17,790 research outputs found
Seeding considerations for an LV system in a large transonic wind tunnel
When it was decided to use a laser velocimeter to measure the properties of propellers, seeding was a great concern since large particles fail to flow and small ones are too small to be seen. Many methods were tried and weeded out by using a Malvern particle sizer. The most promising ones were tested in the tunnel and the laser velocimeter (LV) measurements compared to theoretical values of veocity as the particle approached a blunt nose body along a stagnation streamline. Data obtained from the LV system were compared with the one dimensional particle lag calculation. This figure showed the theoretical velocity over the blunt nose and a velocity profile for 5 um particles. This indicated the particles were approximately 5 um. The seeding method is shown. The seed was atomized by 2 seeders run with all 12 available atomizer jets on. The atomizer seed traveled from these two seeders through four 1 inch tubes 20 feet long to the plenum chamber where this cluster of tubes injected the seed into the air stream. The tubes were located 60 feet from the model and could be moved only by shutting the tunnel down. Future seeding plans are shown
Spatial Geometry and the Wu-Yang Ambiguity
We display continuous families of SU(2) vector potentials in 3
space dimensions which generate the same magnetic field (with det
). These Wu-Yang families are obtained from the Einstein equation
derived recently via a local map of the gauge field system
into a spatial geometry with -tensor and
connection with torsion defined from gauge covariant
derivatives of .Comment: Based on talks given by R. Khuri at PASCOS-94, Syracuse University,
May 1994 and at Gursey Memorial Conference I, Istanbul, June 1994, 7 pages,
TeX (typo in first Author's name is corrected.
An invariant of smooth 4-manifolds
We define a diffeomorphism invariant of smooth 4-manifolds which we can
estimate for many smoothings of R^4 and other smooth 4-manifolds. Using this
invariant we can show that uncountably many smoothings of R^4 support no Stein
structure. (Gompf has constructed uncountably many smoothings of R^4 which do
support Stein structures.) Other applications of this invariant are given.Comment: 19 pages. Published copy, also available at
http://www.maths.warwick.ac.uk/gt/GTVol1/paper6.abs.htm
Flight investigation of acoustic and thrust characteristics of several exhaust nozzles installed on underwing nacelles on an F106 airplane
To determine flyover noise and thrust and to investigate whether flight velocity significantly affects the noise of exhaust nozzles, a series of flight tests was conducted on three different exhaust nozzles of a type suitable for supersonic transport aircraft. The tests were conducted using an F-106B aircraft modified to carry two underwing nacelles, each containing a calibrated turbojet engine. A flyover altitude of 91 meters (300 ft) and a Mach number of 0.4 provided acoustic data that were repeatable to within + or -1.5 PNdB. Flyover results showed that an auxiliary inlet ejector nozzle was the quietest of the nozzles tested; flight velocity appeared to reduce its noise
Improved consolidation of silicon carbide
Alpha silicon carbide powder was consolidated by both dry and wet methods. Dry pressing in a double acting steel die yielded sintered test bars with an average flexural strength of 235.6 MPa with a critical flaw size of approximately 100 micro m. An aqueous slurry pressing technique produced sintered test bars with an average flexural strength of 440.8 MPa with a critical flaw size of approximately 25 micro m. Image analysis revealed a reduction in both pore area and pore size distribution in the slurry pressed sintered test bars. The improvements in the slurry pressed material properties are discussed in terms of reduced agglomeration and improved particle packing during consolidation
Development and utilization of a laser velocimeter system for a large transonic wind tunnel
The need for measurements of the velocity flow field about spinner propeller nacelle configurations at Mach numbers to 0.8 was met by a specially developed laser velocimeter system. This system, which uses an argon ion laser and 4 beam 2 color optics, was required to operate in the hostile environment associated with the operation of a large transonic wind tunnel. To overcome the conditions present in locating the sensitive optics in close proximity to the wind tunnel, an isolation system was developed. The system protects the velocimeter from the high vibrations, elevated temperatures, destructive acoustic pressures and low atmospheric pressures attendant with the operation of the wind tunnel. The system was utilized to map the flow field in front of, behind and in between the rotating blades of an advanced swept blade propeller model at a Mach number of 0.8. The data collected by the system will be used to correlate and verify computer analyses of propeller nacelle flow fields and propeller performance
Spherical alterations of handles: embedding the manifold plus construction
A key tool in our earlier work on ends of manifolds high-dimensional
manifolds was an ability to embed cobordisms provided by the Quillen Plus
Construction into those ends. Here we develop a `spherical modification' trick
which provides a constructive approach to obtaining such embeddings. More
importantly, this approach allows for more general embedding results. In this
paper we develop generalizations of the plus construction and show how the
corresponding cobordisms can be embedded in manifolds satisfying appropriate
fundamental group properties. Results obtained here play an important role in
our ongoing study of noncompact manifolds.Comment: This final version will appear in Algebraic & Geometric Topology.
Small corrections, including a fix to the statement of Theorem 5.3. 22 pages,
4 figure
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