Flow Guiding System for Rotary Combustion Engine
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Solution Overview
Problem
Rotary combustion engines face challenges in managing thermal conditions and maintaining fire extinguishing medium concentrations, which are compromised by cooling or heating requirements, affecting tip clearance control and fire safety in aircraft turbines and other applications.
Innovation Solution
A flow guiding system for rotary combustion engines that decouples airflow regimes using a flow scoop device and flow guiding devices, allowing independent adjustment of airflow to control tip clearance and maintain fire extinguishing medium concentrations, incorporating features like air curtains and adjustable valves to manage airflow ratios and temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If cooling air is channeled from the bypass region into the core region to control tip clearance, then tip clearance control is improved, but fire extinguishing medium concentration is compromised
Solution Approach 1:
The cooling air flow is segmented into multiple independent flow paths using flow guiding devices. One path directs cooling air to the turbine blade tips for clearance control, while another path directs air to regions requiring fire extinguishing medium concentration. This segmentation allows each flow regime to be optimized independently without compromising the other.
Solution Approach 2:
Flow guiding devices act as intermediaries between the bypass region and different core regions. These devices selectively channel airflow to specific areas, mediating between the competing requirements of tip clearance control and fire extinguishing medium concentration maintenance.
2Stability of the object's composition
If thermal management is prioritized to maintain design limits, then engine structure stability is improved, but fire safety is compromised
Solution Approach 1:
The engine's thermal management system is segmented into independent control zones. Flow guiding devices create separate airflow regimes that can be independently optimized for structural stability in some regions while maintaining fire safety in others, particularly in regions containing flammable fluids.
Solution Approach 2:
Different regions of the engine are provided with different airflow qualities and temperatures according to their specific requirements. Regions requiring fire safety maintain higher fire extinguishing medium concentrations, while regions requiring thermal management receive targeted cooling air, allowing each region to have optimized local conditions.
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 system effectively manages thermal conditions and fire extinguishing medium concentrations, enhancing tip clearance control and fire safety by allowing flexible airflow design and independent control of cooling and heating within the engine, improving operational safety and efficiency.
Implementation Method 1
The at least one flow guiding device comprises an air curtain (or fence) to keep the flow regimes in two regions of the engine essentially separate
Implementation Method 2
the second airflow is heating or cooling at least a part of the core region, in particular at least a part of the wall of the core region in the vicinity of the blades of a turbine, in particular to control the size of the tip clearance
Implementation Method 3
the third airflow is used in a heat exchanger to cool the second airflow
Data Source
AI summary
A flow guiding system for a rotary combustion engine, in particular an aircraft jet engine. The flow guiding system comprises a bypass region positioned radially around a core region, a flow scoop device for guiding a first airflow from the bypass region, at least one flow guiding device for decoupling the flow regime in a region containing a flammable fluid from a flow regime in a region with tip clearance control by at least partially guiding at least one airflow divided from the first airflow, a second airflow directed into the region containing flammable fluid, and/or a third airflow directed into a region away from the region containing flammable fluid.