Low-temperature simulation device and method for hard object impact test of aero-engine blade

The invention discloses a low-temperature simulation device and method for an aero-engine blade hard object impact test, an impact assembly of the device extends into a low-temperature protection assembly along the horizontal direction, a cooling assembly is arranged on the low-temperature protection assembly along the circumferential direction, and a temperature measurement assembly is arranged on the low-temperature protection assembly along a certain inclination angle. And the test piece clamping assembly is arranged in the low-temperature protection assembly. The method comprises the following steps: installing a test piece on a test piece clamping assembly; the test piece clamping assembly is installed in the low-temperature box body; a gun barrel and a supporting stopper of the impact assembly extend into the low-temperature box body through the incidence channel; the cold end pipes of the four groups of cooling assemblies extend into the low-temperature box body through the positioning holes, and cold