Turbine Casing Thermal Insulation for Exhaust-Gas Turbochargers
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Solution Overview
Problem
Turbine casings in exhaust-gas turbochargers face challenges with excessive heat input, leading to increased weight and installation space requirements, particularly in automotive applications, where cooled casings are cumbersome and inefficient.
Innovation Solution
The implementation of a thermal insulating device within the turbine casing, utilizing high-temperature-resistant sleeves, ceramic inlays, flow baffle plates, and external wastegate arrangements to reduce direct heat contact and minimize cooling needs, combined with materials like steel and iron for enhanced thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooled turbine casings are used, then heat input to the casing is reduced, but weight and installation space increase
Solution Approach 1:
A thermal insulating device is introduced as an intermediary between the hot exhaust gases and the turbine casing. This insulating layer acts as a mediator that reduces heat transfer to the casing without requiring active cooling systems, thereby avoiding the weight penalty associated with cooled casings while still protecting the casing from excessive heat input.
2Temperature
If cooled turbine casings are used, then heat input to the casing is reduced, but installation space increases
Solution Approach 1:
The thermal insulating device serves as a space-efficient intermediary that reduces heat input without requiring the additional installation space needed for active cooling systems. The insulating layer is integrated into the existing casing structure, maintaining compact dimensions while achieving thermal protection.
3Temperature
If thermal insulating device is added, then heat transfer to casing is reduced, but device complexity increases
Solution Approach 1:
The thermal insulating device utilizes porous or fibrous insulating materials that can be easily integrated into the turbine casing structure. These materials provide effective thermal insulation through their inherent porous structure, which traps air and reduces heat conduction, while adding minimal structural complexity to the overall device.
Solution Approach 2:
The solution employs composite material construction where thermal insulating materials are combined with the metal casing structure. This composite approach allows the insulating layer to be integrated during manufacturing, creating a unified component that reduces heat transfer without significantly increasing assembly complexity or device 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
This approach significantly reduces heat transfer from exhaust gases to the casing, minimizing the need for cooling measures and addressing weight and space concerns, thereby enhancing the usability of turbine casings in the automotive sector.
Implementation Method 1
a thermal insulating device (5) which is intended to reduce the input of heat into the turbine casing (1)
Data Source
AI summary
The invention relates to a turbine casing of an exhaust-gas turbocharger, having an inlet connection piece adjoined by a spiral, and having an outlet connection piece, characterized by an insulating device for reducing the input of heat into the inlet connection piece, the spiral and/or the outlet connection piece.