Turbocharger Flow-Guiding Element Reduces Pressure Losses
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Solution Overview
Problem
Turbochargers experience pressure losses and undesired flow noises due to the integration of a diffuser with multiple flow openings in the inlet region, which leads to turbulence and inefficiencies in charge air flow.
Innovation Solution
A flow-guiding element is placed upstream of the flow openings in the feed duct to create a region of reduced pressure, forming a flow dead zone that prevents direct airflow past the openings, thereby reducing turbulence and pressure losses, and the flow openings are arranged circumferentially to ensure uniform airflow distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a diffuser with multiple flow openings is integrated in the inlet region, then the bypass duct can be connected to the feed duct, but pressure losses and turbulence occur in the charge air flow
Solution Approach 1:
A flow-guiding element is introduced as an intermediary component between the charge air flow and the flow openings. This element creates a flow dead zone that mediates the interaction, preventing direct turbulent flow through the openings while still allowing bypass connection functionality.
Solution Approach 2:
The flow dead zone is created locally at the flow openings by the flow-guiding element, concentrating the flow control function specifically at this location rather than modifying the entire feed duct system. This localized approach minimizes overall pressure losses.
2Adaptability or versatility
If a diffuser with multiple flow openings is integrated in the inlet region, then the bypass duct can be connected to the feed duct, but flow noises are generated
Solution Approach 1:
The flow-guiding element acts as a mediator that eliminates direct flow through the openings, which is the source of noise. By creating a flow dead zone, it prevents the turbulent flow that generates unwanted noise while maintaining the bypass connection.
Solution Approach 2:
The flow-guiding element converts what would be a harmful turbulent flow through the openings into a beneficial flow dead zone. The turbulence that would cause noise is transformed into a controlled low-pressure region that actually improves overall flow characteristics.
3Productivity
If charge air flows directly past the flow openings, then the bypass connection is functional, but turbulence and pressure losses occur
Solution Approach 1:
The flow-guiding element performs preliminary action by creating the flow dead zone before charge air can reach the flow openings. This preemptive measure prevents direct flow and turbulence from occurring in the first place, rather than attempting to correct the problem after it arises.
Solution Approach 2:
The flow-guiding element changes the pressure parameter locally at the flow openings by creating a flow dead zone with reduced pressure. This parameter change redirects the charge air flow away from the openings, eliminating turbulence while maintaining bypass functionality.
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 solution effectively minimizes pressure losses and eliminates flow noises by creating a flow dead zone at the flow openings, ensuring efficient and quiet operation of the turbocharger.
Implementation Method 1
a flow-guiding element is situated in the feed duct upstream of the at least one flow opening in the flow direction, which flow-guiding element is formed and/or arranged such that an area of reduced pressure—in relation to the normal pressure of the charge air in a central region of the feed duct in the inlet region—forms at the flow opening during operation
Data Source
AI summary
In order for charge air to be conducted with the lowest possible losses in pressure in a turbocharger including a blow-off valve, a flow-guiding element in an inlet region is designed such that neutral zones are formed at the flow openings. The flow openings recirculate charge air from the pressure side to the suction side when the blow-off valve is opened. The flow-guiding element avoids vortices and therefore losses in pressure in the region of the flow openings.