Ministry of Supply

About: Ministry of Supply is a based out in . It is known for research contribution in the topics: Polarography & Bacillus (shape). The organization has 416 authors who have published 355 publications receiving 8951 citations. The organization is also known as: MoS.

Experiments on Circular Cones at Yaw in Supersonic Flow

Abstract: T PROBLEM of supersonic flow past circular cones a t yaw has received considerable at tent ion from theoretical research workers in recent years. Several methods of solution have been proposed, 5 and those based on Stone's paper have been used as the basis for very extensive tables of data. I t is, therefore, ra ther surprising t ha t experimental information on this problem is comparatively scanty, and tha t no set of observed results comparable to the tables calculated by Kopal a t Massachusetts Ins t i tu te of Technology is available. In the present paper an account is given of measurements of pressure on two circular cones of semiapex angles 15° and 20° over a range of angles of yaw between 0° and 25°. T h e measurements are made a t one Mach Number in the Supersonic Wind Tunnel at tached to the Applied Mathematics and Mechanics Division a t For t Halstead. Existing results appear to refer to cones much thinner than these and are given a t somewhat arbi trary angles of yaw. The present results should, therefore, be of value in showing pressure distributions on cones producing shocks of considerable strength which, when yawed, display marked variations in entropy in the flow behind them. Further , the variation of pressure distribution with angle of yaw has been shown in a systematic manner, and the da ta given are probably more complete than those published previously. The results are of value in themselves, bu t they are also suitable as a s tandard against which the more firmly established theoretical methods can be tested Accordingly, the pressure distributions a t Mach Num-

A Radio Method of determining the Velocity of a Shock Wave

Abstract: THE study of the physics of shock waves of sufficiently high intensity to produce appreciable gaseous excitation and ionization has in recent years become of increasing interest in relation to the gas dynamics of astrophysical phenomena and to the properties of gases at very high temperatures.

Phase-Change in 1,2,4,5-Tetrabromobenzene investigated by Pure Quadrupole Resonance

Abstract: IT is the purpose of this communication to mention a result of a type which we believe to be hitherto unreported, which we obtained when the temperature dependence of the bromine-81 pure quadrupole resonance at about 240 Mc./s. in 1,2,4,5-tetrabromobenzene was investigated. Here, on raising the temperature above 20° C., there is as usual a linear decrease of frequency. However, a very sudden discrete drop occurs at 46.5° C., after which there is again a linear decrease. On then reducing the temperature, the increase of frequency is linear as far as 33.5° C., where there is a sudden discrete rise, the frequency returning to the original line and completing a hysteresis loop.