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Hybrid variable area fuel injector with thermal protection

A fuel injector and injector technology, applied in the direction of fuel injection device, burner, injection device, etc., can solve the problems of decreased effectiveness and decreased combustion efficiency.

Inactive Publication Date: 2014-01-01
WOODWARD FST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

therefore, failure of the single structural end due to coking could potentially result in reduced combustion efficiency and reduced effectiveness of the ramjet propulsion engine in achieving its overall mission objectives

Method used

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  • Hybrid variable area fuel injector with thermal protection
  • Hybrid variable area fuel injector with thermal protection
  • Hybrid variable area fuel injector with thermal protection

Examples

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Embodiment Construction

[0030] figure 1 is a perspective view of a hybrid variable area fuel injector 100 (injector 100 ) in accordance with an embodiment of the present invention. Injector 100 is used to meter and inject fuel into the combustion chamber of the engine. As will be described, injector 100 is hybrid in that it operates with fixed area ports during low flow and high flow operation and utilizes variable area ports only during high flow operation. This allows the injector 100 to address poor continuity of fuel flow characteristics during low flow conditions, while still providing variable area ports during high flow conditions.

[0031] figure 2 Injector 100 is shown in cross-section in a low flow state during which fuel 101 (shown by arrow 101 ) flows through fixed area port 102 . The fixed area port 102 is provided by a single structure leader 104 (leader 104 ). However, not all designs require a single structure leader. The size of the port (through which fuel is dispensed from th...

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PUM

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Abstract

A hybrid variable area fuel injector is provided. The fuel injector includes a main body portion and a head portion carried by the main body portion. The fuel injector defines a fixed area port provided by the head portion for use during low flow conditions. The fuel injector defines a variable area port for use during high flow conditions. The variable area port is provided between the main body portion and the head portion. The area of the variable area port is adjustable due to the position of the head portion relative to the main body portion. The fuel injector also includes a shield portion surrounding at least a portion of the head portion. The shield portion reduces the amount of cross-flow that impinges on the head portion to reduce heat transfer to the head portion.

Description

technical field [0001] The present invention relates generally to fuel injectors, and more particularly to variable area fuel injectors. Background technique [0002] Variable area fuel injectors (VAFI’s) have been widely used in ramjet applications, such as high-speed missiles, and are very useful for realizing high-efficiency ramjet engines. This is because it provides the necessary large fuel operating resiliency (FTDR - maximum to minimum fuel flow) and improved injection characteristics that are ramjet takeover after accelerator start, high altitude cruise and powered dive / very low flight entry performance requirements. Because of the large FTDR, VAFI's also minimize the number of standard fuel injectors (i.e., orifice or single structure), fuel valves, manifolds, and improve ramjet performance and reduce overall fuel system cost and risk. [0003] The use of VAFI's offers the advantage of good atomization over a much wider range of fuel flow rates. Also, a fuel pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M61/18F02M51/06F02M61/16F02K7/10
CPCB05B1/323B05B1/3415B05B1/3013F23D11/26F23D11/38F23D2900/00018
Inventor P·G·希克斯R·J·佩德森
Owner WOODWARD FST
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