Full-Flow Simulation-Based Analysis and Experimental Validation of the Overall Performance of Micro-Turbojet Engine

Abstract The overall performance of the micro-turbojet engine (MTE) is typically assessed through parametric modeling, methods of component series calculation (CSC), and prototype experiments. This paper proposes a new method—torque balance determination (TBD) method. It is based on computational fluid dynamics (CFD) theory and can automatically determine the difference in torque between the compressor and turbine, while ensuring systemic balance. The performance and flow field of the MTE were assessed based on TBD method under rated operating conditions. Compared with the factory design parameters (FDP), the errors of the thrust and exhaust temperature obtained were 1% and 2.4%, respectively, which proved the accuracy of the TBD method. Additionally, a test platform for the MTE was built to further verify the accuracy of the TBD method. The high confidence level confirms the accuracy of the experimental plan and results. Moreover, errors between the experimental results and TBD method were small, which were 0.3% (outlet total temperature) and 4.2% (thrust). Finally, compared with the CSC method, the TBD method can significantly reduce the thrust error from 7.6% to 1%, while the errors of other parameters are not significantly different, reducing the impact of error accumulation. The above error analysis verified the accuracy and reasonableness of the TBD method. The proposed method can be used to establish a simulation model of the entire engine and accurately analyze its performance during its design. This is a feasible means of optimizing the performance of the MTE and shortening its development cycle.