Jet Pump Annular Nozzle Shock Wave Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional fluid movers with moving parts are sensitive to shock wave position, prone to instability, and limited by throat dimension restrictions, which affects particulate throughput and can cause blockages, and they achieve only restricted shock waves.
Innovation Solution
A fluid mover with a hollow body and annular nozzle that introduces a condensable transport fluid, such as steam, to create a pseudo-vena contracta and supersonic condensation shock wave within a mixing chamber, enhancing energy transfer and momentum transfer without physical constraints, allowing for flexible fluidic boundaries and improved droplet dispersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a central steam nozzle is used in conventional ejectors, then the shock wave position becomes restricted and unstable, but the device complexity is reduced
Solution Approach 1:
The single central nozzle is segmented into multiple nozzles arranged circumferentially around the working fluid passage. This segmentation allows independent control of each nozzle's steam injection, enabling stable shock wave positioning through coordinated operation of multiple nozzle sections while maintaining operational simplicity.
Solution Approach 2:
The invention transitions from a one-dimensional central nozzle arrangement to a three-dimensional circumferential array of nozzles. This dimensional change enables shock wave stabilization by distributing steam injection around the entire circumference, creating a more uniform and controllable shock wave field without increasing operational complexity.
2Productivity
If the throat dimension is restricted in conventional ejectors, then the device complexity is reduced, but the particulate throughput is limited and blockages occur
Solution Approach 1:
The invention transitions from a two-dimensional cross-sectional throat to a three-dimensional annular passage with constant cross-section along its length. This dimensional extension allows particles to pass through without encountering restrictive throat constrictions, significantly increasing particulate throughput while maintaining simple cylindrical geometry that avoids complex manufacturing.
Solution Approach 2:
Instead of constricting the passage to create a throat (conventional approach), the invention inverts the approach by maintaining a constant, unrestricted cross-section throughout the mixing chamber. This inversion eliminates blockage risks while preserving the necessary mixing function through the annular nozzle configuration.
3Power
If a convergent/divergent section is used to achieve shock wave, then the energy transfer is improved, but the shock wave position becomes unstable and easily moves away from optimum
Solution Approach 1:
The convergent/divergent section is segmented into multiple circumferential nozzle zones that can operate independently or in coordination. This segmentation allows the shock wave position to be stabilized by adjusting individual nozzle contributions, maintaining optimal energy transfer while preventing shock wave migration that occurs in single-section designs.
Solution Approach 2:
The annular nozzle arrangement provides multi-functionality by simultaneously achieving shock wave generation, position stabilization, and energy transfer optimization. The circumferential configuration allows the system to perform multiple functions (pumping, mixing, heating, emulsifying) while maintaining stable shock wave positioning, eliminating the trade-off between energy transfer and stability.
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 improves energy transfer efficiency, increases momentum transfer zone length, and enhances droplet dispersion, leading to more intense condensation shock waves and improved performance compared to conventional systems, with enhanced versatility and ability to handle a wide range of fluid and solid mixtures.
Implementation Method 1
through the introduction of steam the working fluid or fluids are atomised to form a dispersed vapour/droplet flow regime with locally supersonic flow conditions within a pseudo-vena contracta, resulting in the creation of a supersonic condensation shock wave within the downstream mixing chamber by the condensation of the steam
Implementation Method 2
creation of a supersonic condensation shock wave within the downstream mixing chamber by the condensation of the steam
Implementation Method 3
Through a combination of momentum transfer, high shear, and the generation of a condensation shock wave, the high velocity steam induces and acts upon the working fluid passing through the centre of the hollow body
Implementation Method 4
Through a combination of momentum transfer, high shear, and the generation of a condensation shock wave
Implementation Method 5
The ejector principally operates on the basis of inducing flow by creating negative pressure, generally by the use of the venturi principle
Implementation Method 6
The pressure gradient generated in the venturi induces new working fluid to enter the mixing chamber
Data Source
AI summary
A fluid mover (1) includes a hollow body (2) provided with a straight-through passage (3) of substantially constant cross section with an inlet end (4) an outlet end (5) for the entry and discharge respectively of a working fluid. A nozzle (16) substantially circumscribes and opens into the passage (3) intermediate the inlet (4) and outlet (5) ends. An inlet (10) communicates with the nozzle (16) for the introduction of a transport fluid and a mixing chamber (3A) is formed within the passage (3) downstream of the nozzle (16). The nozzle internal geometry and the bore profile immediately upstream of the nozzle exit are disposed and configured to optimise the energy transfer between the transport fluid and working fluid. In use, through the introduction of transport fluid, the working fluid or fluids are atomized to form a dispersed vapor/droplet flow regime with locally supersonic flow conditions within a pseudo-vena contracta, resulting in the creation of a supersonic condensation shock wave (17) within the downstream mixing chamber (3A) by the condensation of the transport fluid. Methods of moving and processing fluids using the fluid mover are also disclosed.