Using Unigraphics, a computer model incorporating a leading edge shadow bar has been developed to predict EB-PVD coating thickness for a PW4000 second stage blade. The effects of shadow bars were studied, and interesting results were discovered. The results of the computer model experiments indicated that the addition of a leading edge shadow bar effects the concave surface of the blade the most while it has minimal effects on the coating thickness on the convex surface. When increasing the diameter and/or distance of the shadow bar from the leading edge, the amount of TBC deposition on the concave surface of the blade will decrease. It was concluded that a leading edge shadow bar should not be utilized in the coating process as it reduces the amount of TBC distributed to the concave side, which is a section of the turbine blade that typically requires more coating, not less. Normalized comparisons between the prediction model and actual data were made, and the graphs showed that the sets of data followed a similar trend line, which ultimately means the modified prediction model does in fact work.

• This report represents the work of one or more WPI undergraduate students submitted to the faculty as evidence of completion of a degree requirement. WPI routinely publishes these reports on its website without editorial or peer review.

Creator

• Fyfield, Jahdiel Kyle
• Turner, Matthew A.
• Swatson, Daniel M.

Publisher

• Worcester Polytechnic Institute

Identifier

• 02D359M

Advisor

• Sisson, Richard D.

Year

• 2002

Sponsor

• Pratt & Whitney

Date created

• 2002-01-01

Resource type

• Major Qualifying Project

Major

• Mechanical Engineering

Rights statement

• In Copyright