Fuel strut injector

Abstract

The invention discloses a fuel support plate injector, which uses the fuel of a scramjet engine and a combined cycle power engine as a coolant, the coolant flows in a cooling channel to cool the support plate, and is sprayed into a combustion chamber to be mixed with gas Combustion, realize the normal work of the support plate for a long time. The support plate has a rounded wedge-shaped front edge, and the flow channel is located inside the front edge of the support plate; there are multiple sets of channel inlets on the inside of the front part of the support plate and the inside of the rear wall of the support plate, and there are multiple sets of fuel injection holes on the side wall of the support plate. Located at the bottom of the support plate and connected with the flow channel and the cooling channel, the coolant enters the entrance of the channel, flows along the channel to the bottom of the support plate and collects in the liquid collection chamber, and is sprayed out of the support plate through the fuel injection hole; the coolant is sprayed into the combustion chamber Previously, the flow heat exchange method of forced convection absorbs heat inside the channel, reduces the temperature of the support plate and realizes fuel preheating at the same time. The strut injector has a simple structure, has good heat protection effect on the strut, and can realize the function of injecting fuel to the strut.

Description

technical field [0001] The invention relates to the fields of scramjet engines and combined cycle power engines, in particular to a fuel branch injector with a cooling structure. Background technique [0002] Engine combustion efficiency is closely related to the mixing effect of fuel and air; in order to increase the injection depth of fuel in the high-speed incoming flow, the injected fuel can be more evenly distributed in the mainstream gas of the combustion chamber, and the Mixing efficiency of air, usually using fuel rail injectors. However, the strut plate injector bears extremely high heat load in the engine, especially the front edge of the strut plate, which is very easy to be burned during operation. For the thermal protection of the support plate, the conventional method is to use high-temperature-resistant metal materials and use the material heat sink for passive thermal protection, but the thermal environment of the support plate is extremely harsh, and the te...

AI Technical Summary

Problems solved by technology

However, the strut injector bears extremely high heat load in the engine, especially the leading edge of the strut, which is easily burned during operation

For the thermal protection of the support plate, the conventional method is to use high-temperature-resistant metal materials and use the material heat sink for passive thermal protection, but the thermal environment of the support plate is extremely harsh, and the temperature at the front edge of the support plate in the scramjet engine can reach about 3000K, exceeding The use limit of most existing metal materials, the support plate using metal heat sink cannot work normally for a long time

[0003] The traditional support plates that use high-temperature-resistant materials for passive thermal protection are expensive, and it is currently difficult to find materials that can withstand high temperatures, high heat flow, and thermal environments in the engine for a long time; patent 200910236121. "structure", using the low-temperature gas ejected from the slit at the front edge of the support plate to form a low-temperature gas film on the surface of the support plate to protect the support plate from heat, but the structure of the support plate is relatively complicated and the processing technology is difficult; in the patent 201310561173.6, a A "thermal protection method for scram engine injection struts by sweating and impingement cooling", according to the characteristics of porous media, using fuel as a coolant, combined with the concept of impingement cooling, to achieve the thermal protection effect on injection struts

However, the structure of the support plate is complex, and the porous structure is easy to generate large flow resistance, which has high requirements on the fuel supply system, which is not conducive to fuel injection and mixed combustion

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