Laser metal deposition of bionic aluminum supports: reduction of the energy input for additive manufacturing of a fuselage

Additively manufactured components made of metallic material are subject to special consideration for many R&D departments, since the process control is not yet sufficiently reliable and therefore an extensive quality assurance is necessary. For this reason, few structural components for aviation have been established so far. In this paper, a feasibility study for the use of laser metal deposition (LMD) for the additive manufacturing of a fuselage made of aluminum is carried out. The result is a parameter set with a minimized energy input. However, due to a welding length of 58 m the overall energy input is high and large distortion arises

Experimental Verification of Heat-Flux Mitigation by Electromagnetic Fields in Partially-Ionized-Argon Flows

This paper describes an experimental study on heat-flux mitigation within high-enthalpy ionized-argon flows by application of an external magnetic-induction field. Two different axially symmetric test models containing water-cooled magnet coils have been investigated. The models have been made of a material with low thermal conductivity to visualize surface-temperature distribution.The latter has been measured by infrared thermography. Heat-flux rates have been derived from measured front- and rear-surface temperatures, taking into account temperature-dependent material characteristics and considering radiative-cooling exchange to the environment. Flowfield properties have been quantitatively characterized by laser-induced fluorescence, microwave interferometry, emission spectroscopy, electrostatic probes, and pitot probes. In addition, high-quality video recordings and photographs have been taken for shock-layer visualization. Remarkable measured surface-temperature reductions (16 and 44%) and derived heat-flux mitigations (46 and 85%) have been observed in the presence of an externally applied magnetic-induction field

An Experimental Study on Heat-Flux Reduction by Electromagnetic Fields in Ionized Flows

In the frame of this work an experimental study has been performed on heat-flux mitigation within high-enthalpy ionized-argon flows by application of an external magnetic-induction field. Two different axially symmetric test models, containing water-cooled magnet coils, were investigated. The models were made of a material with low thermal conductivity, in order to visualize surface-temperature distribution. The latter has been measured by infrared thermography. Heat-flux rates have been derived from measured front and rear surface temperature taking into account temperature-dependent material characteristics and considering radiative-cooling exchange to the environment. Flow-field properties have been quantitatively characterized by laser induced fluorescence, microwave interferometry, diode laser absorption spectroscopy, electrostatic probes and Pitot probes. Remarkable measured surface-temperature reductions up to 44%, and derived heat-flux mitigation up to 85%, have been observed in the presence of an externally applied magnetic-induction field. The influence of change in the polarity of the electromagnetic coils has also been measured and showed in contrast to some former studies comparable effects for both polarities