Sub-cross flow field control method and device based on gate finger adjustment

The invention provides a sub-cross flow field control method and device based on grid finger adjustment, and the method comprises the steps: determining a preset position of a grid finger according to a preset Mach number of a sub-cross flow field; the gate fingers are moved to a preset position, and the total pressure of the front chamber is adjusted through the main pressure adjusting valve; under the condition that the total pressure of the front chamber meets the preset total pressure, the position of the grid finger is adjusted until the Mach number of the test section reaches the preset Mach number; and carrying out a continuous attack angle change test in the test section, and adjusting the position of the gate finger based on the actually measured static pressure and PID parameters of the test section in the test process, so that the Mach number of the test section is stabilized in the floating range of the preset Mach number. According to the invention, the position of the gate finger is adjusted in