Rotating Detonation Combustion Chamber Wave Control Assembly

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Solution Overview

Problem

The complex mode of rotating detonation waves in combustion chambers leads to reverse secondary waves, resulting in double wave collisions that reduce effective total pressure gain.

Innovation Solution

An assembly with an inner barrel, outer plate, and sectoral direction-changing blocks forms a Tesla valve-like structure, guiding reverse secondary waves into straight and arc channels to align their direction with the original wave, reducing collisions and enhancing pressurization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If a detonation wave rotates in a certain direction in the annular combustion chamber, then detonation combustion occurs with high heat release intensity, but reverse rotating secondary waves are generated that collide with the original wave, reducing effective total pressure gain

Engineering Contradiction:

Improveheat release intensityVSAvoideffective total pressure gain

Core Design Contradiction:

PowerVSLoss of energy

Solution Approach 1:

The patent converts the harmful reverse rotating secondary wave into a beneficial component by using the Tesla valve structure to redirect it. The secondary wave that would normally collide and reduce pressure gain is instead guided through the Tesla valve's unidirectional conductivity to rotate in the same direction as the primary detonation wave, transforming a harmful collision into a constructive addition that enhances overall pressure gain.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The Tesla valve structure acts as an intermediary device between the primary detonation wave and the secondary wave. It mediates the interaction by selectively allowing the secondary wave to pass through its unidirectional channels while blocking reverse flow, thereby controlling the direction and interaction of the two waves to prevent harmful collisions.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If the detonation wave mode is allowed to be complex with reverse secondary waves, then the combustion process is more complete, but double wave collisions occur that reduce effective pressurization

Engineering Contradiction:

Improvecombustion efficiencyVSAvoideffective pressurization

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent transforms the potentially harmful secondary waves into beneficial contributors to combustion efficiency. By using the Tesla valve to redirect secondary waves into the same rotation direction as the primary wave, the system maintains complex wave interactions that enhance combustion completeness while eliminating the harmful collision effects that would reduce pressurization reliability.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 configuration effectively reduces detonation wave collisions, improving the effective pressurization by ensuring the secondary waves rotate in the same direction as the original wave, thereby increasing the overall combustion efficiency.

Implementation Method 1

due to unidirectional conductivity of a Tesla valve, the secondary wave enters the straight inlet channel and the arc direction-changing channel where it is subjected to direction changing

Methodology Applied

Scientific EffectTesla valve unidirectional conductivity: Tesla Valvular Conduit

Implementation Method 2

A detonation wave is composed of a leading shock wave and a reaction zone immediately following it. The leading shock wave compresses and ignites a reactant to release a large amount of energy

Methodology Applied

Scientific EffectDetonation: Detonation

Implementation Method 3

The leading shock wave compresses and ignites a reactant

Methodology Applied

Scientific EffectShock wave compression: Shock Wave

Data Source

PatentUS11781754B2Assembly for controlling detonation wave mode of rotating detonation combustion chamber

Publication Date: 2023.10.10 AIR FORCE UNIV PLA

AI summary

The application relates to an assembly for controlling detonation wave mode of a rotating detonation combustion chamber, which includes an inner barrel, an outer plate and at least one sectoral direction-changing block. The outer plate is sleeved outside the inner barrel. An annular cavity is formed between the outer plate and the inner barrel. At least one groove is arranged on one side of the outer plate close to the inner barrel. The groove wall comprises an arc edge and a straight edge. The groove is connected with the annular cavity. The sectoral direction-changing blocks are arranged in the grooves in one-to-one correspondence. An arc edge of the sectoral direction-changing block is positioned far away from the inner barrel.