Accession Number : AD0020149
Title : CONE DRAG IN A RAREFIED GAS FLOW
Descriptive Note : Technical rept.
Corporate Author : CALIFORNIA UNIV BERKELEY INST OF ENGINEERING RESEARCH
Personal Author(s) : Ipsen, D C
Report Date : 10 Aug 1953
Pagination or Media Count : 60
Abstract : The tests were conducted to obtain empirical cone-drag information about the intermediate slip-flow regime. The mean free path of the gas adjacent to the cone surface ranged from 10 to 15% of the calculated displacement- thickness of the boundary layer at the base of the cone. The total drag on the fore portion of a 15 deg half-angle cone (3.70-in. slant length) was investigated. A compact remote balance was developed which gave sufficient accuracy for the measurement of the small forces involved. Drag coefficient curves were obtained which are probably accurate to within 2 to 3% or better at M = 4.0 and possibly 5% at M = 2. The experimental results for viscous drag were 10 to 30% above the predictions based on first-order boundary-layer analysis of shear and pressure distribution. A description of the experimental apparatus and details of the calibration and testing techniques are appended.
Descriptors : *DRAG , *RAREFIED GASES , ACCURACY , BOUNDARY LAYER , SURFACES , CONICAL BODIES , SLANT RANGE , MEAN FREE PATH , PRESSURE DISTRIBUTION , VISCOSITY , LENGTH , CALIBRATION
Subject Categories : Fluid Mechanics
Distribution Statement : APPROVED FOR PUBLIC RELEASE