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Method for measuring erosion amount of aircraft surface under supersonic speed

A technology of aircraft and supersonic speed, which is applied in the direction of instruments, special data processing applications, electrical digital data processing, etc., and can solve the problems of not considering the impact of the impact surface, difficult to realize, and errors

Active Publication Date: 2013-06-05
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0007] The above formula can effectively simulate the erosion of solid particles, but it also has limitations: (1) The formula is suitable for calculating particle trajectories by the Lagrangian method. When the trajectory is in two dimensions, the Lagrangian method has its advantages, but in three-dimensional In the simulation of solids, the Euler method is often used. This formula is difficult to realize in the three-dimensional flow field; (2) sinθ in the formula has better adaptability to the specific two-dimensional situation, and needs to be changed in the three-dimensional situation ; (3) This formula does not consider the impact of the impact surface on the airflow, and there will be errors in the calculation of erosion

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  • Method for measuring erosion amount of aircraft surface under supersonic speed
  • Method for measuring erosion amount of aircraft surface under supersonic speed
  • Method for measuring erosion amount of aircraft surface under supersonic speed

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[0027] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0028] When calculating the three-dimensional erosion, it is more inconvenient to use the Lagrangian method to calculate. Therefore, the main calculation method is the Euler method, and the formula for calculating the erosion amount of the three-dimensional Euler method has not been seen so far. Therefore, there is It is necessary to propose a new erosion calculation method.

[0029] The present invention designs a method for measuring the amount of erosion on the surface of an aircraft at supersonic speeds, comprising the following specific steps:

[0030] Step (1): Collect the velocity V, density ρ and ambient pressure p of the incoming air on the surface of the aircraft under the supersonic state;

[0031] Step (2): According to the principle of conservation of mass and momentum, use the velocity V, density ρ, and ambient pressure p of the incoming air collected i...

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Abstract

The invention discloses a method for measuring erosion amount of an aircraft surface under supersonic speed. Conditions of the erosion amount of the aircraft surface can be calculated on the basis of calculation of flow field conditions and grain mass distribution conditions of the aircraft surface in an Eulerian method. According to the method for measuring the erosion amount of the aircraft surface under the supersonic speed, the calculated erosion amount of a three-dimensional aircraft is good in accuracy.

Description

technical field [0001] The invention relates to a method for calculating the surface erosion amount of an aircraft at supersonic speed. Background technique [0002] When an aircraft flies in the atmosphere at supersonic speed, it will encounter particles such as dust, raindrops, ice crystals, and snowflakes. On the one hand, these particles affect the characteristics of the boundary layer of the impact surface and increase convective heat transfer. On the other hand, the particles directly impact at high speed, resulting in impact The mass loss of the surface, we call this phenomenon erosion, the erosion of the surface seriously endangers the safety of the aircraft flying at hypersonic speeds, therefore, the erosion phenomenon is an important issue in the design of aircraft hypersonic protection. [0003] According to the classical erosion theory, the erosion retreat rate is considered to be a function of particle velocity, particle density, incident angle and material prop...

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Application Information

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IPC IPC(8): G06F19/00
Inventor 朱春玲王正之朱程香吴佩佩巫瑞锐檀妹静付斌
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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