Pulsatile Jet Generation via Multi-Outlet Nozzle Vectoring
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Solution Overview
Problem
Existing methods for generating jet pulses either interrupt the primary flow or induce large pressure fluctuations, making them inefficient for applications like propulsion where a steady primary jet is desired.
Innovation Solution
A system that produces a constant flow primary jet, which is then directionally vectored through multiple outlets using mechanical, fluidic, or electromagnetic means to create pulsatile flow, allowing for control over pulse duration and frequency while maintaining a steady primary jet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transient piston motion is used to generate jet pulses, then jet pulsation is achieved, but time and energy are expended retracting the piston and refilling the plenum
Solution Approach 1:
The system segments the single continuous jet flow into multiple discrete outlet streams using a nozzle with multiple outlets. The primary jet is divided and redirected to different outlets in sequence, creating pulsed flow at each outlet without requiring plenum refilling. This segmentation allows the jet to be distributed to multiple pathways simultaneously, eliminating the need to retract and refill a single plenum chamber.
Solution Approach 2:
The primary jet serves multiple functions by being redirected to different outlets for different purposes. The same jet flow can be directed to outlets positioned at different angles, enabling both propulsion and maneuvering functions from a single jet source. This multi-functionality eliminates the need for separate systems for different operations.
2Productivity
If flow is interrupted or oscillations are induced to generate jet pulses, then pulsatile flow is achieved, but large pressure fluctuations occur in the flow
Solution Approach 1:
The system extracts the pulsation function from the primary jet flow itself and transfers it to the outlet selection mechanism. The primary jet remains steady and continuous, while the pulsing effect is created by selectively opening and closing different outlets. This extraction separates the steady flow generation from the pulsation control, allowing pressure stability in the primary jet while achieving pulsed flow at the outlets.
Solution Approach 2:
The multiple outlets act as intermediaries between the steady primary jet and the desired pulsed flow. The outlets are positioned and controlled to convert the continuous jet into pulsed streams without disrupting the primary flow's pressure stability. The outlets serve as a mediating layer that transforms the flow characteristics without causing large pressure fluctuations in the source jet.
3Adaptability or versatility
If a nozzle with multiple outlets is used with jet vectoring, then thrust vectoring for maneuvering is achieved, but device complexity increases
Solution Approach 1:
The system merges the jet pulsation function and thrust vectoring function into a single integrated nozzle structure with multiple outlets. The same outlets that create pulsed flow also provide directional control for maneuvering. By combining these functions in one structure rather than using separate systems, the overall device complexity is reduced while maintaining both capabilities.
Solution Approach 2:
The system adds the spatial dimension of multiple outlet orientations to the basic jet flow. By positioning outlets at different angles and locations, the system achieves three-dimensional thrust vectoring capability. This dimensional approach to control allows maneuvering in multiple directions without requiring complex mechanical actuation systems.
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 enables efficient and simple generation of pulsatile jet flow, enhancing thrust and propulsive efficiency by producing compact vortical structures, and provides thrust vectoring for maneuvering and directional control.
Implementation Method 1
fluidically (using the Coanda effect, synthetic jets, counter flow, or other means)
Implementation Method 2
mechanically (using valves, vanes, or other means)
Data Source
AI summary
A method of producing a pulsatile jet flow from a substantially constant flow primary jet in a way that is mechanically efficient, easy to implement, and allows direct control over pulse duration and pulsing frequency is disclosed herein. The invention includes at least two components: (a) a constant flow fluid jet produced by any normal method (e.g., propeller) that can be directionally vectored fluidically, mechanically, or electromagnetically and (b) a nozzle with multiple outlets (orifices) through which the vectored jet may be directed. By alternately vectoring the jet through different outlets, a transient (pulsatile) flow at an outlet is obtained even with a substantially constant primary jet flow. Additionally, the nozzle outlets may be oriented in different directions to provide thrust vectoring, making the invention useful for maneuvering, directional control, etc.