarbekov

2021

phst

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“…A model that has a similar/same dynamic characteristic compared to that of the spray system should be developed. In some cases, the model may be based on physical considerations by quantifying the relationship between the variables of the modeled system [6][7][8][9]. However, one does not have such a basic model to represent the system; it must be inferred from experiments performed on the same system.…”

Section: System Identificationmentioning

confidence: 99%

Estimating the behavior of particles sprayed by a single-cathode plasma torch based on a nonlinear autoregressive exogenous model

Liu¹,

Deng²,

Planche³

et al. 2015

Surface and Coatings Technology

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“…Numerical simulations on plasma spraying have been a topic of interest over the course of many years. Since the 1980s, the simulations have been extended from a single particle to multiple particles, to two and three dimensions in a single gas and in gas mixtures [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43]. The effect of a time-fluctuating plasma jet on the particle injection has been studied by Meillot [42].…”

Section: Introductionmentioning

confidence: 99%

Effect of a Spatially Fluctuating Heating of Particles in a Plasma Spray Process

Zhu

Baeva

Testrich

et al. 2022

Plasma Chem Plasma Process

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The work is concerned with the effect of a spatially fluctuating heating of Al2O3 particles with diameters of 5–120 μm during a plasma spray process. A plasma jet is generated in a mixture of Ar (40 NLPM) and H2 (14 NLPM) and in pure Ar at an electric current of 600 A. The tracing of the injected particles in the plume region of the plasma jets is considered in the framework of a three-dimensional model taking into account a turbulent fluid flow. It is shown that the heat source for the injected particles exhibits a well pronounced spatially fluctuating structure due to the enhancement of the thermal conductivity resulting from dissociation and ionization of the molecular gas in the temperature range of 2500–4000 K and 13,000–14,000 K, respectively. During their travel towards the substrate, the particles are therefore repeatedly heated in the gas mixture in contrast to the case of pure argon. Particles injected in the gas mixture reach the substrate with a higher average temperature and velocity.

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Computer model to simulate the random behaviour of particles in a thermal-spray jet

Cited by 13 publications

References 5 publications

Application of high-speed gas-flame technology for hardening the surfaces of machines and robots of automatic gas-flame spraying

Application of high-speed gas-flame technology for hardening the surfaces of machines and robots of automatic gas-flame spraying

Estimating the behavior of particles sprayed by a single-cathode plasma torch based on a nonlinear autoregressive exogenous model

Effect of a Spatially Fluctuating Heating of Particles in a Plasma Spray Process

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