Air Intake Bypass Recirculation Structure for Turbocharged Engine Noise Control

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Solution Overview

Problem

Turbocharged engines experience excessive noise due to aerodynamic noise from the air compressor, which poses a risk to equipment operation and worker safety, with limited solutions available to reduce noise through structural changes in the air intake pipe.

Innovation Solution

An air intake bypass recirculation structure with adjustable air entraining amount and controllable broadband noise is introduced, featuring an annular valve and intra-cavity airflow baffles that adjust airflow circulation area and noise wave interference to reduce noise levels.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If the aerodynamic noise of the air compressor is reduced by adding mufflers, then the noise level is lowered, but the device complexity and space requirements increase

Engineering Contradiction:

Improvenoise levelVSAvoiddevice complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent combines the noise reduction function with the existing air intake bypass recirculation structure. The airflow baffle is integrated into the bypass recirculation cavity, merging noise control with airflow management functions in a single integrated component, thereby reducing device complexity while achieving noise reduction.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The airflow baffle structure serves multiple functions: it controls airflow circulation in the bypass recirculation system and simultaneously reduces aerodynamic noise through wave interference. This multi-functional design eliminates the need for separate mufflers, reducing overall device complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Object-affected harmful factors

If the aerodynamic noise of the air compressor is reduced by adding mufflers, then the noise level is lowered, but the space requirements and installation complexity increase

Engineering Contradiction:

Improvenoise levelVSAvoidspace requirements

Core Design Contradiction:

Object-affected harmful factorsVSArea of stationary object

Solution Approach 1:

The noise reduction function is merged into the existing bypass recirculation cavity structure. The airflow baffle utilizes the available space within the bypass recirculation system, eliminating the need for additional external mufflers and reducing overall space requirements.

Inventive Principle:

Principle #5Merging (Combining)

3Productivity

If the air intake bypass recirculation structure is used to widen the flow range, then the compressor efficiency is improved, but the aerodynamic noise increases

Engineering Contradiction:

Improvecompressor efficiencyVSAvoidaerodynamic noise

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent converts the harmful aerodynamic noise generated by the bypass recirculation airflow into a beneficial effect by using wave interference principles. The airflow baffle creates controlled interference patterns that cancel out noise waves, transforming the noise-generating airflow into a noise-reducing mechanism while maintaining the efficiency benefits of bypass recirculation.

Inventive Principle:

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

Solution Approach 2:

The airflow baffle is designed with adjustable features that allow optimization of both airflow circulation for efficiency and noise reduction performance. The dynamic adjustment capability enables the system to maintain compressor efficiency while controlling aerodynamic noise across different operating conditions.

Inventive Principle:

Principle #15Dynamics

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 reduces noise by adjusting airflow and noise wave interference, maintaining stable operation while minimizing noise, thus enhancing the operational safety and efficiency of turbocharged engines.

Implementation Method 1

an air intake bypass recirculation structure with adjustable air entraining amount and controllable broadband noise is provided

Methodology Applied

Scientific EffectWave interference: Interference

Data Source

PatentUS11946485B2Air intake bypass recirculation structure with adjustable air entraining amount and controllable broadband noise

Publication Date: 2024.04.02 HARBIN ENG UNIV

AI summary

Some embodiments of the disclosure provide an air intake bypass recirculation structure with adjustable air entraining amount and controllable broadband noise which includes main body of the air intake bypass recirculation structure and an air entraining amount adjusting structure. In some examples, an air intake bypass recirculation cavity is formed in the main body of the air intake bypass recirculation structure. An air inlet of an air intake pipe and an air outlet of the air intake pipe are formed in two ends of the main body of the air intake bypass recirculation structure respectively. An airflow inlet of the air intake bypass recirculation structure and an airflow outlet of the air intake bypass recirculation structure are formed in the inner side of the main body of the air intake bypass recirculation structure. The air entraining amount adjusting structure is arranged in the air intake bypass recirculation cavity.