## 3 Properties of the Mixture of Jet A-1 Aviation Kerosene and FAME Biofuel
\begin{table}
\begin{tabular}{c c c c c} \hline  & & & **Aviation** & **FAME PT** \\
**No.** & **Parameter** & **Unit** & **Kerosene Jet** & **According to** \\
**A-1, According to SN 050100** & **EN14214** \\ \hline
**1.** & **Density at 15 \({}^{\circ}\)C** & kg.m\({}^{-3}\) & 810 & 882 \\
**2.** & **Acid number** & mgKOH/g & 0.003 & 0.23 \\
**3.** & **Flash point** & \({}^{\circ}\)C & 64 & 168 \\
**4.** & **Sulfur content** & mg.kg\({}^{-1}\) & 0.01 & 0.1 \\
**5.** & **Kinematic viscosity** & mm\({}^{2}\).s\({}^{-1}\) & 5.23 \({}^{2}\) & 4.5 \({}^{1}\) \\
**6.** & **Calorific value** & MJ.kg\({}^{-1}\) & 43.292 & 39.0 \\ \hline \end{tabular} Note: \({}^{1}\) at 40 \({}^{\circ}\)C; \({}^{2}\) at -20 \({}^{\circ}\)C.  
\end{table} 
Table 4: Comparison of some parameters of Jet A-1 aviation kerosene and FAME biofuel. \begin{table}
\begin{tabular}{l c c c c c c c c c c} \hline
**Mixture No.** & **1.** & **2.** & **3.** & **4.** & **5.** & **6.** & **7.** & **8.** & **9.** & **10.** & **11.** \\ \hline Jet A-1/FAME & 100:0 & 90:10 & 80:20 & 70:30 & 60:40 & 50:50 & 40:60 & 30:70 & 20:80 & 10:90 & 0:100 \\ Density & 810 & 817.2 & 824.4 & 831.6 & 838.8 & 846 & 853.2 & 855.4 & 867.6 & 874.8 & 882 \\ \hline \end{tabular}
\end{table} 
Table 5: Composition of the mixture of aviation kerosene Jet A-1 and FAME. t\({}_{0}\), total air temperature behind the compressor t\({}_{2t}\), total gas temperature in front of the gas turbine t\({}_{3t}\), total gas temperature behind the gas turbine t\({}_{4t}\), total air pressure behind the compressor p\({}_{2t}\), total gas pressure in front of gas turbine p\({}_{3t}\), fuel flow rate Q\({}_{fuel}\) (fuel mixture of aviation kerosene Jet A-1 and biofuel FAME (Table 5)), revolutions speed n, and thrust force F\({}_{\rm{T}}\). The mentioned parameters were sensed by temperature and pressure sensors, which were placed directly on the experimental engine and sent to the computer through converters, where they were processed into a graphic course of parameter changes depending on time. At the same time, the parameter values in the specified time intervals were processed in tabular form. The graphical waveform of the small jet motor parameter variation was the result of the LABVIEW program. The Effect of Different Concentrations of Mixtures of FAME Biofuel and Jet A-1 Aviation Kerosene on the Performance of SJE-20  
During experiments carried out on SJE-20 with different proportions of FAME biofuel mixed with Jet A-1 aviation kerosene, changes in measured thermodynamic parameters and their influence on its operational properties were monitored. For the purposes of the measurements, the SJE-20 was set to a reduced mode (n = 46.700 min\({}^{-1}\)). The time of the measurement cycles was in the range of 45 \(\pm\) 5 s. The concentration of FAME biofuel in the mixture with Jet A-1 aviation kerosene was varied by 10%. For each concentration of the mixture of FAME biofuel and Jet A-1 aviation kerosene, a minimum of three measurements were performed, from which one representative graphical course was selected for evaluation. In addition to the continuously measured parameters were the maximum gas temperature in front of the gas turbine t\({}_{3t,\max. }\), the maximum gas temperature behind the gas turbine t\({}_{4t,\max. }\), and the time of their reaching. Before each experimental measurement, the thermal state of the experimental SJE-20 was evaluated by determining the engine temperature in the region of its gas turbine t\({}_{3}\). For easier evaluation of the individual parameters, the individual curves were processed in tabular form for the values read in the 20 th, 25 th, 30 th, 35 th, 40 th, and 45 th seconds after starting the engine. The exact values of the parameters were obtained from the computer's tabular record of the course of the experiments.