Wave Rotor Combustor Isolation Section Shock Wave Suppression
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Solution Overview
Problem
Wave rotor combustors experience shock wave forward transmission due to high-pressure gas not being exhausted in time, leading to inconsistent operation and fuel intake issues.
Innovation Solution
An isolation section suppressing shock wave forward transmission structure is introduced, featuring a gas inlet port with a sealing disc, fan-shaped hole, and a pneumatic valve with hinged valve plates and a limiting structure, which adjusts flow resistance to prevent shock wave propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the wave rotor combustor operates at high pressure levels during constant volume combustion, then the thermal efficiency is improved, but shock wave forward transmission occurs when pressure deviates from design point conditions
Solution Approach 1:
The isolation section is installed in advance at the gas inlet port to prevent shock wave forward transmission before it can occur. This preliminary protective measure blocks the transmission path of shock waves from the combustion chamber to the gas inlet port, thereby maintaining operational stability while allowing high-pressure combustion to proceed.
Solution Approach 2:
The isolation section acts as an intermediary element between the combustion chamber and the gas inlet port. It mediates the pressure fluctuations and shock waves by providing a buffer zone that absorbs and dissipates the shock energy, preventing direct transmission to the fuel intake system while maintaining the high-pressure combustion environment.
2Stress or pressure
If high-pressure gas is not exhausted in time from the wave rotor channels, then the pressure gain is maintained, but shock wave forward transmission is formed and affects fuel intake process
Solution Approach 1:
The isolation section serves as an intermediary barrier that decouples the high-pressure combustion chamber from the fuel intake system. It allows pressure gain to be maintained in the combustion chamber while preventing shock waves from propagating to the fuel intake port, thus protecting the fuel intake process from disturbance.
Solution Approach 2:
The isolation section segments the combustion system into two distinct zones: the high-pressure combustion chamber and the low-pressure fuel intake system. This segmentation allows each zone to operate independently at its optimal pressure level, maintaining pressure gain in the combustion chamber while ensuring smooth fuel intake operation.
3Productivity
If the wave rotor combustor uses multiple combustion channels for pressurization and combustion, then the productivity is improved, but shock wave forward transmission causes inconsistent working of channels
Solution Approach 1:
The isolation section provides preliminary protection to all combustion channels by blocking the shock wave transmission path at the common gas inlet port. This prevents shock waves from causing inconsistent operation in any individual channel, thereby maintaining uniform and reliable operation across all channels while preserving the high productivity of multi-channel operation.
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 structure effectively suppresses shock wave transmission by altering flow channel areas and blockage ratios, ensuring stable operation of the wave rotor combustor even when deviating from design conditions.
Implementation Method 1
shock wave forward transmission is formed consequently
Implementation Method 2
adjusts flow resistance to prevent shock wave propagation
Data Source
AI summary
The present invention discloses an isolation section suppressing shock wave forward transmission structure for a wave rotor combustor and a wave rotor combustor, and belongs to the new concept field of unsteady combustion. The isolation section suppressing shock wave forward transmission structure for a wave rotor combustor includes a wave rotor and a gas inlet port, and the wave rotor is provided with several wave rotor channels. When the wave rotor rotates, the several wave rotor channels communicate with the isolation section sleeve sequentially through the fan-shaped hole. The present invention suppresses reflected shock waves by changing a flow blockage ratio and a shape of the pneumatic valve to consume back transmission pressure, which is beneficial to a fuel intake process, so that steady working of the wave rotor combustor in a state of deviating from a design point can be implemented.