## 5 Flight Verification and Data Analysis
### Key Parameters of Fluid Network On-Orbit  
The working characteristics of the drive pump are the key to the thermal management system. The data and working characteristics of the drive pump under typical working conditions on orbit are analyzed. Figure 18a,b show the output flow rate and pressure difference time domain curves of the drive pump under typical working conditions.  
Figure 18a shows that the flow rate of the drive pump varies from 666.8 L/h to 674.7 L/h; the fluctuation regarding the flow parameters is about 8 L/h. At the same time, the output pressure difference is between 195.6 and 201.1 kPa; the fluctuation is about 5.5 kPa. The output characteristics of the drive pump have good stability, and the maximum fluctuation is 2.81%.  
Figure 19 shows the output characteristic data of the drive pump under the specific operating conditions of the system. The pump speed is stable at 9060-9120 rpm; the fluctuation on orbit is 0.66%.  
The ground test data for the drive pump are shown in Figure 19 and Table 3. Under the ground condition, the flow rate is 670.2-677.6 L/h and the output pressure difference is 193.2-196.2 kPa. Compared with the same working conditions on the ground, the average deviation of flow rate is 0.467% and the average deviation of pressure difference is 1.87%, showing good consistency.  
\begin{table}
\begin{tabular}{c c c} \hline \hline
**Indicator Type** & **Key Indicators** & **Parameter** \\ \hline \multirow{8}{*}{Performance indicators} & Flow rate of TCB (L/h) & \(\lesssim\)600 \\  & Operating pressure (kPa) & 150–180 \\  & Pressure difference in TCB (kPa) & \(\lesssim\)75 \\  & Temperature (\({}^{\circ}\)C) & 19–26 \\  & Flow rate of load equipment branch (L/h) & (60 \(\pm\) 10) \\  & Flow rate of payload rack (L/h) & 30–170 \\  & Temperature of heat exchanger (\({}^{\circ}\)C) & 16–22 \\  & Flow rate of heat exchanger (L/h) & 500 \(\pm\) 50 \\  & Air temperature inside module (\({}^{\circ}\)C) & 19–26 \({}^{\circ}\)C \\ \hline \hline \end{tabular}
\end{table}
Table 2: Index parameters and heat sink boundary of thermal management system.  
Figure 18: On-orbit working characteristics and ground data comparison of drive pump: (**a**) flow rate of pump on orbit; (**b**) pressure difference in pump on orbit.  
3 increased from 65.8 L/h to 70.1 L/h; at the same time, the total flow rate of the drive pump decreased from 665.8 L/h to 636.7 L/h; compared to pre-adjustment, the decrease is about 29.1 L/h.  
Similarly, as shown in Figure 20b, in the process of reducing the opening of branch 3 from 44% to 10%, the flow rate of the third branch decreased by about 54.4 L/h; the flow rate of the drive pump decreased from 636.5 L/h to 600 L/h and decreased by about 36.5 L/h. When the first branch is adjusted from 55% to 0, the flow rate decreased by 44.2 L/h and the flow rate of the drive pump decreased by 35 L/h. After the three valves are adjusted, the total flow rate of the whole rack is adjusted from 156 L/h to 0, and the flow rate of the drive pump is reduced by about 100 L/h.  
The pressure difference in pump bypass increased from 157 kPa to 175 kPa during the adjustment, increasing by about 18 kPa. In order to balance the pressure difference in TCB, the bypass valve is opened and the pressure difference is balanced. The bypass valve opening is adjusted from 20% to 36%; as shown in Figure 21, the bypass flow increased and the pressure difference in bypass recovered from 175 kPa to 160 kPa. The deviation is controlled at 3 kPa, and the control precision of pressure reaches 2%.