Fuel Nozzle Rotation Element Balances Flow and Reduces Acoustic Resonance
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Solution Overview
Problem
Conventional fuel nozzles with sharp bends suffer from uneven fuel flow distribution, leading to asymmetrical flames and combustion inefficiencies, as well as low-frequency acoustic resonance issues in combustion systems.
Innovation Solution
A rotation element with turning vanes is placed upstream of the sharp bend in the fuel nozzle, redirecting uneven flow into a balanced distribution and acting as a soft check valve to reduce pressure resistance and acoustic resonance, guided by the mathematical principle curl X curl X V=0 to minimize centrifugal forces and optimize flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a sharp bend is used in the fuel nozzle flow pathway, then the nozzle structure is simple, but uneven fuel flow distribution occurs due to centrifugal force differences between inner and outer radii
Solution Approach 1:
A rotation element is installed upstream of the sharp bend in the fuel nozzle flow pathway. This rotation element pre-rotates the fuel flow before it enters the bend, counteracting the centrifugal force effects that would otherwise cause uneven distribution. By performing this corrective action in advance, the sharp bend can be used without sacrificing flow distribution uniformity.
Solution Approach 2:
The rotation element acts as an intermediary device between the fuel source and the sharp bend. It transforms the fuel flow characteristics before the flow encounters the bend, mediating the interaction between the simple sharp bend structure and the requirement for uniform flow distribution.
2Device complexity
If conventional fuel nozzles with sharp bends are used, then the nozzle design is simple, but asymmetrical flames and combustion inefficiencies occur
Solution Approach 1:
The rotation element is positioned upstream to pre-condition the fuel flow before it reaches the sharp bend and exits the nozzle. This preliminary rotation ensures that the fuel is evenly distributed across the nozzle exit plane, preventing asymmetrical flame formation and improving combustion efficiency while keeping the rest of the nozzle design simple.
3Device complexity
If conventional fuel nozzles are used, then the system is simple, but low-frequency acoustic resonance occurs at subsonic flow conditions
Solution Approach 1:
The rotation element serves as an acoustic intermediary that disrupts the formation of low-frequency resonance patterns in the fuel flow. By introducing rotational motion and turbulence upstream, it breaks up coherent acoustic waves that would otherwise resonate at subsonic conditions, reducing harmful acoustic effects without significantly complicating the system.
4Device complexity
If uneven fuel flow distribution occurs, then no additional components are needed, but combustion deficiencies and accelerated wear of parts result
Solution Approach 1:
The rotation element is installed upstream to prevent combustion problems before they occur. By pre-rotating the fuel flow to achieve even distribution, it eliminates the root cause of combustion deficiencies and reduced component life, improving reliability with a single added component rather than requiring multiple corrective measures downstream.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves balanced fuel flow distribution and reduces undesirable acoustic resonance, enhancing combustion efficiency and extending the lifespan of combustion system components by ensuring even fuel delivery and minimizing low-frequency rumbling noise.
Implementation Method 1
Conventional fuel nozzles typically have an uneven fuel flow distribution which is caused by a higher centrifugal force near the inner radius of the bend than near the outer radius
Implementation Method 2
The soft check valve changes the acoustic characteristics of the nozzle body and reduces undesirable resonance which is often encountered in combustion systems at low subsonic flow conditions
Data Source
AI summary
A fuel nozzle having a flow pathway including a smooth, sharp, or mitered bend prior to a nozzle tip is provided. The fuel nozzle injects fuel into a combustion chamber with an even flow distribution of the fuel and substantially reduces undesirable acoustic resonance encountered in a fuel nozzle body in a combustion system.