Pre-chamber Nozzle Chamber Enlargement for Combustion Durability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The durability of pre-chamber nozzle chambers and orifices in combustion engines is compromised due to high temperatures, leading to hot corrosion and manufacturing challenges, particularly in the narrow channels connecting the pre-chamber to the main combustion space.
Innovation Solution
Enlarging the nozzle chamber diameter at the orifice positions, shaping it as a truncated cone with a coning angle less than 15 degrees, and rounding the edges to increase distance between orifices and facilitate machining, while ensuring smooth flow technology.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the nozzle chamber is made narrow to reduce overall size, then the combustion reaction progress is improved, but the durability of the nozzle chamber and orifices deteriorates due to high temperatures and hot corrosion
Solution Approach 1:
The nozzle chamber is divided into two distinct parts: a first part with a smaller diameter for combustion reaction progress and a second part with a larger diameter for durability and ease of machining. This segmentation allows each part to be optimized for its specific function, resolving the contradiction between combustion efficiency and component durability.
Solution Approach 2:
Different sections of the nozzle chamber are given different diameters according to their specific requirements. The first part has a smaller diameter to maintain combustion performance, while the second part has a larger diameter to improve durability and reduce hot corrosion, allowing local optimization of properties.
2Productivity
If multiple orifices are used to improve combustion performance, then the combustion reaction progress is enhanced, but the manufacturing difficulty increases due to the narrow channel size
Solution Approach 1:
The nozzle chamber is segmented into a first part with multiple orifices for combustion performance and a second part with a larger diameter for ease of machining. This segmentation allows the orifices to be machined in a more accessible location with greater clearance, reducing manufacturing difficulty while maintaining combustion efficiency.
3Reliability
If the diameter of the nozzle chamber is increased to improve durability, then the distance between orifices increases and machining becomes easier, but the overall size of the pre-chamber unit increases
Solution Approach 1:
The nozzle chamber is divided into a first part with smaller diameter for compactness and a second part with larger diameter for durability. This segmentation allows the overall unit to remain compact while providing a durable section for the orifices, balancing size and durability requirements.
Data Source
Figure 1
AI summary
A pre-chamber unit (1) of the cylinder of a combustion engine, comprising a pre- chamber (2) and an elongated nozzle chamber (3) connected thereto, a number of orifices (4) being provided at its oneend for connecting the pre-chamber to the main combustion space(5) of the cylinder. The nozzle chamber (3) comprises a part (3b) that is enlarged at least at the position of the orifices (4), its diameter in the transversal direction of the nozzle chamber (3) being larger than that of the part (3a) between the orifices and the pre-chamber.