# Thermodynamic Analysis and Performance Evaluation of Microjet Engines in Gas Turbine Education
## 5 Results
For the JetCat P80, the percentage data are calculated by comparing the data of each working regime to the maximum regime [41; 42]. This approach ensures a consistent basis for comparison, highlighting the relative performance of each engine model and operating condition. Figure 8: Ideal temperatures ratio for JetCat and AMT micro jet models. Figure 9: Ideal temperatures ratio for JetCat P80 micro jet model. The following mathematical relations define the percentage parameters:  
\[dprm_{eng}=\frac{prm}{prm_{ipm}}\cdot 100\quad[\%] \tag{28}\]  
\[dprm_{p80}=\frac{prm}{prm_{max}}\cdot 100\quad[\%] \tag{29}\]  
Figures 10 and 11 present the percentage variation of power of turbine \((P_{T})\), jet nozzle \(\left(P_{f}\right)\), and expansion process \((P_{E})\), sorted by thrust, for JetCat and AMT models and the JetCat P80 model. \begin{table}
\begin{tabular}{c c c c c c c} \hline
**NE** & **\(\Delta\)dITt** & **\(\Delta\)dhJ** & **\(\Delta\)dTT** & **\(\Delta\)dTE** & **\(\Delta\)dTJ.id** & **\(\Delta\)dTJ** \\ \hline
**rpm** & **\%** & **\%** & **\%** & **\%** & **\%** & **\%** \\ \hline
34,951 & \(-1.15\) & \(1.15\) & \(0.23\) & \(0.30\) & \(0.00\) & \(0.07\) \\
47,160 & \(-1.30\) & \(1.30\) & \(0.35\) & \(0.51\) & \(-0.01\) & \(0.18\) \\
55,320 & \(-1.34\) & \(1.34\) & \(0.46\) & \(0.67\) & \(0.00\) & \(0.23\) \\
68,295 & \(-1.40\) & \(1.40\) & \(0.69\) & \(1.01\) & \(0.00\) & \(0.36\) \\
79,369 & \(-1.47\) & \(1.47\) & \(0.91\) & \(1.35\) & \(0.02\) & \(0.48\) \\
88,787 & \(-1.52\) & \(1.52\) & \(1.14\) & \(1.65\) & \(0.01\) & \(0.59\) \\
97,786 & \(-1.59\) & \(1.59\) & \(1.32\) & \(1.94\) & \(-0.01\) & \(0.75\) \\
105,423 & \(-1.64\) & \(1.64\) & \(1.49\) & \(2.19\) & \(0.02\) & \(0.85\) \\
112,706 & \(-1.69\) & \(1.69\) & \(1.62\) & \(2.43\) & \(0.02\) & \(1.01\) \\
115,675 & \(-1.71\) & \(1.71\) & \(1.65\) & \(2.50\) & \(0.03\) & \(1.07\) \\ \hline \end{tabular}
\end{table} 
Table 13: Percentage differences for JetCat P80 model. \begin{table}
\begin{tabular}{c c c c c c c} \hline
**Engine** & **\(\Delta\)dITt** & **\(\Delta\)dhJ** & **\(\Delta\)dTT** & **\(\Delta\)dTE** & **\(\Delta\)dTJ.id** & **\(\Delta\)dTJ** \\ \cline{2-7}
**Model** & **\%** & **\%** & **\%** & **\%** & **\%** & **\%** \\ \hline P80-SE & \(0.17\) & \(-0.17\) & \(1.50\) & \(2.91\) & \(0.03\) & \(1.65\) \\ P100-RX & \(-0.57\) & \(0.57\) & \(3.42\) & \(5.54\) & \(0.07\) & \(2.64\) \\ P130-RX & \(-1.14\) & \(1.14\) & \(3.77\) & \(5.79\) & \(0.07\) & \(2.58\) \\ P160-RXi-B & \(-2.57\) & \(2.57\) & \(4.64\) & \(6.05\) & \(0.08\) & \(2.06\) \\ Pegasus HP & \(-1.06\) & \(1.06\) & \(4.23\) & \(6.18\) & \(0.08\) & \(2.58\) \\ P180-NX & \(-2.43\) & \(2.43\) & \(4.09\) & \(5.70\) & \(0.08\) & \(2.26\) \\ P200-RX & \(-3.16\) & \(3.16\) & \(4.72\) & \(6.09\) & \(0.11\) & \(2.11\) \\ P220-RXi & \(-1.96\) & \(1.96\) & \(4.32\) & \(6.27\) & \(0.09\) & \(2.74\) \\ Olympus HP & \(-2.30\) & \(2.30\) & \(3.45\) & \(5.31\) & \(0.09\) & \(2.43\) \\ P300-PRO & \(-0.80\) & \(0.80\) & \(2.41\) & \(4.73\) & \(0.07\) & \(2.89\) \\ Titan & \(-3.88\) & \(3.88\) & \(3.56\) & \(5.13\) & \(0.11\) & \(2.20\) \\ P400-PRO & \(-0.79\) & \(0.79\) & \(2.92\) & \(5.53\) & \(0.08\) & \(3.30\) \\ P500-PRO GL & \(-0.07\) & \(0.07\) & \(2.68\) & \(5.18\) & \(0.08\) & \(3.14\) \\ P550-PRO GL & \(0.25\) & \(-0.25\) & \(2.20\) & \(4.70\) & \(0.06\) & \(3.12\) \\ Nike & \(-2.89\) & \(2.89\) & \(3.00\) & \(4.78\) & \(0.08\) & \(2.43\) \\ P1000-PRO & \(-1.68\) & \(1.68\) & \(1.93\) & \(3.27\) & \(0.07\) & \(1.78\) \\ Lynx & \(-2.08\) & \(2.08\) & \(2.42\) & \(4.02\) & \(0.08\) & \(2.15\) \\ \hline \end{tabular}
\end{table} 
Table 12: Percentage differences for JetCat and AMT micro jet models. Figures 14 and 15 present the percentage variation of jet nozzle outlet gas velocity (\(C_{5}\)), velocity coefficient \(\left(\varphi_{I}\right)\), and thermal efficiency \(\left(\eta_{te}\right)\), sorted by thrust, for JetCat and AMT models and the turbine total expansion degree \(\left(\delta_{T.t}\right)\) for the JetCat P80 model instead of the velocity coefficient.