Accession Number : AD0610067

Title :   ESTIMATE FOR THE PRESSURE ON RAPIDLY ACCELERATING BODIES IN HIGH-SPEED FLIGHT,

Corporate Author : RAND CORP SANTA MONICA CALIF

Personal Author(s) : COLE,J. D.

Report Date : JAN 1965

Pagination or Media Count : 16

Abstract : The pressure on a slender accelerating airfoil or body of revolution traveling at high speed is estimated by using snowplow theory in a plane transverse to the direction of motion. With this theory a simple explicit expression is obtained for the pressure distribution on the body. The theory is valid for rapid accelerations and provides a quantitative estimate of the effect of acceleration on the air forces. The significant parameter measuring the effect is shown to be a Froude number, Fr = (body length) (acceleration) / sq (speed). The results from this analysis show that only in extreme cases does acceleration or deceleration exert an important effect on air forces. For example, a 50-ft missile accelerating 1000 g at Mach 4 has approximately 10 per cent larger wave resistance than one without acceleration. (Author)

Descriptors :   (*HYPERSONIC FLIGHT, SLENDER BODIES), (*SLENDER BODIES, AERODYNAMIC CHARACTERISTICS), AIRFOILS, BODIES OF REVOLUTION, ACCELERATION, AERODYNAMIC LOADING, PRESSURE, SHOCK WAVES, DECELERATION, MATHEMATICAL ANALYSIS, FLUID MECHANICS

Distribution Statement : APPROVED FOR PUBLIC RELEASE