Rail Vehicle Roof Cooling Conduit Venturi Profile
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing cooling aeraulics devices for rail vehicles are prone to mechanical failures, inefficient at low speeds, and suffer from air flow separation at high speeds, leading to inadequate cooling of electronic power components.
Innovation Solution
A cooling aeraulics device utilizing a main conduit with a flared front and rear portion and a secondary conduit to generate air acceleration through the Venturi effect and turbulence, ensuring efficient air circulation around the condenser tubes without mechanical moving parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mobile scoops are used to divert air flow, then air circulation around the element is improved, but mechanical reliability deteriorates due to actuating cylinder failures
Solution Approach 1:
The patent replaces the mechanical actuating cylinder system with a purely aerodynamic solution. The conduit profile itself generates the air flow acceleration through the Venturi effect, eliminating mechanical moving parts and actuators that were prone to failure. This substitution of mechanical systems with aerodynamic principles resolves the reliability issue while maintaining cooling effectiveness.
Solution Approach 2:
The conduit structure serves itself by using the vehicle's motion and ambient air flow to generate the necessary cooling air circulation. The Venturi profile automatically accelerates air through the conduit without requiring external actuators or energy input, making the system self-regulating and highly reliable across different operating conditions.
2Temperature
If mobile scoops are deployed to capture air flow, then cooling performance is improved, but the device becomes sensitive to vehicle speed with insufficient cooling at low speeds and air flow separation at high speeds
Solution Approach 1:
The patent changes the geometric parameters of the conduit, specifically implementing a Venturi profile with varying cross-sectional area. This geometric parameter change creates a pressure gradient that accelerates air flow through the conduit. The effect is speed-independent because it relies on the pressure differential created by the profile shape rather than the absolute velocity of the vehicle, enabling effective cooling across the full range of operating speeds.
3Reliability
If a fixed conduit structure is used, then mechanical reliability is improved, but air flow acceleration and cooling efficiency deteriorate
Solution Approach 1:
The patent applies local quality by creating a specific Venturi profile in the conduit with a narrowed central section and flared end portions. This localized geometric feature generates the pressure gradient and air flow acceleration needed for efficient cooling. The fixed structure provides reliability while the localized profile change delivers the required cooling performance without mechanical complexity.
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 device achieves effective cooling across various speeds by accelerating air flow through the Venturi effect and turbulence, ensuring efficient heat dissipation for the condenser tubes, even at low speeds, without the need for fans or mechanical parts.
Implementation Method 1
The document WO 2008/031752 discloses an aeraulic device comprising a conduit of which the profile, between a front opening for the intake of air and a rear opening for the discharge of exhaust air, evolves in a manner so as to generate an acceleration of the flow of air in the conduit by means of the Venturi effect.
Implementation Method 2
A cooling aeraulics device utilizing a main conduit with a flared front and rear portion and a secondary conduit to generate air acceleration through the Venturi effect and turbulence
Data Source
AI summary
A cooling aeraulics device is for cooling an element of a rail vehicle. The aeraulics device is designed to be placed on a roof of the rail vehicle and includes a conduit, which extends substantially longitudinally in relation to the rail vehicle. The conduit includes, successively, a front portion equipped with a front opening for the intake of air, a central portion, in which is housed the element to be cooled, and a rear portion, equipped with a rear opening for the discharge of exhaust air. A surface of a transverse cross-section of the conduit evolves, from the front opening to the rear opening, so as to generate an acceleration of the flow of air in the conduit through the Venturi effect.