Measuring system and method for thrust line of nozzle engine with small size and large expansion ratio

Abstract

The invention discloses a measuring system and method for the thrust line of a nozzle engine with a small size and a large expansion ratio. The measuring base has a docking part, and the axis of the docking part roughly coincides with the axis of the measuring base; the measuring device includes a main shaft, a measuring part and a throat Positioning component, the main shaft is also equipped with a nozzle outlet end face positioning component, the main shaft, measuring part, throat positioning component and nozzle outlet end face positioning component are coaxially arranged; the external surface scanner is used to scan the position of the measuring base and the measuring part Outer surface; the computing device is connected with the outer surface scanner, fits the axis of the measuring base and the axis of the measuring part according to the outer surface, and calculates the clamping distance between the axis of the measuring base and the axis of the measuring part according to a preset algorithm. Angle, to obtain the deflection value of the engine thrust line, and / or the distance between the intersection point of the axis of the measuring base and the axis of the measuring part on the docking part, to obtain the lateral shift value of the engine thrust line. The invention is applicable to the thrust line deflection and traverse measurement of the engine of the nozzle with small size and large expansion ratio.

Description

technical field [0001] The invention relates to the technical field of engine thrust line measurement, in particular to a measurement system and method for a thrust line of a nozzle engine with a small size and a large expansion ratio. Background technique [0002] The thrust line of the engine is the line connecting the center of the throat cross-section of the engine thrust chamber and the center of the outlet end face of the nozzle. Due to the accumulation of various manufacturing, assembly, and installation errors, the installed engine is deflected and laterally shifted from the pre-designed attitude. As a result, the actual thrust line cannot coincide with the designed thrust line, causing the engine to generate a deflection moment during operation, directly affecting the attitude control, causing the system to add a new attitude control and calibration comparison program, and even causing the engine to be unusable in severe cases. In order to ensure that the deflection...

AI Technical Summary

Problems solved by technology

However, the above non-contact measurement methods cannot be called non-contact measurement in the strict sense. For example, when measuring with a laser tracker, the reflector of the laser tracker needs to be placed at the throat position. For the measurement of nozzles with small size and large expansion ratio When there is no operating space at the throat position, it cannot be measured, or it is necessary to introduce measurement errors with the help of fixtures

[0005] Contact measurement methods include: (1) Early thrust line measurement was carried out with mechanical measuring instruments such as dial gauges, and the measurement accuracy was low; (2) Three-coordinate measurement, for small-sized engine stand-alone or assembly compartments, can be used as a whole When placed under the three-coordinate measuring equipment, the throat section, nozzle outlet end face, and reference parameters are measured by the three-coordinate probe contact, and the thrust line deflection and lateral movement are calculated. The operation is convenient and the measurement results are accurate. When the measured object When the spatial size exceeds the measurable range of the three-coordinate measuring equipment, it cannot be used

Contact measurement is only suitable for small engine stand-alone thrust line measurement. Once the small engine is installed in the entire power system cabin, the measured object exceeds the measurement range of the contact measurement equipment

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