Thermal protection method of porous medium jetting support plate leading edge nose cone

Abstract

The invention relates to a thermal protection method of a porous medium jetting support plate leading edge nose cone. The thermal protection method comprises the following steps that firstly, a narrow seam is formed in the jetting support plate leading edge nose cone, a front cavity of a jetting support plate is communicated with one fuel pipe, and a back cavity of the jetting support plate is communicated with the other fuel pipe; secondly, most of low-temperature fuel is quickly sprayed out of the narrow seam through the fuel pipe arranged at the front cavity, and the rest part of fuel permeates to the surface of the front cavity in a sweating mode; thirdly, the fuel sprayed to the leading edge is collected through the narrow seam, and produced detached shock waves are pushed away from the leading edge nose cone; fourthly, a thick protection air film is formed at the leading edge nose cone through the fuel sprayed out of the narrow seam and under the action of high-speed main stream, the thick protection air film is fused with a compact air film formed on the surface of the jetting support plate in a sweating and cooling mode, and thermal protection for the jetting support plate is enhanced. According to the thermal protection method, due to the fact that the fuel is sprayed to the high-speed main stream through the narrow seam at the leading edge nose cone, the low-temperature fuel serves as coolant for reducing the temperature of the leading edge nose cone when sprayed out of the narrow seam, meanwhile the sprayed fuel can form the protection air film on the surface of the jetting support plate, and the protection air film can conduct effective thermal protection on the jetting support plate.

Description

technical field [0001] The invention relates to a thermal protection method for injection struts of scram engines, in particular to a thermal protection method for the nose cone of the front edge of porous media injection struts in high-temperature and high-speed airflow. Background technique [0002] In the scramjet combustion chamber, fuel and supersonic air are mixed and burned to obtain thrust so that the aircraft can fly at supersonic speed. However, because the fuel is injected into the supersonic airflow, the residence time of the fuel in the combustion chamber is only a few milliseconds, which may cause insufficient mixing and even lead to the occurrence of ignition failure problems. Therefore, the injection support plate is installed in the scramjet combustion chamber The fuel is directly injected into the core area of ​​the main flow through the injection support plate, which can effectively enhance the mixing between the fuel and the main flow and improve the comb...

AI Technical Summary

Problems solved by technology

In particular, the stagnation temperature at the nose cone at the front edge of the injection strut is extremely high, which can easily cause local ablation and cause damage to the injection strut, resulting in major safety issues such as engine flameout

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