Inlet Diffuser for Two-Stage Charge Air System
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Solution Overview
Problem
Conventional approaches fail to effectively package a two-stage engine charge air system within the limited space of a VEE configuration, particularly in mounting additional turbochargers and aftercoolers, which complicates maintenance access and efficient air distribution.
Innovation Solution
A two-stage engine charge air system is designed with a low-pressure turbocharger and intercooler, a high-pressure turbocharger, and aftercooler, each with an inlet diffuser configured to distribute air efficiently across their respective outlets, utilizing tapered walls and fins to secure and distribute air within the VEE, allowing for optimal placement and access within the engine compartment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If additional turbochargers and aftercoolers are mounted within the VEE to achieve two-stage charging, then engine performance is improved, but space constraints and packaging difficulty worsen
Solution Approach 1:
The inlet diffuser is integrated into the intercooler housing, with the diffuser forming an internal cavity that couples to the low-pressure turbocharger outlet. This nesting arrangement allows multiple components (diffuser, intercooler, turbocharger) to occupy overlapping spatial volumes, enabling two-stage charging system functionality within the limited VEE space without requiring separate mounting areas for each component.
Solution Approach 2:
The inlet diffuser and intercooler are merged into a single integrated assembly where the diffuser outlet opening is formed within the intercooler housing. This combining of functions reduces the total number of separate components and mounting locations required, thereby saving space within the VEE while maintaining two-stage charging capability.
2Adaptability or versatility
If more components are mounted along the sides of the engine, then functionality is increased, but maintenance access difficulty worsens
Solution Approach 1:
Instead of mounting components along the side of the engine where access is restricted, the inlet diffuser and intercooler assembly is positioned within the VEE space above the crankshaft centerline. This spatial relocation to a different dimension (vertical space above crankshaft rather than lateral space along sides) provides improved maintenance access while maintaining the two-stage charging functionality.
3Device complexity
If conventional mounting approaches are used, then simplicity is maintained, but air distribution efficiency worsens
Solution Approach 1:
The inlet diffuser incorporates tapered side walls that transition from a larger inlet area to a smaller outlet area, creating a gradual expansion section. This local geometric modification optimizes air flow characteristics and reduces turbulence at the diffuser outlet, thereby improving air distribution efficiency into the intercooler without significantly increasing overall system complexity.
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 enables efficient air distribution and cooling within the VEE, improving engine performance and maintenance accessibility by optimizing the placement and functionality of turbochargers and aftercoolers, reducing space constraints and flow losses.
Implementation Method 1
the inlet diffuser being configured to distribute air across an outlet opening of the inlet diffuser for delivery to a housing of the intercooler
Implementation Method 2
an intercooler mounted within the VEE and coupled to the low pressure turbocharger to cool compressed air from the low pressure turbocharger
Implementation Method 3
an aftercooler mounted within the VEE and coupled to the high pressure turbocharger to cool compressed air from the high pressure turbocharger
Data Source
AI summary
An aftercooler is provided comprising a housing, an outlet diverter coupled to the housing and having an outlet port, and an inlet diffuser comprising a forward wall having a peripheral rim coupled to the housing, an upper wall connected to the forward wall, a lower wall connected to the forward wall, a first side wall connected to the upper wall and the lower wall and having a first end disposed adjacent the peripheral rim and a second end disposed adjacent an inlet port of the inlet diffuser, a second side wall connected to the upper wall and the lower wall and having a first end disposed adjacent the peripheral rim and a second end disposed adjacent the inlet port, and a plurality of fins disposed within an interior volume of the inlet diffuser collectively distributing air across an outlet opening of the inlet diffuser for delivery to the housing.