Experimental Study of Particle Deposition on Surface at Different Mainstream Velocity and Temperature

Fei Zhang, Zhenxia Liu, Zhengang Liu and Yanan Liu
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Fei Zhang: School of Power and Energy, Northwestern Polytechnical University, Xi’an 710129, China
Zhenxia Liu: School of Power and Energy, Northwestern Polytechnical University, Xi’an 710129, China
Zhengang Liu: School of Power and Energy, Northwestern Polytechnical University, Xi’an 710129, China
Yanan Liu: School of Power and Energy, Northwestern Polytechnical University, Xi’an 710129, China

Energies, 2019, vol. 12, issue 4, 1-18

Abstract: The effect of mainstream velocity and mainstream temperature on the behavior of deposition on a flat plate surface has been investigated experimentally. Molten wax particles were injected to generate particle deposition in a two-phase flow wind tunnel. Tests indicated that deposition occurs mainly at the leading edge and the middle and backward portions of the windward side. The mass of deposition at the leading edge was far more than that on the windward and lee sides. For the windward and lee sides, deposition mass increased as the mainstream velocity was increased for a given particle concentration. Capture efficiency was found to increase initially until the mainstream velocity reaches a certain value, where it begins to drop with mainstream velocity increasing. For the leading edge, capture efficiency followed a similar trend due to deposition spallation and detachment induced by aerodynamic shear at high velocity. Deposition formation was also strongly affected by the mainstream temperature due to its control of particle phase (solid or liquid). Capture efficiency initially increased with increasing mainstream temperature until a certain threshold temperature (near the wax melting point). Subsequently, it began to decrease, for wax detaches from the model surface when subjected to the aerodynamic force at the surface temperature above the wax melting point.

Keywords: gas turbine engine; particle deposition; capture efficiency; multiphase flow (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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