Accession Number:

AD0610067

Title:

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

Descriptive Note:

Corporate Author:

RAND CORP SANTA MONICA CALIF

Personal Author(s):

• COLE,J. D.

Report Date:

1965-01-01

Pagination or Media Count:

16.0

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

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE