Study on Variable-Shape Supersonic Inlets and Missiles with MRD Device

摘要

This paper proposes a new aerodynamic device, which was designated Multi-Row-Disk (MRD). This device has a cone and stabilizer disks being arranged in the axial direction. This device can arbitrarily change its aerodynamic characteristics by translating stabilizer disks. In the first part of this paper, effect of several nose shape configurations including the MRD device on the aerodynamic characteristics is reported. By increasing number of stabilizer disks, zero-lift drag and induced drag can be reduced. It was also found that putting cavities on the conical surface is effective for improving longitudinal static stability. In the second part, effect of cavity flow instability on pressure and strain oscillation is reported. We drew the design criterion that the configuration of stabilizer disks should be determined not to couple the 1st. mode with pressure oscillation frequency, which can be predicted with Rossiter's formula.