Method for measuring rotational inertia of aero-engine under loading condition

Abstract

The invention belongs to the technical field of engine tests, and particularly relates to a method for measuring the rotational inertia of an aero-engine under a loading condition. The method comprises the steps that an air source control device drives an air turbine starter to rotate, the air turbine starter drives an engine to start, and a torque measuring device is arranged on a power transmission shaft; gas source conditions in the engine starting process are calibrated, and an engine starting test is carried out by using the calibrated gas source conditions; in a time period from successful starting to starting completion of the engine, different components are loaded according to a time sequence, residual torques of a plurality of time nodes of a power transmission shaft are obtained, and the engine rotating speeds of the corresponding time nodes are obtained; and the engine rotational inertia is determined. By measuring the rotational inertia of the plurality of time nodes in the starting process of the engine, the test data of the starting process of the engine can be obtained more accurately, and the powerful test data support is provided for the model selection of a starter for assembling the engine.

Description

technical field [0001] The application belongs to the technical field of engine testing, and in particular relates to a method for measuring the moment of inertia of an aeroengine under loading conditions. Background technique [0002] As one of the most important devices of an aircraft, an aeroengine can provide the necessary thrust for the flight of the aircraft. The transition of an aero-engine from a static state to a working state requires the belt rotation of the starter, and the output torque of the starter needs to overcome the influence of the rotational torque of the engine itself to achieve effective starting. For the assessment of the ground test of the aircraft starting system, the assessment of the starting system capability is generally required before the joint test with the engine. The moment of inertia of the engine directly affects the acceleration characteristics of the aircraft startup. The assessment of the aircraft is generally carried out together wi...

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Problems solved by technology

[0004] 1. Since the starting process of an aeroengine is a complex dynamic process, the structural parameters of its internal geometric components, the friction force during the rotor rotation process, the viscosity of lubricating oil, the oil-gas ratio of engine ignition, ignition energy, and air supply conditions, etc. Inertia measurement has a direct impact. How to accurately calibrate the moment of inertia of the engine and then obtain the engine, starter and aircraft starting load characteristics is itself a complex engineering problem;

[0005] 2. Traditionally, a gas turbine starter is used to start an aero engine. The performance index of the starter will be assessed before delivery. Generally, only whether the output power of the starter is up to the standard is checked, and it is impossible to check whether the starter can start the engine within a unit of time. The main reason is that the flywheel is used to simulate the moment of inertia of the engine in the standard test of the traditional starter, and the error is relatively large, which affects the assessment of the index;

[0006] 3. The moment of inertia in the traditional engine starting process is analyzed through parametric modeling. In the modeling process, relevant assumptions are often required, and the complex dynamic physical process is represented by a mathematical model. The cold and hot states of the rotor Clearance, influence of dynamic viscosity of lubricating oil, friction of rotor, fuel atomization efficiency, etc. will all cause large deviations in calculation results, which cannot be calculated accurately;

[0007] 4. In special environments such as plateau airports, the acquisition of engine inertia is crucial to the evaluation of aircraft starting capabilities. Often a large number of ground start tests are carried out in these special environments to find out, and it is impossible to simulate the special environment of the engine in a conventional test environment. Evaluate parameters such as the moment of inertia below, resulting in high costs such as development cycle and research and development costs

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