Flame Transfer Function Measurement System Phase Correction
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Solution Overview
Problem
Existing flame transfer function measurement systems require a cumbersome process to rearrange phases measured at each perturbation frequency, making it difficult to express the phase in a function form suitable for existing combustion instability prediction programs.
Innovation Solution
A flame transfer function measurement system that automatically corrects the phase of the flame transfer function at each frequency, allowing for the calculation and expression of the flame transfer function in a form compatible with existing prediction programs, while maintaining constant external excitation intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the phase of the flame transfer function is calculated through the phase difference between experimentally measured heat release rate perturbation and velocity perturbation, then the flame transfer function can be obtained, but the phase requires a cumbersome manual process to add or subtract 2nπ to rearrange it into a function form suitable for prediction programs
Solution Approach 1:
The system automatically performs the phase rearrangement process by adding or subtracting 2nπ without requiring manual intervention. The calculation unit autonomously processes the experimentally measured phase difference and converts it into the required function form, making the system self-sufficient and eliminating the cumbersome manual operation step.
Solution Approach 2:
The manual mechanical process of phase rearrangement is replaced by an automated calculation system. The calculation unit uses computational algorithms to automatically adjust the phase values by adding or subtracting 2nπ, substituting the manual operational method with an automated computational approach.
2Quantity of substance
If the flame transfer function is measured at multiple perturbation frequencies, then comprehensive flame characteristics can be obtained, but the phase data from each frequency requires individual manual adjustment to express in a unified function form
Solution Approach 1:
The calculation unit automatically processes phase data from all perturbation frequencies simultaneously, performing the necessary 2nπ adjustments for each frequency point without requiring manual intervention. This self-service capability handles the entire frequency range comprehensively and efficiently.
Solution Approach 2:
The system is designed to automatically perform phase rearrangement as part of the initial measurement process. By incorporating the automated phase adjustment capability into the measurement system itself, the phase data is immediately converted into the required function form, eliminating subsequent manual processing time.
3Adaptability or versatility
If the external excitation intensity is varied during measurement, then different operating conditions can be studied, but the phase of the flame transfer function cannot be kept constant across different frequencies
Solution Approach 1:
The system measures the actual phase difference between heat release rate perturbation and velocity perturbation at each frequency and uses this feedback information to automatically calculate the appropriate 2nπ adjustment. This feedback mechanism ensures that the phase is correctly normalized even when external excitation intensity varies, maintaining phase consistency across different measurement conditions.
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
Enables quick grasping of the phase tendency from the flame transfer function and allows prediction of combustion instability by automatically rearranging phases into a suitable function form for existing prediction programs.
Implementation Method 1
a self-luminescence measurement part that is disposed at an outer side of the combustion part, and that measures a radical self-luminescence signal discharged from the flame
Data Source
AI summary
The present disclosure relates to a flame transfer function measurement system for prediction and reduction of combustion instability.