3003 W CASINO RD PAINT HANGAR BOUNDARIES 2023-07-20

Geminus Boeing Project Contract No.EVE-16-2929 Technology Development CEI Project No. 160731 • Testing experience: 45-04 was the first hangar that Neudorfer performed its velocity measurements (November 2005), before the 45-01 (December 2005) and 45-03 (August 2007) hangars • Measured velocities around the fuselage and tail were not close to the design values. Boeing concluded that an aircraft in the 45-04 would be "un-paintable" if the air flow around the fuselage was as measured- i.e., near zero or negative (upward) velocities). • Velocities around fuselage and tail predicted by CFD were within the range of the design values (100-175 fpm 1 ft from fuselage and 75-125 fpm 2 ft from edge of wings and horizontal stabilizers) • Equipment manufacturer does not recommend Nedorfer's method for using VelGrid, since its methods can allow side velocities to skew results Despite these issues with the 45-04 TAB data, the CFD air flow model was believed to be capable of accurately predicting the flow field around an aircraft in the 45-04 hangar based on previous comparisons with measured data for the 45-03 [2] and 45-01 [1] hangars. To within the measurement error/scatter, the CFD model did well in replicating the 45-03 and 45-01 airflow velocities near the crown and next to the fuselage where a majority of the painting (and flammable volatiles being emitted) will occur (the other location being the engine cowl). The measured vertical velocities around the wing are also very well replicated by the CFD to within the measurement scatter and accuracy of the measurements taken. The most important point is that the CFD predicted airflow velocities around the waterline of the fuselage is within the theoretical target values necessary for successful aircraft painting. 37