Volume 36 Issue 1
Jan.  2021
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Article Navigation >  Journal of Aerospace Power  > 2021  >  36(1): 205-215
DAN Zhihong, ZHANG Song, QIAN Qiumeng, ZHANG Jianping, GUO Yuying. Influences of exhaust diffuser on chamber pressure and control method for high altitude cell[J]. Journal of Aerospace Power, 2021, 36(1): 205-215. doi: 10.13224/j.cnki.jasp.2021.01.023
Citation: DAN Zhihong, ZHANG Song, QIAN Qiumeng, ZHANG Jianping, GUO Yuying. Influences of exhaust diffuser on chamber pressure and control method for high altitude cell[J]. Journal of Aerospace Power, 2021, 36(1): 205-215. doi: 10.13224/j.cnki.jasp.2021.01.023
shu

Influences of exhaust diffuser on chamber pressure and control method for high altitude cell

doi: 10.13224/j.cnki.jasp.2021.01.023
  • 1.

    Key Laboratory of High-altitude Simulation Technology,Sichuan Gas Turbine Establishment,Aero Engine Corporation of China,Mianyang Sichuan 621703,China

  • 2.

    Sichuan Gas Turbine Establishment,Aero Engine Corporation of China,Mianyang Sichuan 621703,China

  • 3.

    School of Manufacturing Science and Engineering,Southwest University of Science and Technology,Mianyang Sichuan 621010,China

  • 4.

    School of Information Engineering,Southwest University of Science and Technology,Mianyang Sichuan 621010,China

  • Received Date: 2020-04-27
  • Publish Date: 2021-01-28
    Abstract
  • In order to study the influences of flow characteristics of exhaust diffuser on the rear chamber pressure control of altitude test facilities, the flow characteristics of exhaust diffuser were analyzed and the model was constructed by ANSYS191 to reveal the true physical process. When the secondary mass flow rate was 20 kg/s, the changes of the rear chamber pressure were numerically simulated under different exhaust diffuser back pressure and main flow rate, and the model of the back pressure of exhaust diffuser, main flow rate and rear chamber pressure was obtained by spline interpolation. A simulation model of the pressure control system of rear chamber of high altitude platform was established to analyze the influences of the flow characteristics of the exhaust diffuser on the pressure regulation under different regulation modes and different control methods. The results showed that the secondary flow had great influences on the primary flow, and the velocity reached maximum at the engine nozzle exit. Then the velocity decreased quickly and declined by 88% in the mixing section of exhaust diffuser. However, the pressure increased gradually to the boundary value along axial direction of exhaust diffuser. In engine transition tests, the flow characteristics of exhaust diffuser brought great disturbances to the rear chamber pressure control system, and the regulating precision and disturbance rejection of rear chamber pressure can’t be assured by linear PID controller. However, nonlinear PID control can not only reduce the influence of the exhaust diffuser flow characteristics on the pressure regulating and reject the engine flow disturbances, but also ensure that the transient response is fast, the overshoot is small and the regulation accuracy is high.

     

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