Potential Flow in Engine Valves Page: 21 of 29
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N.A.C.A. Technical Memorandum No. 343
flow then detaches itself, a phenomenon which is known -from the
diffuser. Similar relations also exist here. It is interesting
that the points of the detachment of the Schrenk flow, plotted
to scale, lie approximately in a straight line at an angle of
250. It is therefore very natural, in connection with the
Schrenk flow, to think of a diffuser in which the flow detaches
itself. It is very difficult to treat this problem mathematic-
ally. We can determine approximately the course of the veloc-
ity along the horizontal wall and find a dependence according
to the -1/3 power, on account of the flow at an angle of 900
It is, however, doubtful as to whether the pressure changes
with the velocity and finally becomes -co in the angle. For
this case, the methods of the Prandtl theory of a boundary
layer fail completely, because they assume a constant pressure.
Translation by Dwight M. Miner,
National Advisory Committee
for Aeronautics.20
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Eck, Bruno. Potential Flow in Engine Valves, report, December 1925; (https://digital.library.unt.edu/ark:/67531/metadc65148/m1/21/?rotate=270: accessed March 28, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.