Abstract
The main data source for the verification of surge detection methods still rely on test rigs of the compressor or the whole engine, which makes the development of models of the whole engine surge process an urgent need to replace the high-cost and high-risk surge test. In this paper, a novel real-time surge model based on the surge mechanism is proposed. Firstly, the turboshaft engine component level model (CLM) and the classic surge dynamic model, Moore-Greitzer (MG) model is established. Then the stability of the MG model is analyzed and the compressor characteristics in the classical MG model are extended to establish the extended MG model. Finally, this paper considers the coupling relationship of the compressor’s rotor speed, mass flow and pressure between CLM and the extended MG model to establish the real-time model of the turboshaft engine with surge process. The simulation results show that this model can realize the whole surge process of the turboshaft engine under multiple operating states. The change characteristics of the rotor speed, compressor outlet pressure, mass flow, exhaust gas temperature and other parameters are consistent with the test data, which means that the model proposed can be further applied to the research of surge detection and anti-surge control.
Highlights
As a typical unhealthy state of the turboshaft engine, surge seriously affects its performance and safety
The above analysis shows that the time of two surges detected by the surge detection algorithm is the same as the time of entering and exiting surge set by the model, which confirms that the surge process simulated by the turboshaft engine surge real-time model established in this paper is consistent with the characteristics of parameter changes in the
The above analysis shows that the time of two surges detected by the surge detection algorithm is the same as the time of entering and exiting surge set by the model, which confirms that the surge process simulated by the turboshaft engine surge real-time model established in this paper is consistent with the characteristics of parameter changes in the actual engine surge process
Summary
As a typical unhealthy state of the turboshaft engine, surge seriously affects its performance and safety. Yang Fan et al [21] established the turbofan model of post-stall and surge which simulates the flow coefficient and pressure rise ratio of the compressor during surge by solving the two-dimensional Euler equations with source terms All these models regard the engine’s each component as an equivalent cavity unit, and the whole engine is calculated by stacking these units step by step, which simplifies the interaction with other components, and pays more attention to the dynamic process of stall and surge at a steady-state point of the engine, while the model itself lacks the steady-state and dynamic simulation capability of the whole envelope under different operating conditions. After the dynamic point is solved, the rotor dynamics is used to update the rotor speed in each simulation cycle
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