Correction d'un signe et du diagramme p-V du moteur diesel

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Guyot 2020-01-15 16:57:05 +01:00
parent 04574380b3
commit e5983e81ea
7 changed files with 1200 additions and 1493 deletions

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@ -1230,6 +1230,9 @@ Le fonctionnement d'un moteur diésel n'est pas très différent de celui d'un m
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@ -1243,7 +1246,7 @@ Comme le cycle d'Otto, le cycle Diesel est donc aussi constitué de deux adiabat
\[Q_{abs}=n\cdot C_P\cdot (T_3-T_2)\]
et, comme chaleur rejetée~:
\[Q_{rej}=n\cdot C_V\cdot (T_1-T_4)\]
La différence constitue le travail fourni par le système pendant le cycle, une partie étant produite par le gaz pendant le temps moteur et une autre absorbée par celui-ci pendant la compression. Attention, \(Q_{rej}>0\) et il faut donc soit additionner les deux chaleur pour avoir le travail qui constitue leur différence ou soustraire l'opposé de la chaleur rejetée, soit \(|Q_{rej}|=n\cdot C_V\cdot (T_4-T_1)\). On a donc~:
La différence constitue le travail fourni par le système pendant le cycle, une partie étant produite par le gaz pendant le temps moteur et une autre absorbée par celui-ci pendant la compression. Attention, \(Q_{rej}<0\) et il faut donc soit additionner les deux chaleur pour avoir le travail qui constitue leur différence ou soustraire l'opposé de la chaleur rejetée, soit \(|Q_{rej}|=n\cdot C_V\cdot (T_4-T_1)\). On a donc~:
\begin{align*}
A&=Q_{abs}-Q_{rej}\\
&=n\cdot C_P\cdot (T_3-T_2)-n\cdot C_V\cdot (T_4-T_1)