Estimate for the pressure on rapidly accelerating bodies in high-speed flight

by Julian D. Cole

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The pressure on a slender accelerating airfoil or body of revolution traveling at high speed is estimated by using snowplow theory in a plain transverse to the direction of motion. With this theory, a simple explicit expression is obtained or 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)/(speed). The results of the analysis show that only in extreme cases does acceleration or deceleration exert an important effect on air forces. The pressure on a slender accelerating airfoil or body of revolution traveling at high speed is estimated by using snowplow theory in a plain 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)/ (speed). The results of the analysis show that only in extreme cases does acceleration or deceleration exert an important effect on air forces. 18 pp.

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