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Theoretical and experimental investigation of additive dragThe significance of additive drag is discussed and equations for determining its approximate value are derived for annular and open-nose inlets. Charts are presented giving values of additive drag coefficient over a range of free-stream Mach numbers for open and for annular-nose inlets with conical flow at the inlet. The effects on additive drag of variable inlet-total-pressure recovery and static pressures on the centerbody are investigated and an analytical method of predicting the variation of pressure on the centerbody with mass-flow ratio is given. Experimental additive-drag values are presented for a series of 20 degree and 25 degree cone half-angle inlets and one open-nose inlet operating at free-stream Mach numbers of 1.8 and 1.6. A comparison with the theoretical values of additive drag shows excellent agreement for the open-nose inlet and moderately good agreement for the annular inlets. (author)
Document ID
19930090982
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Sibulkin, Merwin
Date Acquired
September 6, 2013
Publication Date
January 1, 1954
Report/Patent Number
NACA-TR-1187
Accession Number
93R20272
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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