Dual-mode ramjet engine with variable fuel injection

Patent metadata

Field	Value
Publication number	US-12188435-B2
Application number	US-202418609726-A
Country	US
Kind code	B2
Filing date	Mar 19, 2024
Priority date	Mar 20, 2023
Publication date	Jan 7, 2025
Grant date	Jan 7, 2025

Abstract

Disclosed is a dual-mode ramjet engine including: a combustor through which air flowing in from the front passes; a sliding injector configured to perform a sliding operation from an upper surface of the combustor along a height direction perpendicular to an air flow direction; and a cavity-type flame holder formed behind the sliding injector on the upper surface of the combustor and having a cavity that is concavely recessed, wherein the sliding injector includes: a plurality of fuel injection holes formed on both sides and configured to inject fuel; a fuel injection passage passing through the inside along the height direction to be opened downward, and configured to inject fuel; and a first sliding drive unit configured to drive the sliding injector to perform the sliding operation.

First claim

What is claimed is:

1. A dual-mode ramjet engine, comprising:
a combustor through which air flowing in from the front passes;
a sliding injector configured to perform a sliding operation from an upper surface of the combustor along a height direction perpendicular to an air flow direction; and
a cavity-type flame holder formed behind the sliding injector on the upper surface of the combustor and having a cavity that is concavely recessed.

2. The dual-mode ramjet engine of claim 1 , wherein the sliding injector comprises:
a plurality of fuel injection holes formed on both sides and configured to inject fuel;
a fuel injection passage passing through the inside along the height direction to be opened downward, and configured to inject fuel; and
a first sliding drive unit configured to drive the sliding injector to perform the sliding operation.

3. The dual-mode ramjet engine of claim 2 , wherein the plurality of fuel injection holes are installed to be spaced apart from each other along the height direction.

4. The dual-mode ramjet engine of claim 3 , further comprising:
a controller configured to control the sliding operation of the sliding injector and the injection of fuel,
wherein the controller is configured to adjust a position of fuel injected through the plurality of fuel injection holes through the sliding operation of the sliding injector to adjust a distribution of fuel injected into each of the combustor and the cavity-type flame holder.

5. The dual-mode ramjet engine of claim 4 , wherein the sliding injector further comprises:
a front-end portion formed in a portion facing the flow of air flowing in from the front and protruding to have a wedge shape whose lateral width in a left/right direction decreases toward the front.

6. The dual-mode ramjet engine of claim 4 , wherein the controller is configured to:
by partially developing the sliding injector into the combustor, move at least one fuel injection hole among the plurality of fuel injection holes to have a height adjacent to the upper surface of the combustor, and move a remaining fuel injection hole on a lower side to be exposed to the inside of the combustor.

7. The dual-mode ramjet engine of claim 4 , wherein the controller is configured to:
control the sliding injector to slide inward on the upper surface of the combustor to be retracted, and inject fuel through the fuel injection passage such that the fuel is injected from a position on the upper surface of the combustor.

8. The dual-mode ramjet engine of claim 4 , further comprising:
a sliding mixer configured to perform a sliding operation from the upper surface of the combustor along the height direction, behind the sliding injector,
wherein the controller is configured to:
slidably move the sliding mixer such that the sliding mixer overlaps behind the sliding injector based on the air flow direction, and induce a turbulent flow to be formed behind the sliding mixer.

9. The dual-mode ramjet engine of claim 8 , wherein the sliding mixer comprises:
a dispersion protrusion formed to protrude to have an inclination diverging from the flow direction toward the rear; and
a second sliding drive unit configured to drive the sliding mixer to perform the sliding operation.

10. The dual-mode ramjet engine of claim 9 , wherein the dispersion protrusion is provided as a plurality of dispersion protrusions spaced apart from each other along the height direction,
wherein the plurality of dispersion protrusions has a shape inclined leftward or rightward as it is developed toward the rear.

11. The dual-mode ramjet engine of claim 9 , wherein the sliding injector further comprises:
a first sliding guider installed on a portion facing the rear and coupled to the sliding mixer to be mutually slidably movable with respect to the sliding mixer at the rear,
wherein the sliding mixer further comprises:
a second sliding guider installed on a portion facing the front and coupled to the first sliding guider of the sliding injector to be mutually slidably movable with respect to the first sliding guider at the front.

12. A flying vehicle comprising:
a ramjet engine including:
a combustor through which air flowing in from the front passes;
a sliding injector configured to perform a sliding operation from an upper surface of the combustor along a height direction perpendicular to an air flow direction; and
a cavity-type flame holder formed behind the sliding injector on the upper surface of the combustor and having a cavity that is concavely recessed.

13. The flying vehicle of claim 12 , wherein the sliding injector comprises:
a plurality of fuel injection holes formed on both sides and configured to inject fuel;
a fuel injection passage passing through the inside along the height direction to be opened downward, and configured to inject fuel; and
a first sliding drive unit configured to drive the sliding injector to perform the sliding operation.

14. The flying vehicle of claim 13 , wherein the plurality of fuel injection holes are installed to be spaced apart from each other along the height direction.

15. The flying vehicle of claim 14 , the ramjet further comprising:
a controller configured to control the sliding operation of the sliding injector and the injection of fuel,
wherein the controller is configured to adjust a position of fuel injected through the plurality of fuel injection holes through the sliding operation of the sliding injector to adjust a distribution of fuel injected into each of the combustor and the cavity-type flame holder.

16. The flying vehicle of claim 15 , wherein the sliding injector further comprises:
a front-end portion formed in a portion facing the flow of air flowing in from the front and protruding to have a wedge shape whose lateral width in a left/right direction decreases toward the front.

17. The flying vehicle of claim 15 , wherein the controller is configured to:
by partially developing the sliding injector into the combustor, move at least one fuel injection hole among the plurality of fuel injection holes to have a height adjacent to the upper surface of the combustor, and move a remaining fuel injection hole on a lower side to be exposed to the inside of the combustor.

18. The flying vehicle of claim 15 , wherein the controller is configured to:
control the sliding injector to slide inward on the upper surface of the combustor to be retracted, and inject fuel through the fuel injection passage such that the fuel is injected from a position on the upper surface of the combustor.

19. The flying vehicle of claim 15 , the ramjet further comprising:
a sliding mixer configured to perform a sliding operation from the upper surface of the combustor along the height direction, behind the sliding injector,
wherein the controller is configured to:
slidably move the sliding mixer such that the sliding mixer overlaps behind the sliding injector based on the air flow direction, and induce a turbulent flow to be formed behind the sliding mixer.

20. A method of operating a dual-mode ramjet, the method comprising:
causing air from a front of the ramjet to flow through a combustor, the ramjet including a cavity-type flame holder arranged behind a sliding injector on an upper surface of the combustor and having a cavity that is concavely recessed; and
performing a sliding operation wherein the sliding injector slides from an upper surface of the combustor along a height direction perpendicular to an air flow direction, wherein performin

Assignees

• Agency Defense Dev

Inventors

• Bae Juhyun
• Jin Sangwook
• JEONG Haeseung
• Kwon Minchan
• Oh Seokjin

Classifications

• F23R3/22

  movable, e.g. to an inoperative position; adjustable, e.g. self-adjusting · CPC title

• F23R3/286

  having fuel-air premixing devices (F23R3/30 takes precedence) · CPC title

• F23R3/283

  Attaching or cooling of fuel injecting means including supports for fuel injectors, stems, or lances · CPC title

• F02K7/10 Primary

  characterised by having ram-action compression, i.e. aero-thermo-dynamic-ducts or ram-jet engines · CPC title