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Tuesday, December 27, 2005
Sunday, December 25, 2005
Flow of gases in exhaust tubes: physical conditions, factors (gases, heat, sound)
When exhaust gases leave the combustion chamber their temperature is around 900°C and they travel at speeds lower than the speed of sound. Therefore due to the explosions in the combustion chamber they give off heat, and they give off sound due to pressure variations (compression and decompression of air).
When exhaust gases leave the combustion chamber their temperature is around 900°C and they travel at speeds lower than the speed of sound. Therefore due to the explosions in the combustion chamber they give off heat, and they give off sound due to pressure variations (compression and decompression of air).
Why do internal combustion engines, either 4-stroke or 2-stroke, even need exhaust systems?
Internal combustion engines need exhaust systems mainly for the following reasons:
- to improve power and torque delivery characteristics
- to lead hot combusted exhaust gases away
- to muffle the sound, i.e. reduce noise emissions (where the intended use of the engine has to be taken into consideration)
Saturday, December 24, 2005
歌詞 - Colors
I see green
I see red
I see blue
I see black
I see coffee on the table
And our black and white photo
And over the green mountain
I can see all these rainbow
Lets sing a song in red
Lets sing a song in blue
Lets sing a song with colour in you
Lets sing a song in black
Lets sing a song in blue
Without the rainbow
I'd still sing a song with you
I see red
I see blue
I see black
I see coffee on the table
And our black and white photo
And over the green mountain
I can see all these rainbow
Lets sing a song in red
Lets sing a song in blue
Lets sing a song with colour in you
Lets sing a song in black
Lets sing a song in blue
Without the rainbow
I'd still sing a song with you
