Flow Balancing Valve for Multistage Combustor Fuel Injectors
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Solution Overview
Problem
In multistage combustor engines, clogged fuel injectors lead to non-uniform temperature distribution due to inadequate fuel flow balancing between fuel injectors, causing issues with the 'combustor pattern factor'.
Innovation Solution
A flow balancing valve with pressure feedback lines and metering lands that adjust the size of metering ports in response to pressure differentials, ensuring balanced fuel flow between fuel injectors by increasing the size of one metering port and decreasing the other when a pressure imbalance occurs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single fuel distribution line feeds multiple fuel injectors, then the device complexity is reduced, but the fuel flow balancing between injectors deteriorates when one injector becomes clogged
Solution Approach 1:
The patent implements pressure feedback lines that connect each burn line back to a common chamber. When one injector becomes clogged, the pressure differential detected by the feedback mechanism automatically adjusts the metering ports to balance fuel flow, creating a self-regulating system that maintains reliability without increasing overall system complexity
Solution Approach 2:
The patent introduces a common chamber as an intermediary element that receives pressure feedback from multiple burn lines and uses this information to regulate fuel flow distribution. This intermediary mechanism enables automatic flow balancing between injectors while maintaining a relatively simple fuel distribution architecture
2Device complexity
If metering port sizes are fixed, then the device complexity is reduced, but the ability to compensate for clogged injectors deteriorates
Solution Approach 1:
The patent employs dynamic metering ports with movable lands that can adjust their effective opening size based on pressure differential signals from the feedback lines. This dynamic adjustment capability allows the system to compensate for injector clogging events, and the mechanism achieves this adaptability through a relatively simple movable land structure rather than complex active control systems
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 valve effectively compensates for clogged fuel injectors by adjusting fuel flow, maintaining uniform temperature distribution across the combustor by increasing fuel flow to the affected injector and decreasing it to the other, thereby stabilizing the combustor pattern factor.
Implementation Method 1
An increase in pressure differential between the first line and the second line causes a compensatory movement in the metering land to balance fuel flow for the first fuel injector and the second fuel injector
Implementation Method 2
an increase of pressure in the first pressure feedback line with respect to pressure in the second pressure feedback line causes the first land to move the metering land away from the first metering port, thereby increasing the size of the first metering port
Data Source
Figure 1A~1B
Figure 2
Figure 3~4
AI summary
A flow balancing valve 44 for a multistage combustor 12 includes a first pressure feedback line 62A, a first burn line 56A, and a first metering port 60A fluidly connected to a first fuel injector 46A. The flow balancing valve 44 further includes a second pressure feedback line 62B, a second bum line 56B, and a second metering port 60B fluidly connected to a second fuel injector 46B. A metering land 66 is located between and defines sizes of the first metering port 60A and the second metering port 60B. An increase in pressure differential between the first pressure feedback line 62A and the second pressure feedback line 62B causes a compensatory movement in the metering land 66 to balance fuel flow for the first fuel injector 46A and the second fuel injector 46B.