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Fuel metering device design parameter adjusting method based on characteristic equation root locus

A technology for measuring devices and design parameters, applied in measuring devices, special data processing applications, electrical digital data processing, etc., can solve problems such as instability, and achieve the effects of improving stability, high efficiency, and high precision

Active Publication Date: 2021-06-18
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0004] In view of this, the object of the present invention is to provide a fuel metering device design parameter adjustment method based on the root locus of the characteristic equation, in order to solve the instability problem of the fuel metering device of the aero-engine, and effectively improve the stability of the fuel metering device

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  • Fuel metering device design parameter adjusting method based on characteristic equation root locus
  • Fuel metering device design parameter adjusting method based on characteristic equation root locus
  • Fuel metering device design parameter adjusting method based on characteristic equation root locus

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Embodiment 1

[0047] see Figure 1-Figure 9 , this embodiment uses a certain fuel metering device (such as figure 1 As shown in ), a method for adjusting design parameters of a fuel metering device based on the root locus of the characteristic equation is provided.

[0048] The main function of the metering valve assembly 2 is to control the amount of fuel in the engine by adjusting the opening of the metering valve window 1. The flow rate of the metering valve window 1 can be calculated by the following formula:

[0049]

[0050] In formula (1), C d is the flow coefficient, A is the opening area of ​​the metering valve window 1, which is determined by the valve core displacement x in the metering valve assembly 2 j decision, Δp 1 is the pressure difference before and after metering, and ρ is the fuel density. Assumed flow coefficient C d and fuel density ρ are constant, according to the formula, if keep Δp 1 is a constant, the flow rate is only proportional to the displacement of ...

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Abstract

The invention discloses a fuel metering device design parameter adjusting method based on a characteristic equation root locus. The method comprises the following steps: S1, establishing a dynamic mathematical model; s2, performing linearization processing on the dynamic mathematical model by using a small deviation linearization method to obtain a linearization equation; s3, establishing a transfer function model of the fuel metering device by utilizing the linearization equation; and s4, determining key design parameters based on the characteristic equation root locus, and improving the stability of the fuel metering device by adjusting the numerical values of the key design parameters. Aiming at the stability problem of the aero-engine fuel metering device, a dynamic mathematical model of the aero-engine fuel metering device is established through a flow continuity equation and a force balance equation, linear processing is conducted on the nonlinear equation of the aero-engine fuel metering device, and with application of the fuel metering device design parameter adjusting method based on the characteristic equation root locus, the stability of the fuel metering device is effectively improved.

Description

technical field [0001] The invention relates to the field of design and debugging of an aero-engine fuel metering device, in particular to a method for adjusting design parameters of a fuel metering device based on the root locus of a characteristic equation. Background technique [0002] The main function of the fuel metering device of an aero-engine is to measure the fuel flow supplied to the combustion chamber to control the engine speed. The fuel metering device of the engine may be unstable during actual use. For example, the pressure of the outlet fuel will oscillate, which will cause the oscillation of the engine speed and make the engine unable to work normally. [0003] At present, if the engine is unstable, the general method is to change the value of the design parameters sequentially according to engineering experience until the stability is improved. This method lacks theoretical guidance. Since the fuel metering device has many design parameters, if the empiric...

Claims

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Application Information

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IPC IPC(8): G01F9/00G06F30/17
CPCG01F9/00G06F30/17G06F2111/10G06F2119/14
Inventor 陈昭旸
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS