研究目的
Investigating the fabrication of trapezoidal shaped microstructures (riblets) using nanosecond pulse laser ablation for reducing friction in turbomachinery applications.
研究成果
Nanosecond pulse laser ablation can be effectively used to fabricate riblets on airfoil surfaces for turbomachinery applications, offering a balance between fabrication speed and cost. Preliminary wind tunnel tests indicate successful drag reduction, though further experiments are required for comprehensive validation.
研究不足
The quality of riblets fabricated with nanosecond pulse laser is not as high as those made with ultrashort pulse lasers. The study is preliminary, and further wind tunnel experiments are needed to fully validate the results.
1：Experimental Design and Method Selection:
Utilized nanosecond pulse laser ablation to fabricate riblets on airfoil surfaces. Studied the influence of different laser parameters (scanning speed, pulse length, repetition rate) on riblet fabrication.
2：Sample Selection and Data Sources:
Used flat aluminum samples and real airfoils for riblet fabrication. Measured riblet heights and shapes using optical and confocal laser microscopy.
3：List of Experimental Equipment and Materials:
IPG YLPM-1-4x200-20-20 nanosecond pulse laser, galvanometric scanner, telecentric f-theta lens, Akribis Systems 3-dimensional travelling tables, Constant Temperature Anemometer (CTA) for wind tunnel measurements.
4：Experimental Procedures and Operational Workflow:
Fabricated riblets on test samples and airfoils, measured their dimensions and shapes, and tested their performance in a wind tunnel.
5：Data Analysis Methods:
Analyzed riblet heights and shapes from microscope images, measured drag reduction in wind tunnel tests.
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IPG YLPM-1-4x200-20-20 nanosecond pulse laser
YLPM-1-4x200-20-20
IPG
Used for fabricating trapezoidal shaped microstructures (riblets) on airfoil surfaces.
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galvanometric scanner
Used for directing the laser beam during the fabrication process.
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telecentric f-theta lens
f = 100 mm
Used for focusing the laser beam during the fabrication process.
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Akribis Systems 3-dimensional travelling tables
Akribis Systems
Used for positioning the samples during the fabrication process.
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Constant Temperature Anemometer (CTA)
Used for measuring velocity and turbulence in the wind tunnel.
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