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<br /> ZiGeminus Boeing Project Contract No.EVE-16-2929
<br /> Technology Development CEI Project No. 160731
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<br /> Figure 31: Paint gun locations and orientations for Case 1/Scenario 2.
<br /> 3.3.1 % of LEL CFD Predictions
<br /> Results of the computation are shown in the Figure 32 through Figure 45, with Figure 32
<br /> illustrating the computed % of LEL levels on the hangar/aircraft symmetry plane. The highest %
<br /> of LEL levels are located at or below the active painting location at the tail as would be
<br /> expected. Very small % of LEL levels (<-0.2%) are located at the hangar all near the nose and
<br /> tail due to the lack of direct air supply from above or floor exhaust. Figure 33 shows a collection
<br /> of cross sections through the building along the nose to tail of the aircraft (see Figure 34 for
<br /> exact locations) and shows that the highest % of LEL values are around the engine cowl painting
<br /> station and are due to the lack of direct path to a floor exhaust to remove the overspray. All the
<br /> % of LEL cross sections are shown in Figure 35 through Figure 41 and include a denoted
<br /> horizontal and vertical length scale (units of feet). These also illustrate that the source of the
<br /> vapor is from the overspray at the engine cowl location due to the lack of a suitably-placed floor
<br /> exhaust.
<br /> Figure 43 shows the % of LEL contour levels at the "fuselage water line" (where the fuselage
<br /> TAB data was taken.
<br /> A better method to locate areas of certain % of LEL levels is shown in Figure 44 and Figure
<br /> 45 and depicts the hangar volumes containing greater than 5 and 10 % of LEL values as
<br /> computed for Case 1/Scenario 2 (original 45-04 configuration, nominal paint mode). The
<br /> highest volume of 5 % of LEL levels are just under the fuselage painting locations. As
<br /> previously noted, the highest level at the cowl painting location is due to the lack of a floor
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