Resonator Damping via Pre-Chamber Thermal Isolation

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Solution Overview

Problem

Existing devices for damping oscillations in combustion chambers, such as those in rocket engines, face issues with overheating of resonators due to direct exposure to hot combustion gases, leading to loss of resonance effect and potential damage to damping chambers.

Innovation Solution

The solution involves connecting resonators to a pre-chamber in a vibration-damping manner, which is then connected to the combustion chamber via passage channels, allowing the resonators to be located in areas with lower thermal stress, and using fuel flows for active cooling to maintain a constant temperature, thereby preventing direct contact with hot combustion gases.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If resonators are directly connected to the combustion chamber, then vibration damping is achieved, but the resonators overheat and lose resonance effect

Engineering Contradiction:

Improveresonance effectVSAvoidresonator temperature

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

A pre-chamber is introduced as an intermediary component between the combustion chamber and the resonators. The pre-chamber is connected to the combustion chamber via passage channels and provides a thermal buffer zone, allowing the resonators to be indirectly connected to the combustion chamber while maintaining vibration damping functionality without direct thermal exposure.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Temperature

If resonators are connected via passage channels to the combustion chamber, then thermal stress is reduced, but the structural complexity increases

Engineering Contradiction:

Improvethermal stress on resonatorsVSAvoidconstruction complexity

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

The pre-chamber and passage channels are integrated into the existing fuel distribution system architecture. The resonators are incorporated into the pre-chamber structure, and the passage channels are formed as part of the fuel distribution chamber design, merging multiple functions into unified structural elements to minimize additional complexity.

Inventive Principle:

Principle #5Merging (Combining)

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

This approach effectively dampens combustion chamber oscillations without the resonators being directly exposed to high temperatures, simplifying construction and maintaining resonance effectiveness throughout engine operation.

Implementation Method 1

at least one resonator is connected to a pre-chamber (7, 17) in a vibration-damping manner

Methodology Applied

Scientific EffectResonance: Resonance

Implementation Method 2

at least one of the fuel flows can be used to keep the temperature of the resonators largely constant through an active cooling of the resonators

Methodology Applied

Scientific EffectConvection: Convection

Data Source

PatentUS8033111B2Damping of vibration of a combustion chamber by resonators

Publication Date: 2011.10.11 ARIANEGRP GMBH

AI summary

Device for damping oscillations of a combustion chamber that includes at least one resonator connected to a pre-chamber in a vibration-damping manner. The pre-chamber is connected to a combustion chamber in a vibration-damping manner via at least one passage channel. This abstract is not intended to define the invention disclosed in the specification, nor intended to limit the scope of the invention in any way.