V-Shaped Spray Ring for Marine Exhaust Cooling
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Solution Overview
Problem
Existing marine exhaust components face challenges in effectively cooling exhaust gases over a wide range of operating conditions, leading to excessive backpressure, corrosion, and inadequate heat exchange due to poor water and gas mixture distribution and upstream migration of cooling water.
Innovation Solution
A water jacketed marine exhaust component with a V-shaped spray ring that creates diverging streams of cooling water, directed both radially inward and outward, to enhance heat transfer and prevent upstream migration, using a radially inwardly tapered exhaust pipe and a corrosion-resistant material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-direction spray ring is used to cool exhaust gases, then the structure is simple, but the heat exchange efficiency is poor and downstream components experience excessive temperatures
Solution Approach 1:
The spray ring is segmented into multiple zones with different aperture orientations. The first aperture creates a first stream directed radially inward, while the second aperture creates a second stream directed radially outward. This segmentation allows different portions of the exhaust gas flow to be cooled effectively, improving overall heat exchange efficiency without requiring a completely complex multi-component structure.
Solution Approach 2:
Different regions of the spray ring are given different functional qualities. The first aperture region targets the inner portion of the exhaust gas flow with radially inward streams, while the second aperture region targets the outer portion with radially outward streams. This local differentiation ensures comprehensive cooling coverage across the entire exhaust gas cross-section, preventing excessive temperatures downstream.
2Device complexity
If cooling water is ejected in a single direction, then the device complexity is low, but the mixture of cooling water and exhaust gas is poor resulting in inadequate heat exchange
Solution Approach 1:
The water injection system is segmented into two distinct stream configurations. The first aperture generates a first stream with a specific trajectory, while the second aperture generates a second stream with a different trajectory. This segmentation creates multiple water streams that interact with different portions of the exhaust gas, improving the overall mixing and heat exchange effectiveness.
Solution Approach 2:
The spray ring utilizes radial dimension differentiation by directing one stream radially inward and another stream radially outward. This dimensional approach ensures that water streams are distributed across the entire radial profile of the exhaust gas flow, creating superior mixing and heat exchange throughout the volume rather than concentrating cooling in a single region.
3Ease of manufacture
If a conventional spray ring is used, then the manufacturing is simple, but cooling water migrates upstream causing corrosion of exhaust pipe
Solution Approach 1:
The spray ring is segmented with apertures oriented in different radial directions. The first aperture directs water radially inward while the second aperture directs water radially outward. This segmentation creates opposing water flow patterns that counteract the upstream migration tendency, preventing corrosive water from traveling back toward the exhaust pipe while maintaining manufacturing simplicity through a single integrated ring structure.
Solution Approach 2:
The spray ring configuration proactively counteracts the harmful upstream migration of cooling water by creating radially outward directed streams that oppose the migration force. This preliminary anti-action is built into the aperture geometry itself, preventing corrosion before it can occur by stopping water migration at its source rather than attempting to mitigate it downstream.
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 provides improved exhaust gas cooling over a wide range of engine operating conditions, reducing backpressure and corrosion while maintaining efficient heat transfer and water distribution.
Implementation Method 1
enhance heat transfer and prevent upstream migration
Implementation Method 2
the remaining portion flowed along the inner surface of the outer shell. The redirected water particles are easily vaporized and in the process, extract a significant amount of heat from the exhaust gases
Implementation Method 3
cooling water, referenced "W", flows through the volume 5 between the outer surface of the exhaust pipe 4 and the inner surface of the water jacket 6 and is ejected via apertures 9 in spray ring 8
Implementation Method 4
The redirected water particles are easily vaporized and in the process, extract a significant amount of heat from the exhaust gases
Implementation Method 5
the tail end of the water jacket (outer shell) was inwardly tapered so as to direct and deflect cooling water into the exhaust gas stream thereby improving heat transfer
Data Source
AI summary
A water jacketed exhaust component includes an exhaust pipe having a radially inwardly tapered tail end, a water jacket disposed in surrounding relation with the exhaust pipe, and a generally V-shaped spray ring. The spray ring includes a first and second set of apertures that create diverging streams of cooling water. A first set of apertures creates an annularly disposed series of streams that are directed downstream and radially inward. These streams are generally directed toward the outer surface of the exhaust pipe structure which extends downstream of the spray ring. A second set of apertures creates an annularly disposed series of streams that are directed downstream and radially outward. These streams are generally directed toward the inner surface of the water jacket structure extending downstream of the spray ring. By providing a water jacketed exhaust component with a spray ring that creates diverging streams of cooling water, the present invention provides a water jacketed marine exhaust component that provides improved exhaust gas cooling over a wider range of engine operating conditions. An alternate embodiment includes a V-shaped spray ring configured to create converging streams of cooling water.