Calculation and design of supersonic nozzles for cold gas dynamic spraying using MATLAB and ANSYS Fluent.

摘要

One of the most daunting challenges in the Cold Gas Dynamic Spray (CGDS)udprocess is the calculation and design of the nozzles that are used to accel-uderate the gas and the powder particles at supersonic speeds and so promoteudthe deposition process. Past research into this area resulted in a wealth ofudknowledge but unresolved problems still exist. The actual calculations and de-udsigns of the CGDS nozzles are considered large, complex, and time consuming.udConsequently, this dissertation develops a new software that focuses on theudsimulation of the gas and particles velocities for a large variety of CGDS pro-udcess parameters. However, in order to achieve this, an unified mathematicaludmodel of various cold spray parameter was developed. Thereafter, a new soft-udware using MATLAB was developed to generate practical graphs for the CGDSudprocess and generate the 2D recommended nozzle contour, and the Compu-udtational Fluid Dynamics (CFD) software was used to calculate and visualizeudthe gas flow. Then, the results obtained using the two developed technologiesudwere compared with data from the peer reviewed journal papers and it wasudfound that the results obtain using the new MATLAB software and ANSYSudFluent were very similar with data found in the literature survey. The disser-udtation ends with conclusions about the new approach for the calculation anduddesign of the CGDS nozzles, and finally highlights its theoretical and practicaludimplications.