Combustion criterion analyzing method of dry chamber near oil tank under impact of metal chips

A technology of metal fragments and analysis methods, which is applied in the fields of electrical digital data processing, special data processing applications, instruments, etc., to achieve the effect of simple and intuitive expression, improving survivability, and reducing the probability of combustion and explosion.

Active Publication Date: 2013-06-19
NORTHWESTERN POLYTECHNICAL UNIV
View PDF2 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention first analyzes the fuel tank penetration model under the impact condition of high-speed metal fragments, and solves the penetration problem of the fuel tank wall through the JTCG/ME penetration equation; analyzes the qualit

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Combustion criterion analyzing method of dry chamber near oil tank under impact of metal chips
  • Combustion criterion analyzing method of dry chamber near oil tank under impact of metal chips
  • Combustion criterion analyzing method of dry chamber near oil tank under impact of metal chips

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0034] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0035] This embodiment relates to a quantitative analysis method for the continuous combustion criterion of the dry compartment near the fuel tank at different flight altitudes.

[0036] This embodiment simplifies the fire process of the dry compartment near the fuel tank under the condition of high-speed metal fragment penetration into six stages, as figure 1 and figure 2 shown, where:

[0037] Stage 1, high-speed metal fragments hit the fuel tank, forming collision sparks, that is, the ignition source of the dry cabin; the formation of the ignition source is mainly due to the high-speed metal fragments generated when the engine blade structure fails, and the fragments are in the process of breaking through the aircraft fuel tank wall. The friction of the fuel tank wall, the metal particles splashed from the metal surface of the fragments have a ver...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a combustion criterion analyzing method of a dry chamber near an oil tank under impact of metal chips. A relation diagram of changes of an airplane combustion envelope along with an airplane flight profile is calculated through a formula according to an airplane flight profile diagram and a formula of the fuel oil flash point temperature. A combustion triangular diagram is drawn by analyzing the influence relation between the temperature and a fuel oil combustion limit, the pressure and the fuel oil combustion limit, the height and the fuel oil combustion limit and the fuel oil components and the fuel oil combustion limit respectively and calculating the limit oxygen concentration of the fuel oil. Combustion criteria can judge conditions of combustion of the dry chamber near the oil tank under different flight heights accurately, expression forms of a fuel combustion envelope and a combustion triangular form are simple and intuitionistic so that the method is beneficial for reduction of probability of occurrence of airplane combustion explosion, viability of an airplane is improved, and meanwhile the method can be applied to judgment of combustion when oil tanks of communication media such as motorbikes, automobiles and steamships are impacted by high-speed metal chips.

Description

technical field [0001] The invention relates to the field of high survivability analysis and design of an aircraft fuel system, in particular to an analysis method for the occurrence conditions of an aircraft fuel tank being hit by high-speed metal fragments to cause fire and continuous combustion in a nearby dry compartment. Background technique [0002] Aircraft dry compartment refers to the compartment or cavity located between the outer skin of the aircraft and the internal structure. The dry compartment is usually distributed with hydraulic pipelines, fuel pipelines, avionics equipment and lines, etc. The combustion or explosion caused by the impact and penetration of high-speed metal fragments in the dry compartment usually leads to secondary damage to the surrounding structures. Such as fuel tank combustion or explosion, damage to avionics equipment, damage to load-bearing structures around the dry compartment, etc. These often result in the failure of the aircraft's...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G06F19/00
Inventor 葛玉雪宋笔锋裴扬蔡海亮石帅
Owner NORTHWESTERN POLYTECHNICAL UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap