Turbomachine Cooling Device Using Bleed Airflow Ejector
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Turbine engines face challenges in efficiently dissipating heat generated by mechanical losses in reduction gearboxes, leading to potential degradation of mechanical components and reduced performance, especially at low airflow speeds where air bleed devices increase complexity and mass.
Innovation Solution
A turbine engine design where the nozzle of the cooling device is connected to the bleed system, allowing the bleed airflow to feed the cooling device, reducing the number of ducts and valves, and using a control valve to regulate airflow between outlets, thereby simplifying the cooling circuit and reducing mass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If air bleed devices are used to increase airflow through the exchanger at low speeds, then cooling efficiency is improved, but device complexity and mass increase
Solution Approach 1:
The patent merges the air bleed device with the cooling device by connecting the bleed airflow directly to the exchanger inlet. This integration allows the same airflow path to serve both purposes: preventing compressor pumping and providing cooling airflow, thereby eliminating the need for separate ducts and valves while maintaining cooling efficiency at low speeds.
Solution Approach 2:
The bleed airflow is given a dual function: it simultaneously serves to prevent compressor pumping phenomena and to provide cooling airflow through the exchanger. By making the bleed system universal for both purposes, the patent reduces the number of dedicated components needed for cooling while maintaining effective heat dissipation at low operating speeds.
2Productivity
If separate ducts and valves are used for cooling, then cooling performance is improved, but mass and complexity increase
Solution Approach 1:
The patent combines the cooling function with the existing bleed system by directly connecting the bleed airflow to the exchanger inlet. This eliminates the need for separate cooling ducts and valves, reducing the overall mass of the engine while maintaining effective cooling performance through the shared airflow path.
3Ease of operation
If multiple valves are used to regulate airflow, then cooling control is improved, but device complexity increases
Solution Approach 1:
The bleed valve is given a dual function: it simultaneously regulates airflow for preventing compressor pumping and controls cooling airflow through the exchanger. By making the valve universal for both purposes, the patent reduces the number of control components needed while maintaining effective cooling control through the shared airflow path.
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 configuration enhances cooling efficiency at low speeds, reduces the number of ducts and valves, and minimizes the risk of compressor pumping phenomena, leading to improved performance and reduced complexity and mass in the turbine engine.
Implementation Method 1
an ejector of the jet pump type, which comprises a feed-through duct for a secondary airflow coming from the air outlet
Implementation Method 2
a heat exchanger, an air outlet of which is connected to an ejector of the jet pump type
Data Source
AI summary
The invention relates to a turbine engine, comprising:a device for bleeding a compressor, particularly a high-pressure compressor, comprising at least one valve for bleeding said compressor, an outlet of said valve being connected to a bleed system designed to discharge a bleed airflow; andat least one device for cooling at least one unit, comprising a heat exchanger, an air outlet of which is connected to an ejector of the jet pump type, which comprises a feed-through duct for a secondary airflow coming from said air outlet, as well as a nozzle for spraying a primary airflow inside said feed-through duct,wherein the nozzle is connected to said bleed system.