Convergent Nozzle for Vehicle Cab Aerodynamic Drag Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Industrial vehicles face significant aerodynamic drag due to the upright windshield design, leading to increased fuel consumption and turbulence, with existing solutions either ineffective or noisy.
Innovation Solution
A convergent nozzle is integrated at the front upper corner of the vehicle cab, channeling air flow to reduce turbulence and aerodynamic drag by accelerating air to follow the cab side wall, without adding additional drag or noise, using a design where the nozzle's inner wall protrudes inwardly and the outer wall is level with the side envelope wall, forming a peripherally closed passageway with decreasing cross-section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If an upright windshield is used in the cab, then the cargo capacity is maintained, but the aerodynamic drag increases and turbulence is generated at the upper corners
Solution Approach 1:
The cab is divided into functional zones with the nozzle creating a controlled airflow channel at the front upper corner, separating the main airflow path from the turbulent corner regions
Solution Approach 2:
The nozzle acts as an intermediary device that mediates between the upward airflow along the windshield and the rearward airflow over the roof, channeling and accelerating the air to follow the cab contours smoothly
2Object-affected harmful factors
If additional air guiding devices are added to reduce turbulence, then the aerodynamic drag is reduced, but the device complexity increases and additional drag is generated
Solution Approach 1:
The nozzle is placed locally at the front upper corner where turbulence is most acute, providing targeted airflow control only where needed rather than requiring comprehensive air guiding systems throughout the cab
Solution Approach 2:
The nozzle utilizes the existing upward airflow along the windshield and converts it into a controlled rearward flow, making the airflow itself serve the aerodynamic control function without requiring additional power or complex mechanisms
3Object-affected harmful factors
If additional air guiding devices are added to reduce turbulence, then the aerodynamic drag is reduced, but additional noise is generated
Solution Approach 1:
The nozzle converts the potentially harmful upward airflow that would create turbulence into a beneficial accelerated stream that follows the cab contours smoothly, transforming a problem into a solution
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 nozzle significantly reduces aerodynamic drag and turbulence, leading to decreased fuel consumption and improved aerodynamics without generating additional drag or noise, by accelerating air to follow the cab side wall, thus enhancing the vehicle's efficiency.
Implementation Method 1
the nozzle comprising an inner wall protruding inwardly with respect to the cab side envelope wall and an outer wall substantially level with said side envelope wall so as to channel an air flow from the upright cab front section to a cab side wall at a higher velocity
Implementation Method 2
Thanks to the nozzle, the outgoing air is made to substantially follow the cab side wall instead of deviating from it, which limits turbulence and aerodynamic drag
Data Source
AI summary
The vehicle cab (4) has a roof structure (6), an upright cab front section (7) and two side walls (8) each defining a side envelope wall extending substantially vertically. The cab incorporates at least one convergent nozzle (33) located at a front upper corner of the cab, said nozzle comprising an inner wall (20) protruding inwardly with respect to the cab side envelope wall and an outer wall substantially level with said side envelope wall so as to channel the air flow from the upright cab front section to a cab side wall at a higher velocity.