Induction Nozzle Crosswind Shielding via Port Segregation
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Solution Overview
Problem
Existing exhaust discharge nozzles are susceptible to performance degradation in crosswinds due to 'see-through' central passive zones that allow crosswinds to disrupt ambient air induction, reducing plume height and effluent dispersion efficiency.
Innovation Solution
The modification of the frusto-conical central nozzle design includes a full-length wind band and mounting brackets to shield induction ports from crosswinds, a transverse induction port separation plate to segregate induction ports, and a single induction port design to prevent crosswind interference, enhancing vertical airflow and plume height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a see-through central passive zone is used in the nozzle design, then ambient air induction is enhanced in static conditions, but crosswind performance is degraded due to crosswind blow-through
Solution Approach 1:
The invention extracts or removes the problematic see-through central passive zone from the nozzle design. By eliminating this open central area that allows crosswind blow-through, the design prevents crosswinds from disrupting the induction ports while maintaining ambient air induction capability through the reconfigured port structure.
Solution Approach 2:
The invention applies local quality changes by modifying specific regions of the nozzle - particularly the induction ports are redesigned with extended lateral boundaries and repositioned outlets. This localized modification to the port geometry allows the system to maintain high ambient air induction in calm conditions while becoming resistant to crosswind disruption.
2Productivity
If induction ports are interconnected with a central passive zone, then air mixing efficiency is improved in static conditions, but crosswind interference increases
Solution Approach 1:
The invention removes the vulnerable interconnected central passive zone structure that enabled crosswind blow-through. By extracting this problematic configuration, the design eliminates the pathway for crosswinds to disrupt the air mixing process while maintaining mixing efficiency through the reconfigured induction port geometry.
Solution Approach 2:
The invention applies local quality changes to the induction port structure, extending lateral boundaries and repositioning outlets to create regions that are resistant to crosswind interference. This localized structural modification maintains the air mixing function while adding crosswind protection.
3Length of stationary object
If the nozzle is designed for maximum ambient air entrainment, then plume height is increased in static conditions, but crosswind blow-through reduces performance
Solution Approach 1:
The invention extracts the vulnerable see-through central passive zone that allowed crosswind blow-through to occur. By removing this structural weakness, the design maintains high plume height performance in calm conditions while becoming reliable in varying wind conditions, as the reconfigured induction ports are no longer susceptible to crosswind disruption.
Solution Approach 2:
The invention applies local quality modifications to the induction port structure, creating extended lateral boundaries and repositioned outlets that maintain high ambient air entrainment capability while adding resistance to crosswind interference. This localized structural enhancement ensures performance consistency across varying wind conditions.
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 modified nozzle design significantly improves performance in crosswinds by shielding induction ports and preventing crosswind disruption, maintaining plume height and effluent dispersion efficiency comparable to static conditions.
Implementation Method 1
Crosswinds not only affect the external plume height, in accordance with the Briggs equations, but they can also interfere with and limit ambient air entrainment into the nozzle
Implementation Method 2
The device is designed with a constriction at the outlet to accelerate the exhaust effluent at a high velocity into the atmosphere
Implementation Method 3
A further development of the constrictive exhaust nozzle design is the type of nozzle that employs the Venturi effect to draw additional ambient air into the primary effluent stream
Implementation Method 4
The additional induced air volume dilutes the primary exhaust gases at/near the nozzle as the combined mixed air volumes are released into the atmosphere
Implementation Method 5
Properly designed nozzles are capable of propelling high velocity plumes of exhaust gases to heights sufficient to prevent stack downwash and disperse the effluent over a large upper atmospheric area
Data Source
AI summary
A modified version of an induction nozzle having a central “see-through” passive zone protects the induction ports from crosswind disruption. Modified features include: (i) a full-length wind band extending below the induction port inlets; (ii) multiple full-length mounting brackets, which impede circumferential crosswind flow around the nozzle; (iii) a transverse induction port separation plate, orthogonal to the centerlines of the induction ports; and (iv) elimination of one induction port opening.