Fuel Injector Duct Structure for Engine Combustion Optimization
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Solution Overview
Problem
Modern combustion engines face challenges in fuel and air mixing within the combustion chamber, leading to inadequate combustion and increased soot formation due to inefficient fuel injector duct structures.
Innovation Solution
A duct structure for fuel injectors comprising a first ring structure, plurality of ducts, posts, and an engagement structure, which is coupled to the cylinder head and aligns with the fuel injector orifices to ensure efficient fuel distribution and mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a conventional fuel injector structure is used without a duct structure, then the device complexity is low, but the fuel and air mixing is inadequate leading to increased soot formation
Solution Approach 1:
The duct structure is segmented into multiple individual ducts (e.g., three ducts) that correspond to multiple orifices in the fuel injector. Each duct is a separate component that channels fuel from a specific orifice, allowing independent optimization of each fuel jet's path and mixing characteristics while collectively reducing soot formation through improved overall fuel-air mixing.
2Productivity
If the duct structure is added to improve fuel mixing, then the fuel mixing efficiency is improved, but the device complexity increases
Solution Approach 1:
Multiple functional elements are merged into a single integrated duct structure assembly. The ducts are combined with support structures, positioning mechanisms, and mounting features into one unified component that can be installed as a single unit. This merging reduces the number of separate parts and assembly steps while maintaining the improved fuel mixing efficiency that would require multiple individual duct components.
3Manufacturing precision
If the duct structure is designed with precise alignment features, then the manufacturing precision is improved, but the device complexity increases
Solution Approach 1:
Alignment features such as positioning protrusions and corresponding recesses are incorporated into the duct structure design before assembly. These preliminary alignment features are built into the mold or casting process, ensuring that when the duct structure is installed, the ducts are automatically positioned correctly relative to the orifices without requiring complex adjustment or alignment procedures during assembly. This preliminary action achieves high manufacturing precision while keeping the engagement structure relatively simple.
Data Source
AI summary
A duct structure for a fuel injector assembly of an engine includes a first ring structure, a plurality of ducts, a plurality of posts, and an engagement structure. The fuel injector assembly includes a fuel injector having a plurality of orifices to discharge fuel. The first ring structure is configured to be coupled to a cylinder head of the engine, and defines a central axis. The ducts are circularly arrayed around the central axis, and are configured to provide passages to the fuel discharged from the fuel injector. The posts connect the ducts to the first ring structure. Further, the engagement structure is configured to engage with the fuel injector to align the ducts with the orifices such that each of the plurality of ducts is configured to receive fuel discharged from a corresponding one of the plurality of orifices.