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Smart Control of Flow Separation around an Airfoil

机译：翼型周围流分离的智能控制

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In order to construct a control system for flow separation around an airfoil, continuous jet type vortex generator and optical cantilever sensor for discriminating flow condition were developed. Blowing jet apertures of the vortex generator are placed in airfoil surface at 0 and 30 % chord. The jet apertures were aligned span-wise on the suction surface. Locations and interval of the apertures were decided according to the previous data on the flow separation at low and high attack angles of the MEL001 airfoil. Most distinctive feature of the present jet vortex generator is that it can produce single, longitudinal vortex with arbitrary strength and extent by controlling the jet velocity distribution across the aperture. The optical cantilever sensor was developed. It was installed at the trailing edge. The sensor has two functions: discrimination of flow direction and compensation of temperature fluctuation of flow. The flow around the airfoil is controlled by actuating of the vortex generator and information from the optical cantilever sensor. The vortex generator can be used not only as an actuator but also as a tracer discharger. The longitudinal vortices are discharged as tracer for the flow monitoring. The discharged tracer vortices accumulate information on the flow around the airfoil as they travel downstream. Thus the flow condition is monitored by the sensor at the trailing edge. The monitored signals were sent to the computer and analyzed and then feedback control signal is sent to the actuator.
机译：为了构造用于翼型周围的流分离的控制系统，开发了用于区分流状态的连续射流型涡旋发生器和光学悬臂传感器。涡流发生器的吹孔位于翼型表面，弦长为0％和30％。喷射孔在吸力表面上沿翼展方向对准。孔的位置和间隔是根据先前有关MEL001机翼在低攻角和高攻角时的流分离数据确定的。本射流涡流发生器最显着的特征是，它可以通过控制整个孔径的射流速度分布而产生具有任意强度和程度的单个纵向涡流。开发了光学悬臂传感器。它安装在后端。该传感器具有两个功能：辨别流向和补偿流的温度波动。通过启动涡流发生器和来自光学悬臂传感器的信息来控制翼型周围的流动。涡流发生器不仅可以用作致动器，还可以用作示踪剂排放器。纵向涡流作为示踪剂排出，用于流量监控。排出的示踪剂涡流向下游传播时，会累积有关翼型周围流的信息。因此，在后缘通过传感器监控流动状态。监视的信号被发送到计算机并进行分析，然后反馈控制信号被发送到执行器。

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