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Airworthiness certification method for influences of different flying angles on stall/surge characteristics of aero-engine

A technology of aero-engine and surge characteristics, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as no experience to follow

Inactive Publication Date: 2014-12-10
BEIHANG UNIV +1
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Problems solved by technology

At present, my country has not established a complete airworthiness certification standard in the field of aero-engine stall / surge, and the research on certification methods is also in its infancy, and there is no experience to follow.

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  • Airworthiness certification method for influences of different flying angles on stall/surge characteristics of aero-engine
  • Airworthiness certification method for influences of different flying angles on stall/surge characteristics of aero-engine
  • Airworthiness certification method for influences of different flying angles on stall/surge characteristics of aero-engine

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Embodiment Construction

[0038] The airworthiness certification method of different flight angles of attack of the present invention on the influence of aeroengine stall / surge characteristics, its specific implementation is as follows image 3 shown. In order to describe the present invention more clearly, the specific embodiment takes the compressor operating at α=25 flight angle of attack as an example, and further describes the present invention in conjunction with the accompanying drawings.

[0039] The example of the present invention is a single-rotor compressor with a design flow rate of 13.5kg / s, a design pressure ratio of 1.6, a design speed of 22000rpm, and a design efficiency of 0.84. :

[0040] (1) Obtain the engine model, and the general characteristics of the compressor in the case of uniform air intake, including the total pressure ratio-flow characteristics and adiabatic efficiency-flow characteristics, such as Figure 4 The solid black square curve is shown;

[0041] (2) Obtain the...

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Abstract

The invention relates to an airworthiness certification method for influences of different flying angles on stall / surge characteristics of an aero-engine. The method includes the steps that firstly, a change rule curve map of the distortion range AP and the distortion degree PP of total pressure air inlet distortion characteristic parameters at different flying angles along with change of Ma numbers is established according to a numerical calculation method; then, according to the map and a one-dimensional model, a general characteristic curve and a surge margin of the aero-engine can be calculated; otherwise, starting from the stall / surge airworthiness standard of the aero-engine, a method for determining the limit flying angle of the aero-engine is proposed; finally, in combination with relevant files of CAAC rules, airworthiness certification processes for stall / surge of the aero-engine are formulated.

Description

technical field [0001] The invention relates to an airworthiness certification method for aero-engine stall / surge under the condition of total pressure intake distortion, in particular to the airworthiness certification process for the influence of different flight angles of attack on aero-engine stall / surge and the determination of the limit flight angle of attack method. Background technique [0002] Airworthiness is the abbreviation of airworthiness, which refers to the qualities necessary for an aircraft to meet the minimum safety standards and fly smoothly under the predetermined operating environment and use restrictions. In developed countries such as Europe and the United States, especially the relevant agencies represented by the US Federal Aviation Administration (FAA), after long-term research and accumulation, a set of advanced airworthiness management models and management concepts have been formed. In China, although special agencies have been set up for airwo...

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Application Information

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IPC IPC(8): G06F19/00
Inventor 李志平王孟琦夏双枝
Owner BEIHANG UNIV
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