interference drag

interference drag

interference drag
Drag caused by flow interference at the wing/fuselage, wing/nacelle, and other such junctions. This interference leads to the modification of boundary layers and creates a greater pressure difference between the fore-and-aft areas on the surfaces concerned. This, in turn, leads to greater total drag. Fairings or additional fillets are used to streamline these intersections and decrease interference drag.
References in periodicals archive ?
The dependence of these two classifications of drag on each other is referred to as interference drag [1, 2, 3, 4].
Thus, no surface other than the front lip of the lower fascia was adjudged to be experiencing significant interference drag.
Though not shown here, an analysis of local Cp data was done (similar to that of Figure 11) and again, aside from the front lip, no significant areas of interference drag were identified.
There are three types of parasitic drag: form drag (from blunt, non-lift producing surfaces), interference drag (from mixing air flows) and skin friction.
OThere is an aerodynamic phenomena called interference drag that occurs when two lifting surfaces intersect.
Wing drag was calculated as the sum of zero-lift drag, induced drag, wave drag, profile drag and interference drag.
The P-51 external tank is mounted close to the wing, and as a retired aerodynamic engineer Ill bet that the interference drag between the tank and wing is greater than the P-47 pylon installation.
Pratt & Whitney, along with Motoren-und Turbinen-Union (MTU) of Munich, West Germany, and Fiat Avio of Turin, Italy, has been addressing the key technologies of acoustics, interference drag, nacelle and variable-pitch fan design, and gear systems.
Installing an engine that is as much as 50 percent larger in diameter than a conventional turbofan of the same thrust requires careful integration of the wing, pylon, and nacelle such that the performance benefits are not lost to increased interference drag.
Because air flow that would have otherwise entered the grille must be diverted elsewhere in the closed grille condition, the external surfaces play a large role in the cooling drag term, this phenomena is called interference drag.
Historically, due to the difficulty of predicting underhood air flow patterns and interference drag, attempts at modelling were limited to momentum balances through the engine bay [15, 16, 17].

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