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Enclosure Design & Construction
port fitting difficulty, help please!
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<blockquote data-quote="shredder2" data-source="post: 8656909" data-attributes="member: 674047"><p>Yeah... I'm still learning about this everyday.</p><p></p><p>Since increasing the area of a port quickly produces very long ports, the most effective means of moving more air is to increase the air velocity.Ports operating below about <span style="color: #666666">10 m/sec</span> generally have no problems with turbulence and compression. As velocity is increased beyond this, turbulence occurs as air exiting the port is forced to slow too quickly as it encounters the surrounding still air.Flared ports cause the airflow to expand and loose speed in a controlled fashion, allowing higher speeds without turbulence. This method targets the air in the <span style="color: #666666">"boundary layer"</span>, which is close to the walls of the port.Increasing velocity even further, the air in the <span style="color: #666666">"core"</span> of the port becomes turbulent. Flares are unable to help with this problem, which represents the limiting velocity for the port. By this stage the port is beginning to present a different load to the system, resulting in de-tuning and subsequent loss of output, known as compression.</p><p></p><p><span style="color: #666666">Area Ratio</span> is the cross-sectional area (CSA) of the port opening, divided by the CSA of the unflared section of the port. It gives an indication of how quickly the air has to change velocity as it exits a flared port, and is a more useful measure than flare radius alone.</p><p></p><p><strong>Gramps, any given sized aero with any real velocity will benefit from a flare is what I read above (and the bigger the flare the better)... but there is a point of compression (I use 35m/s) and compromises are made sometimes. </strong></p><p></p><p><strong>Now I'm gonna get flamed by others most likely... lol</strong></p></blockquote><p></p>
[QUOTE="shredder2, post: 8656909, member: 674047"] Yeah... I'm still learning about this everyday. Since increasing the area of a port quickly produces very long ports, the most effective means of moving more air is to increase the air velocity.Ports operating below about [COLOR=#666666]10 m/sec[/COLOR] generally have no problems with turbulence and compression. As velocity is increased beyond this, turbulence occurs as air exiting the port is forced to slow too quickly as it encounters the surrounding still air.Flared ports cause the airflow to expand and loose speed in a controlled fashion, allowing higher speeds without turbulence. This method targets the air in the [COLOR=#666666]"boundary layer"[/COLOR], which is close to the walls of the port.Increasing velocity even further, the air in the [COLOR=#666666]"core"[/COLOR] of the port becomes turbulent. Flares are unable to help with this problem, which represents the limiting velocity for the port. By this stage the port is beginning to present a different load to the system, resulting in de-tuning and subsequent loss of output, known as compression. [COLOR=#666666]Area Ratio[/COLOR] is the cross-sectional area (CSA) of the port opening, divided by the CSA of the unflared section of the port. It gives an indication of how quickly the air has to change velocity as it exits a flared port, and is a more useful measure than flare radius alone. [B]Gramps, any given sized aero with any real velocity will benefit from a flare is what I read above (and the bigger the flare the better)... but there is a point of compression (I use 35m/s) and compromises are made sometimes. [/B] [B]Now I'm gonna get flamed by others most likely... lol[/B] [/QUOTE]
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port fitting difficulty, help please!
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