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Numerical Simulation and Research on Gas-solid Two-phase Flow Behavior in High Velocity Oxygen Fuel Thermal Spray

Author: ZhangJianPing
Tutor: ZhangXiangLinï¼›WangAiHua
School: Huazhong University of Science and Technology
Course: Materials Processing Engineering
Keywords: Gas-solid flow Non-premixed combustion FLUENT numerical simulation HVOF spray
CLC: TG174.44
Type: Master's thesis
Year: 2009
Downloads: 138
Quote: 1
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Abstract


HVOF technology has been able to form a combination of high strength , low porosity of the coating, HVOF process is mainly due to the formation of high temperature and high combustion products through the Laval nozzle ejected compression and re-expansion reached supersonic , high temperature and high gas particles that carry the injected particles in a molten or semi- molten state, the impact to the substrate , forming an excellent coating performance . Therefore, the HVOF process gas - solid two-phase study becomes particularly important. Domestic paper mainly uses ANSYS CFX or FLUENT model conversion reactions of substances HVOF process simulation analysis, this paper established in Gambit software HVOF process model , the first reaction of the combustion process to analyze PrePDF calculated using the FLUENT software HVOF simulate the entire process in the post- processing of the simulation results analysis. In this paper, the basic theory of two-phase flow and transport equations, HVOF process of establishing a gaseous flow mathematical model to calculate the FLUENT software platform, using k-? Turbulence model to simulate turbulent flow , the use of non-premixed combustion reaction process model settings to simulate HVOF process gaseous flow field characteristics of HVOF combustion process , burning material content than the gun structure parameters on gaseous flow field , analyzing the shock and mach cone generation mechanism ; then the discrete phase model of particle tracking random orbital dynamics model flight behavior of spray particles to study particle size and particle injection speed on the dynamic behavior of particles , and the results were compared with the relevant literature , after the coating process parameters for the selection and FLUENT simulation is widely used in the spray to provide useful information, and finally using the test method of the molten particles and particle impact flattening process , indicating that the WC-17Co sprayed on steel substrates by spraying distance Cr12 best of 342mm .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection > Metal surface protection technology > Metal complex layer of protection
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