High-precision liquid or gas rocket engine thrust rack

Abstract

The purpose of the invention is to provide a high-precision liquid or gas rocket engine thrust measuring rack. The thrust measuring rack is prominently characterized in that a propellant supply pipeline of an engine and a measuring line pipeline are arranged into three segments, namely a vacuum chamber and fixed frame connecting segment, a corrugated pipe connecting segment between a fixed frame and a mobile frame and a mobile frame pipeline and engine pipeline connecting segment. A single working-segment plate spring is adopted to connect the fixed frame with the mobile frame, and three safety limiting devices are arranged. An in-situ thrust calibration device and the safety limiting devices are arranged. Before a test engine is installed and hot rest run is carried out, a working sensor is calibrated. The high-precision liquid or gas rocket engine thrust rack has the advantages that the interference of a pipeline system to engine thrust measurement is greatly reduced; the overall accuracy of the thrust measuring rack is increased; and the damage to the thrust measuring rack due to the disordered engine work can be prevented.

Description

technical field [0001] The invention relates to the technical field of aerospace engine testing, in particular to a high-precision liquid or gas rocket engine thrust measuring bench. Background technique [0002] During the test run of the rocket engine, the basic method of thrust measurement is to fix the engine on the moving frame of the thrust frame, and the moving frame and the fixed frame of the thrust frame are connected by spring plates. During the test run, the thrust generated by the engine makes the moving frame and the engine They move together in the thrust direction and act on the load cell through the force transmission mechanism. The thrust frame mainly consists of three parts, one is the thrust transmission mechanism, which is composed of a fixed frame, a moving frame, a spring leaf and pre-tightening force components, etc.; the other is a measuring device, including a working force sensor, a transmission cable, and a data acquisition device; the third is On...

AI Technical Summary

Problems solved by technology

[0004] It is very difficult to accurately measure the thrust of the engine. The transmission of thrust from the engine to the sensor is easily affected by many factors: 1) The support and restraints between the movable frame and the fixed frame of the thrust frame; 2) The propellant delivery pipe , pressure measuring tube, etc., and the influence of pressure and fluid momentum in the propellant pipeline; 3) Test run on a vertical or inclined test bench, the pipeline behind the main valve of the engine, the head of the thrust chamber, and the nozzle are cooled Variations in the propellant charge in the jacket and ablation of the ablative nozzle cause engine weight to vary and therefore affect thrust measurement accuracy

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