Study Of Oscillation Jet To Improve Aerodynamic Characteristics Of Air Vehicle

Oscillation jet flow control technology is an effective and active flow control technology. In thispaper, the oscillation jet flow control technology and its applications in improving the aerodynamiccharacteristics of air vehicle have been studied in detail.First, an oscillation jet element is designed and its structure parameters are optimized bystudying the impact of the structure parameters of the oscillation jet element to the switchingperformance of jet, and it is designed to be mini, then its flow field characteristics are investigated bynumerical simulations. And then using this mini oscillation jet element, an oscillation jet device withfrequency and flow as its adjustable parameter is designed, and its flow field characteristics aremeasured by hot wire.In the experiment study of the oscillation jet to improve the flow separation of the airfoil, fivemini oscillation jet elements are evenly arranged in NACA0018airfoil. By changing differentexcitation parameters of oscillation jet under different wind speed, a box balance is used to measurethe aerodynamic force under different excitation parameters. By comparing their lift curve, the effectof oscillation jet under different excitation parameters to the aerodynamic characteristics of airfoil isobtained. At the same time, in order to observe the effect of oscillation jet to delay flow separationmore intuitively, PIV is used to measure the flow field of the airfoil surface at the Angle of attack of17degrees with and without excitation.In the experiment study of the oscillation jet to improve the asymmetric vortex of the slenderbody, oscillation jet of two kinds of devices is used in the nose of the body. By changing differentexcitation parameters of oscillation jet under different wind speed using these two kinds of devices,PSI pressure scanning value is used to measure the pressure distribution of the body under differentexcitation parameters. By comparing their pressure distribution curve, the effect of oscillation jetunder different excitation parameters to improve the asymmetric vortex of the slender body isobtained.