Gas Turbine Bleed Valve Modulation Delay Detection
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Solution Overview
Problem
Current techniques are inadequate for detecting malfunctions in bleed valves of gas turbine engines, particularly modulation delays that can lead to sudden power increases and increased likelihood of engine surge.
Innovation Solution
A method and system that determine the rate of change of gas generator speed and engine power parameters, compare these ratios to predefined ranges, and detect modulation delays in bleed valves, transmitting a signal indicative of a malfunction when the ratios fall within specific ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current monitoring techniques are used for bleed valves, then the system structure remains simple, but the detection accuracy of valve malfunctions is insufficient
Solution Approach 1:
The patent replaces direct mechanical monitoring of the bleed valve with an indirect parameter-based detection system. Instead of mechanically sensing valve position or internal valve conditions, the system uses sensors to measure engine operating parameters (gas generator speed, engine power) and processes these parameters to detect valve malfunction patterns, thereby achieving high detection accuracy without complex mechanical monitoring infrastructure
Solution Approach 2:
The patent introduces engine operating parameters (gas generator speed, engine power) as intermediary indicators to indirectly monitor bleed valve status. These parameters serve as mediators between the actual valve condition and the detection system, allowing malfunction detection through parameter analysis rather than direct valve sensing, thus maintaining system simplicity while improving detection accuracy
2Reliability
If bleed valve malfunctions are not detected timely, then the system operation remains continuous, but sudden power increases and engine surge occur
Solution Approach 1:
The patent implements preliminary detection of bleed valve malfunctions by continuously monitoring engine operating parameters and identifying characteristic patterns before actual damage occurs. The system detects modulation delays and abnormal valve behavior in advance, allowing preventive action to be taken before sudden power increases or engine surge occur, thereby ensuring continuous reliable operation
Solution Approach 2:
The patent establishes a feedback mechanism where engine operating parameters are continuously monitored, analyzed for valve malfunction patterns, and used to trigger alerts or corrective actions. This closed-loop feedback system enables real-time detection of valve issues and timely response to prevent harmful effects such as sudden power increases and engine surge, maintaining high operational reliability
Data Source
AI summary
There are described methods, systems, and assemblies for monitoring a bleed valve of a gas turbine engine. The method comprises determining a rate of change of a gas generator speed of the gas turbine engine; determining a rate of change of a parameter indicative of engine power of the gas turbine engine; comparing at least one ratio based on the rate of change of the gas generator speed and the rate of change of the parameter indicative of engine power to at least one range of values; detecting a modulation delay of the bleed valve when the at least one ratio is within the at least one range of values; and transmitting a signal indicative of the bleed valve malfunction in response to detecting the modulation delay.