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NACA-TR-1193

Theoretical performance characteristics of sharp-lip inlets at subsonic speeds

contributor authorNASA - National Aeronautics and Space Administration (NASA)
date accessioned2017-09-04T15:06:21Z
date available2017-09-04T15:06:21Z
date copyright01/01/1954
date issued1954
identifier otherLERXYDAAAAAAAAAA.pdf
identifier urihttps://yse.yabesh.ir/std/handle/yse/3921
description abstractSUMMARY
A method is presented for the estimation of the subsonic-flight-speed characteristics of sharp-lip inlets applicable to supersonic aircraft. The analysis, base on a simple momentum balance consideration, permits the computation of inlet-pressure-recovery–mass-flow relations and additive-drag coefficients for forward velocities from zero to the speed of sound.
The penalties for operation of a sharp-lip inlet at velocity ratios other than 1.0 may be severe; at lower velocity ratios an additive drag is incurred that is not cancelled by lip suction, while at higher velocity ratios, unavoidable losses in inlet total pressure will result. In particular, at he take-off condition, the total pressure and the mass flow for a choked inlet are only 79 percent of the values ideally attainable with a rounded lip. Experimental data obtained at zero speed with a sharp-lip super-sonic inlet model were in substantial agreement with the theoretical results.
languageEnglish
titleNACA-TR-1193num
titleTheoretical performance characteristics of sharp-lip inlets at subsonic speedsen
typestandard
page12
statusActive
treeNASA - National Aeronautics and Space Administration (NASA):;1954
contenttypefulltext
subject keywordsAERODYNAMIC
subject keywordsAIR
subject keywordsAIRCRAFT
subject keywordsANALYSIS
subject keywordsANGLE
subject keywordsATTACK
subject keywordsCOEFFICIENTS
subject keywordsCORRELATION
subject keywordsDESIGN
subject keywordsDRAG
subject keywordsEXPERIMENTATION
subject keywordsFLOW
subject keywordsINTAKES
subject keywordsMASS
subject keywordsPERFORMANCE
subject keywordsPREDICTION
subject keywordsPRESSURE
subject keywordsRECOVERY
subject keywordsSHARPNESS
subject keywordsSPEED
subject keywordsSUBSONIC
subject keywordsSUPERSONIC
subject keywordsTECHNIQUES
subject keywordsTHEORIES
subject keywordsZERO


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