Plume pressure measuring system for space engine test

The invention relates to the technical field of space engine ground tests, and provides a space engine test plume pressure measuring system, which at least comprises a differential pressure sensor, and the body of the differential pressure sensor is provided with a measuring end interface, a reference end interface and a back pressure interface; one end of the measuring end gas-guide tube is connected with the measuring end interface, and the other end is suitable for being arranged at a pressure measuring point in the plume field of the space engine; one end of the reference end gas-guide tube is connected with the reference end interface, and the other end is connected with the backpressure interface; wherein the back pressure interface at least comprises two gas channels with different inner diameters in the gas conveying direction, so that the gas pressure at the reference end interface is kept constant within a preset time period in the test. According to the measuring system, the system is simplified, a