The present study deals with the problem of aerodynamic interference between parallel bodies with the intention of establishing simplified methods of estimating aerodynamic characteristics of a rocket with auxiliary boosters around a main one. Flow field around a combination of three bodies with their axis placed parallel in one plane is obtained by the use of the slender-body theory. Formulas of calculating normal and side forces on the body combination are obtaind as functions of the angle of attack, the bank angle, the body diameter ratios, and the relative distances between bodies. The results of the theory is compared with those of wind tunnel tests for a three-body combination and fairly good agreement is obtaind between them. It is pointed out that the present method can easily be extented to combinations of more than three bodies and also that normal and side forces on a combination with four bodies symmetrically located around a central circular cylinder are estimated to vanish regardless of the bank angle.
胴体相互干渉の近似推定法
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