Liquid Jet Processing Head for Stable Additive Mixing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Incorporating a second distinct liquid into an ultra-high-pressure (UHP) waterjet system for agricultural applications leads to unsteady flow perturbations and degradation of cutting ability due to droplet formation and compressible effects, which traditional systems struggle to address.
Innovation Solution
A processing head design that controls the injection and mixing of three fluid streams - a high-pressure liquid jet, gas, and additive fluid - to maintain velocity and focus, using a fluid mixing insert and mixing tube to ensure effective cutting performance by separating and mixing these streams efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a second distinct liquid (additive) is injected into an UHP waterjet, then agricultural application functionality is improved, but flow stability and cutting ability are degraded due to droplet formation and compressible effects
Solution Approach 1:
The injection system is divided into multiple separate injection nozzles, each dedicated to a specific additive fluid. This segmentation allows each nozzle to be optimized for its specific fluid while maintaining overall system stability. The multiple nozzles are arranged to inject additives at different locations and angles into the waterjet stream, enabling versatile agricultural applications without compromising the core waterjet's flow stability.
Solution Approach 2:
A carrier gas (such as air or nitrogen) is introduced as an intermediary medium to transport the additive fluids from the injection nozzles into the UHP waterjet stream. The carrier gas acts as a buffer that prevents direct contact between incompatible additive fluids and the pressurization system, while still enabling effective delivery of the additives into the waterjet for agricultural applications.
2Adaptability or versatility
If additive fluids are injected into the UHP waterjet, then agricultural input application capability is improved, but cutting precision is degraded due to unsteady flow perturbations
Solution Approach 1:
The injection nozzles are positioned and angled to deliver additives locally into specific regions of the waterjet stream, rather than uniformly throughout. This localized injection approach ensures that additives are applied where needed for agricultural purposes while minimizing disruption to the overall waterjet flow structure and maintaining cutting precision in non-additive zones.
Solution Approach 2:
The system incorporates adjustable injection parameters including variable flow rates, adjustable nozzle angles, and controllable injection timing. These dynamic adjustments allow the system to optimize the balance between additive application effectiveness and waterjet flow stability, enabling precise control over when and how additives are introduced to maintain cutting precision.
3Adaptability or versatility
If multiple fluid streams are combined in the processing head, then functional versatility is improved, but device complexity increases due to multiple apertures and mixing components
Solution Approach 1:
The processing head is designed with a universal structure that can accommodate multiple types of additive fluids through standardized injection nozzles and apertures. The same basic processing head configuration can deliver different agricultural inputs (fertilizers, pesticides, herbicides) by simply changing the additive supply lines, without requiring fundamental redesign of the waterjet delivery system.
Solution Approach 2:
The injection nozzles and additive delivery channels are nested within the existing waterjet processing head structure. The additive injection system is integrated into the hollow interior of the processing head, with nozzles positioned inside or on the surface of the head body, thereby adding functionality without significantly increasing external dimensions or structural complexity.
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 solution minimizes flow perturbations, allowing for the successful incorporation of additives like fertilizer into the UHP waterjet without degrading cutting ability, enabling precise application in agricultural settings.
Implementation Method 1
A processing head design that controls the injection and mixing of three fluid streams - a high-pressure liquid jet, gas, and additive fluid - to maintain velocity and focus, using a fluid mixing insert and mixing tube to ensure effective cutting performance by separating and mixing these streams efficiently.
Implementation Method 2
Ultra-high-pressure (hereinafter referred to as 'UHP') liquid jets, such as waterjets, and solid abrasive injection liquid jets, such as waterjet, are established industrial cutting solutions
Implementation Method 3
The flow of gas introduced via the second aperture is controlled relative to a flow rate of the liquid jet to induce the flow of gas in a pattern that approximates Couette flow. The high velocity flow of gas is adapted to prevent backflow of the additive fluid toward upstream.
Implementation Method 4
The conical section can be shaped to induce the additive fluid to flow as a wall film as the additive fluid approaches the liquid jet and the gas.
Data Source
AI summary
An additive supply apparatus for a high-pressure liquid jet system is provided. The additive supply apparatus includes a processing head having a central bore extending along a central longitudinal axis of the processing head from a proximal end to a distal end. The additive supply apparatus also includes a first aperture fluidly connected to the central bore to supply a fluid jet to flow longitudinally within the processing head, a second aperture fluidly connected to the central bore to supply a flow of gas to the processing head, and a third aperture fluidly connected to the central bore to supply a flow of an additive fluid to the processing head. The additive supply apparatus further includes a fluid mixing insert disposed within the central bore and fluidly connected to the first, second and third apertures, and a mixing tube in fluid communication with and downstream from the fluid mixing insert.