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ESTIMATE FOR THE PRESSURE ON RAPIDLY ACCELERATING BODIES IN HIGH-SPEED FLIGHT,
RAND CORP SANTA MONICA CALIF
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
AF49 638 700