A method for construct an adaptive component level simulation model of a variable cycle engine

A variable cycle engine and simulation model technology, applied in design optimization/simulation, special data processing applications, instruments, etc., can solve problems such as low fitting accuracy, achieve high output tracking accuracy, improve individual model accuracy, and strong adaptability Effect

Pending Publication Date: 2019-03-15
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

The linear model has a small amount of calculation and low resource consumption, but this method will inevitably introduce quadratic modeling errors when linearizing the nonlinear model, and the fitting accuracy of the linear model to the dynamic process of the engine is low

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  • A method for construct an adaptive component level simulation model of a variable cycle engine
  • A method for construct an adaptive component level simulation model of a variable cycle engine
  • A method for construct an adaptive component level simulation model of a variable cycle engine

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Embodiment Construction

[0042] The idea of ​​the present invention is to expand, design and develop the existing aero-engine simulation model to meet the needs of model-based multivariable control and predictive health management of advanced aero-engines, and to establish an adaptive component-level simulation model for states above idle, which can reduce the number of individual engines. Model errors caused by differences and performance degradation ensure a high degree of confidence in the accuracy of individual engine models.

[0043] The specific implementation mode of the present invention takes the construction of an adaptive component-level simulation model of a certain type of double-external culvert variable-cycle engine as an example, figure 1 is the schematic diagram of the variable cycle engine adaptive component-level simulation model, and the establishment of the simulation model includes the following steps:

[0044] Step A), establishing a non-linear component-level dynamic general mo...

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Abstract

A method for construct adaptive component level simulation model of variable cycle engine Based on the general nonlinear component-level dynamic model of variable cycle engines, an adaptive extended Kalman filter is proposed, After estimating the unmeasurable performance characteristic parameters of variable cycle engine components, The flow rate and efficiency charts of the components are updatedautomatically by using the estimated characteristic parameters, and the adjusted characteristic parameters of the components are used to calculate the aerodynamic and thermodynamic parameters of thecomponents, and the adaptive component-level simulation model of the variable cycle engine is established for the conditions above the slow state. The invention has strong adaptability to model mismatch caused by engine individual difference and performance degeneration, The accuracy of the nonlinear individual model of variable cycle engine is improved significantly, and the manual adjustment ofthe characteristics of engine air circuit components by experience is reduced, which leads to the enormous workload caused by model matching, and provides the model basis for the control and health management theory of variable cycle engine.

Description

technical field [0001] The invention relates to the field of aero-engine modeling and simulation, in particular to a method for constructing an adaptive component-level simulation model of a variable-cycle engine. Background technique [0002] Due to its adjustable geometric components, the variable-cycle engine can change the thermal cycle of the engine under different flight conditions to obtain the best flight performance. The basic structure of the double-external variable-cycle engine is as follows: figure 1 As shown, it mainly consists of two typical working modes. [0003] Single-pass mode: close the mode selection valve, reduce the area of ​​the front and rear adjustable bypass injectors (Variable Area Bypass Injector, VABI), so that almost all the air flow through the front fan flows through the core drive fan and high-pressure compressor , only a small part of the flow is allowed to pass through the external duct to cool the tail nozzle. At this time, the unit thr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/15G06F30/17G06F30/20Y02T90/00
Inventor 鲁峰李志虎黄金泉高天阳一周文祥
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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