A high-altitude platform air pipeline system aerodynamic characteristic calculation method and system

Abstract

The invention provides a high-altitude platform air pipeline system aerodynamic characteristic calculation method and system, and the method comprises the steps of drawing an equivalent pipeline system based on a pipeline structure of a high-altitude platform pipeline system; based on a target conservation theorem, establishing a pneumatic mathematical model of the equivalent pipeline system; discretizing the pneumatic mathematical model, and establishing a target discrete mathematical model; based on the steady-state initial condition and the boundary condition of the high-altitude platform pipeline system, utilizing the target discrete mathematical model to calculate aerodynamic characteristic parameters of the high-altitude platform pipeline system, wherein the aerodynamic characteristic parameters comprise the change of physical parameters of airflow entering and exiting from the valve along with time, the change of physical parameters of airflow in the straight pipeline and the multi-way pipeline along with time, and the change of physical parameters of pipe walls of the straight pipeline and the multi-way pipeline along with time. The technical problems that in the prior art, the model adaptability range is narrow, and the aerodynamic parameters of the whole pipeline system are difficult to calculate are solved.

Description

technical field [0001] The invention relates to the technical field of aero-engine high-altitude simulation tests, in particular to a calculation method and system for the aerodynamic characteristics of an air pipeline system of a high-altitude platform. Background technique [0002] The air pipeline system, including air pipelines and regulating valves, is an important part of the aero-engine high-altitude simulation test bench (referred to as high-altitude bench), and is mainly used for the transportation, adjustment and mixing of air flow (hereinafter referred to as air flow). The calculation of the aerodynamic characteristics of the air pipeline system plays an important role in the adjustment of the intake and exhaust parameters of the engine, the development of the simulation system, and the design of the test process. [0003] There are two main ways to calculate the aerodynamic characteristics of the air pipeline system of high-altitude platform: one is to use commer...

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Problems solved by technology

The former can use mature commercial software for calculation without in-depth understanding of computer theory and calculation details, but it is difficult to implant the model and calculation results into the PLC industrial control program due to code packaging and large calculations, and it is difficult Direct application in simulation and real-time simulation systems limits the application of commercial software in the control of aerodynamic parameters of the air pipeline system of high-altitude platforms

In order to calculate the aerodynamic characteristics of the air pipeline system of the high-altitude platform, the Arnold Engineering Development Complex in the United States, the National Research Council of Canada, and the University of Stuttgart in Germany have developed an aerodynamic calculation method based on the lumped parameter model for the air pipeline system of the high-altitude platform. The lumped parameter model can only calculate the average aerodynamic parameters of the airflow in the pipeline cavity, but cannot calculate the gas parameters along the pipeline. It is difficult for the lumped parameter model to play a role in the aerodynamic characteristics of complex piping systems with inflow and multiple outflows

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