Cylinder Head Intake Duct Tumble Flow Generation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Gas engines require tumble flow for optimized combustion, which is not efficiently facilitated by the vortex-generating intake ducts of conventional diesel engines, necessitating a structural modification to promote tumble flow.
Innovation Solution
A cylinder head design with an oblique tumble generating duct and a sharp angle projection on the valve seat ring to direct airflow, creating a tumble effect by deflecting airflow towards the exhaust valve, enhancing tumble flow generation within the cylinder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a tangential and spiral air intake duct is used to generate vortex for diesel engine combustion, then vortex generation is improved, but tumble flow generation deteriorates
Solution Approach 1:
The intake duct is divided into multiple sections with different functions: a first intake duct section for vortex generation and a second intake duct section for tumble flow generation. This segmentation allows each section to be optimized for its specific function, resolving the contradiction between vortex and tumble flow requirements
Solution Approach 2:
Different sections of the intake duct are given different structural characteristics: the first section has a tangential and spiral configuration for vortex generation, while the second section has a straight and axial configuration for tumble flow generation. This local differentiation enables both flow patterns to be generated effectively
2Adaptability or versatility
If the intake duct structure is completely redesigned for tumble flow, then tumble flow generation is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The intake duct is designed to perform multiple functions: it can generate both vortex and tumble flow patterns depending on the section. This multi-functionality allows the same component to serve different combustion requirements without needing complete redesign
Solution Approach 2:
The intake duct design allows for flexible configuration where the first and second sections can be arranged in different orientations (tangential/spiral vs. straight/axial) to dynamically adapt to different engine requirements while maintaining a unified overall structure
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 design effectively generates the required tumble flow, improving combustion efficiency and thermal performance of gas engines while minimizing product modification costs by adapting existing diesel engine intake duct structures.
Implementation Method 1
the lower side surface of the tumble generating duct is a tumble guide surface, and the lower end of the tumble guide surface forms a tumble generating sharp angle located above the valve seat ring
Implementation Method 2
the extending direction of the tumble generating duct is oblique relative to the cylinder head bottom surface... creating a tumble effect by deflecting airflow
Data Source
AI summary
A cylinder head includes an intake throat and an intake duct, a valve seat ring is provided in an inner ring of the intake throat; a section of the intake duct is a tumble generating duct; and an extending direction of the tumble generating duct is oblique relative to the cylinder head bottom surface, the lower side surface of the tumble generating duct is a tumble guide surface, the lower end of which forms a tumble generating sharp angle, and the projection of the tumble generating sharp angle on the upper end circular surface of the valve seat ring is a sharp angle projection, the sharp angle projection is a protruding area protruding from the edge of the upper end circular surface of the valve seat ring, and the width of the middle part of the sharp angle projection is larger than the width of both ends thereof.