Transverse Jet Control on Rotating Bodies to Reduce Flow Separation

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Solution Overview

Problem

High-speed rotating bodies experience flow separation and shock waves during flight, leading to reduced efficiency due to extreme rotation and velocity, which existing technologies have not effectively addressed.

Innovation Solution

The implementation of transverse jets that inject air into the airstream, altering the flow structure around and behind the body, specifically impacting viscous and pressure drag, shock wave interactions, boundary layer separations, recirculation, and wake, by modifying the flow characteristics through angle of attack, Reynolds number, and jet exit velocity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If high-speed rotation and velocity are maintained, then flight speed and rotational performance are improved, but flow separation and shock waves occur leading to reduced efficiency

Engineering Contradiction:

Improveflight speedVSAvoidflight efficiency

Core Design Contradiction:

SpeedVSProductivity

Solution Approach 1:

The patent applies preliminary anti-action by introducing transverse jets before flow separation occurs. The jets create a protective flow structure that prevents separation and shock wave formation in advance, allowing high-speed flight to maintain efficiency without the adverse effects that would otherwise occur at those speeds

Inventive Principle:

Principle #9Preliminary anti-action

2Productivity

If transverse jets are introduced to reduce flow separation, then flight efficiency is improved, but device complexity increases

Engineering Contradiction:

Improveflight efficiencyVSAvoidjet system complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent utilizes porous material principles by incorporating transverse jets through the body surface. This approach integrates the jet system into the existing body structure rather than adding separate complex components, thereby improving flight efficiency while minimizing the increase in device complexity

Inventive Principle:

Principle #31Porous materials

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 introduction of transverse jets significantly reduces flow separation and shock waves, enhancing flight efficiency by modifying the flow structure and drag interactions, thereby improving the overall performance of high-speed rotating objects.

Implementation Method 1

The use of transverse jets significantly reduces flow separation and shock waves, enhancing flight efficiency by modifying drag interactions and boundary layer behavior

Methodology Applied

Scientific EffectJet injection: Jet

Implementation Method 2

specifically impacting viscous and pressure drag, shock wave interactions, boundary layer separations, recirculation, and wake

Methodology Applied

Scientific EffectShock wave: Shock Wave

Data Source

PatentUS11261890B2High speed rotating bodies with transverse jets as a function of angle of attack, reynolds number, and velocity of the jet exit

Publication Date: 2022.03.01 ALHUSSAN KHALED ABDULLAH

AI summary

A system includes an elongated cylindrical body having a first end extending to a second end; an outer surface and an inner surface; a thickness extending from the inner surface to the outer surface; and a plurality of openings extending from the inner surface to the outer surface. The system further includes a fluid injection apparatus disposed within the elongated cylindrical body, the fluid injection apparatus is configured to pass fluid through the openings.