Cylinder Head Intake Channel Angles for Tumble Flow
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Solution Overview
Problem
Turbocharged combustion engines with non-optimal intake channel designs experience performance and efficiency issues, particularly at low loads and low engine speeds, due to high pressure drops and suboptimal tumbling flow patterns.
Innovation Solution
A cylinder head design featuring an intake channel with a straight lower wall positioned at specific angles relative to the cylinder bore and intake valve axis, combined with a conically expanding end zone, enhances tumble motion and air-fuel mixing without increasing pressure losses, incorporating a sharp or rounded edge to minimize flow separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional intake channel design is used in a turbocharged engine, then the structure is simple, but high pressure drop and non-optimal tumbling flow pattern result in decreased performance and efficiency
Solution Approach 1:
The patent applies parameter changes by modifying the geometric parameters of the intake channel, specifically the lower wall angle (α) relative to the cylinder bore centre line and the intake valve axis angle (β). These angular parameters are optimized to achieve optimal tumble flow patterns while minimizing pressure drop, thereby improving engine performance without excessive energy loss.
Solution Approach 2:
The patent introduces a new dimensional aspect by considering the three-dimensional orientation of the intake channel walls relative to multiple reference axes (cylinder bore centre line and intake valve axis). By defining angles in multiple dimensions (α and β), the design achieves optimal flow patterns that conventional single-dimension designs cannot achieve.
2Productivity
If the lower wall of the intake channel is curved with small radius, then the flow direction changes gradually, but the tumbling motion is insufficient
Solution Approach 1:
The patent changes the geometric parameter of the lower wall from a small radius curve to a straight configuration with specific angular orientation (α). This parameter change creates sufficient tumbling motion while maintaining acceptable flow direction changes through the optimized angle relative to the cylinder bore and intake valve axis.
3Productivity
If the intake channel is designed to increase tumbling, then air-fuel mixing improves, but pressure losses increase which decreases engine performance
Solution Approach 1:
The patent optimizes the angular parameters (α and β) of the intake channel to achieve a balance where sufficient tumbling motion for improved air-fuel mixing is generated without creating excessive pressure losses. The specific angle ranges defined in the patent represent the optimized parameters that simultaneously achieve both goals.
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 design improves air-fuel mixing and combustion efficiency, allowing for higher compression ratios without engine knocking, enabling increased exhaust gas recirculation while maintaining combustion stability, and optimizing engine performance at low speeds.
Implementation Method 1
The lower wall of the at least one intake channel is positioned at a first angle (α) relative the centre line of the cylinder bore. The intake valve axis is positioned at a second angle (β) relative the lower wall of the intake channel. This design enhances tumble motion and air-fuel mixing
Implementation Method 2
The end zone of the intake channel expands conically towards the intake port relative to the remainder of the intake channel. This design helps minimize flow separation and improves the mixing of fuel and air
Data Source
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AI summary
The invention relates to a cylinder head (1) for an internal combustion engine. Said cylinder head (1) comprises at least one intake channel (2) comprising an intake port (3). The intake channel (2) comprises an upper wall (4), a lower wall (5) and an end zone (6). The intake port (3) comprises a bottom edge (7). An intake valve is arranged to cover the intake port (3) where the intake valve is arranged along an intake valve axis (8). The lower wall (5) of the at least one intake channel (2) is essentially straight in a lengthwise direction. The lower wall (5) of the intake channel (2) is positioned at a first angle (α) relative a centre line (10) of a combustion chamber (9). The intake valve axis (8) is positioned at a second angle (β) relative the lower wall (5) of the intake channel (2).