For the Brayton cycle, the maximum temperature in the cycle is limited to T3 and the minimum temperature is set to T1. At maximum work condition, the optimum pressure ratio will be
1
\({\left( {\frac{{{T_3}}}{{{T_1}}}} \right)^{\frac{\gamma }{{2\left( {\gamma - 1} \right)}}}}\)
2
\({\left( {\frac{{{T_3}}}{{{T_1}}}} \right)^{\frac{\gamma-1 }{{2\left( {\gamma } \right)}}}}\)
3
\({\left( {\frac{{{T_3}}}{{{T_1}}}} \right)^{\frac{\gamma }{{\left( {\gamma - 1} \right)}}}}\)
4
\({\left( {\frac{{{T_3}}}{{{T_1}}}} \right)^{\frac{\gamma - 1 }{{\left( {\gamma} \right)}}}}\)