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

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Guyot 2020-01-14 21:43:01 +01:00
parent 21f71aaf75
commit 04574380b3
7 changed files with 1234 additions and 1464 deletions

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@ -1168,6 +1168,12 @@ La pression reste donc constante et le volume revient à son minimum \(V_2\).
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@ -1183,7 +1189,7 @@ Le cycle d'Otto est donc essentiellement constitué de deux adiabatiques et de d
\[Q_{abs}=n\cdot C_V\cdot (T_3-T_2)\]
Évidemment la chaleur est rejetée pendant l'échappement. De la même manière, on peut écrire~:
\[Q_{rej}=n\cdot C_V\cdot (T_1-T_4)\]
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~:
\[A=Q_{abs}-Q_{rej}=n\cdot C_V\cdot (T_3-T_2-T_4+T_1)\]
Le rendement est alors~:
\begin{align*}