Determining the Time-Dependent Aerodynamic Characteristics by Calculating the Steady-State Flow Past Vehicles with a Modified Cross-Sectional Shape

Abstract

A method of determining the time-dependent aerodynamic characteristics of flight vehicles by numerically calculating the steady-state flow past equivalent bodies is developed. The method can be rigorously validated if a hypothesis of local force interaction (in particular, the hypersonic piston analogy or the plane sections law) is adopted. The well-known curved-body method of V. V. Lunev is considerably improved by obtaining some new, aerodynamically equivalent vehicle shapes which maximally correspond (without the errors inherent in auxiliary transformations) to the postulated scheme of local calculation of the distributed aerodynamic forces. The technique developed makes it possible to calculate the combined effect of the angle of attack, the angular velocities, and the position of the center of oscillation on the damping coefficients. For vehicles in the shape of blunt circular cones the results obtained are in good agreement with the data calculated using the linear expansion method.