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Scramjets and associated aircraft and methods

A jet engine and ramjet technology, applied in ramjet engines, engine functions, machines/engines, etc., can solve problems such as slow diffusion, fuel waste, and inefficient mixing of fuel and air

Active Publication Date: 2019-02-12
THE BOEING CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, diffusion is usually a relatively slow process, producing inefficient mixing of fuel and air during the time frame of air passing through the combustion chamber
thus, inefficient mixing of fuel and air can lead to loss of potential thrust and / or waste of fuel

Method used

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  • Scramjets and associated aircraft and methods
  • Scramjets and associated aircraft and methods
  • Scramjets and associated aircraft and methods

Examples

Experimental program
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Embodiment approach

[0124] Clause 1. A scramjet engine comprising:

[0125] configured as a converging inlet for compressed intake airflow;

[0126] A combustor comprising a combustor located downstream of a converging inlet, wherein the combustor is configured to introduce a flow of fuel into an airflow in the combustor to generate a flow of a fuel-air mixture, and to ignite and combust the flow of fuel-air mixture to generate an exhaust flow, wherein combustion The burner includes a fuel injection system comprising at least one arc injection engine configured to inject a flow of fuel into the airflow in the combustion chamber at a fuel velocity sufficient to create shear between the flow of fuel and the airflow; with

[0127] A diffuse exit nozzle located downstream of the combustion chamber and configured to accelerate the exhaust flow to generate scramjet thrust.

[0128] Clause 2. The scramjet engine according to Clause 1, wherein the air velocity of the intake flow is supersonic.

[0129...

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Abstract

The invention relates to a scramjets and associated aircraft and methods. The scramjet includes a converging inlet, a combustor configured to introduce a fuel stream into an air stream in a combustionchamber and to combust the fuel air mixture stream to create an exhaust stream, and a diverging exit nozzle configured to accelerate the exhaust stream. The combustor includes a fuel injection systemincluding at least one arcjet. A method of creating thrust for an aircraft includes compressing a supersonic incoming air stream in a converging inlet, injecting a fuel stream into the air stream ina combustion chamber to create a fuel air mixture stream, igniting the fuel air mixture stream to create an exhaust stream, and exhausting the exhaust stream from a diverging exit nozzle. The injecting the fuel stream into the air stream includes injecting the fuel stream at a fuel speed sufficient to create shear between the fuel stream and the air stream.

Description

technical field [0001] The present disclosure relates to scramjets. Background technique [0002] A ramjet engine is an air-breathing jet engine that uses the forward motion of the engine to compress intake air in a combustion chamber without an axial compressor. A supersonic combustion ramjet, also known as a scramjet, is a ramjet engine in which combustion occurs in a supersonic flow of a fuel-air mixture. The use of supersonic combustion can yield higher levels of performance at increased Mach numbers relative to what can be achieved with subsonic combustion, as in ramjet or turbojet engines. A major engineering constraint in the design of a scramjet relates to the short time available to ignite and complete combustion of the fuel-air mixture. For example, a scramjet engine may be of such a length and may be configured to operate at a velocity at which air passes through a scramjet combustor for a period of time on the order of 1 millisecond (ms). If fuel is injected i...

Claims

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Application Information

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IPC IPC(8): F02K7/14F23R3/28
CPCF02K7/14F23R3/28F23K5/08F23R7/00F23D11/32F05D2220/80F05D2260/99F23K2300/101B64D27/16F23R3/02F05D2240/35F05D2240/128
Inventor J·R·赫尔J·A·格罗斯尼克D·尼基克K·G·鲍克特
Owner THE BOEING CO
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