Variable Compression Air Intake With Movable Ramp for Supersonic Flow
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Solution Overview
Problem
Conventional supersonic aircraft propulsion systems face challenges with complex and heavy designs due to the need for multiple moving parts to adjust airflow deceleration, leading to inefficiencies and increased weight, particularly in handling varying Mach numbers during different flight regimes.
Innovation Solution
A variable compression air intake system with a non-planar compression ramp and a movable second bump, along with a fixed cowl and a translating diffuser ramp, allows for efficient airflow management across a wide range of Mach numbers using only two moving parts, reducing complexity and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional inlet design with movable cowl is used to decelerate airflow, then airflow deceleration is achieved, but weight and device complexity increase due to multiple moving parts
Solution Approach 1:
The compression ramp is made movable relative to the fixed cowl lip, allowing dynamic adjustment of the inlet geometry to control airflow deceleration. This single moving part replaces the conventional multiple moving parts while achieving the same airflow control function across different flight regimes.
Solution Approach 2:
The inlet system is segmented into a fixed cowl lip and a movable compression ramp, allowing independent optimization of each component. The fixed cowl provides structural stability while the movable ramp handles airflow control, reducing the need for additional moving parts.
2Adaptability or versatility
If conventional inlet design with multiple moving parts is used, then airflow control across Mach numbers is achieved, but weight increases
Solution Approach 1:
The movable compression ramp provides dynamic adaptability to control airflow across different Mach numbers, replacing multiple heavy moving parts with a single lightweight movable component that achieves the same versatility.
Solution Approach 2:
The single movable compression ramp performs multiple functions: controlling airflow at subsonic speeds, managing supersonic flow, and adjusting compression ratios across the entire flight regime, replacing what would traditionally require multiple specialized moving parts.
3Productivity
If non-planar compression ramp is used, then compression performance improves, but manufacturing complexity increases
Solution Approach 1:
The compression ramp uses a non-planar, curved surface geometry to optimize compression performance and airflow management. The curved profile naturally guides flow and creates effective compression while remaining manufacturable using standard aerospace fabrication techniques.
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 system provides superior compression performance, natural boundary layer diversion, and uniform airflow to the engine, minimizing bleed requirements and drag penalties, while maintaining structural integrity and reducing weight and complexity.
Implementation Method 1
The compression ramp is movable relative to the cowl lip to vary compression of an inlet airflow through the inlet
Implementation Method 2
The compression ramp is non-planar. The compression ramp is movable relative to the cowl lip to vary compression of an inlet airflow through the inlet
Data Source
AI summary
A propulsion system for an aircraft includes an engine having a central axis. A cowl surrounds the engine and includes a cowl lip. A compression ramp is spaced away from the cowl lip. An inlet is formed by the cowl lip and the compression ramp. The compression ramp is non-planar. The compression ramp is movable relative to the cowl lip to vary compression of an inlet airflow through the inlet.