| 排气扩压器对高空舱压的影响与控制方法 |
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| 引用本文： | 但志宏,张松,钱秋朦,张健平,郭玉英.排气扩压器对高空舱压的影响与控制方法[J].航空动力学报,2021,36(1):205-215. |
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| 作者姓名： | 但志宏 张松 钱秋朦 张健平 郭玉英 |
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| 作者单位： | 中国航空发动机集团有限公司四川燃气涡轮研究院高空模拟技术重点实验室,四川绵阳621703;中国航空发动机集团有限公司四川燃气涡轮研究院,四川绵阳621703;西南科技大学制造科学与工程学院,四川绵阳621010;西南科技大学信息工程学院,四川绵阳621010 |
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| 基金项目： | 航空发动机高空模拟技术重点实验室创新基金(18zd9101); 四川省科技计划项目(2019YJ0292) |
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| 摘 要： | 为研究排气扩压器流动特性对高空舱后舱压力控制的影响,采用ANSYS19.1对排气扩压器进行数学建模和流场数值模拟分析,揭示其内部实际流动的物理过程;在次流质量流量为20kg/s时,数值模拟不同排气扩压器背压和主流流量时后舱压力的变化规律,并通过样条插值得到排气扩压器背压、主流流量和后舱压力三者关系模型;建立高空舱后舱压...
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| 关 键 词： | 高空舱 后舱压力系统 排气扩压器 流动特性 压力调节 |
| 收稿时间： | 2020/4/27 0:00:00 |
Influences of exhaust diffuser on chamber pressure and control method for high altitude cell |
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| 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. |
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| Authors: | DAN Zhihong ZHANG Song QIAN Qiumeng ZHANG Jianping GUO Yuying |
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| Institution: | 1.Key Laboratory of High-altitude Simulation Technology,Sichuan Gas Turbine Establishment,Aero Engine Corporation of China,Mianyang Sichuan 621703,China2.Sichuan Gas Turbine Establishment,Aero Engine Corporation of China,Mianyang Sichuan 621703,China3.School of Manufacturing Science and Engineering,Southwest University of Science and Technology,Mianyang Sichuan 621010,China4.School of Information Engineering,Southwest University of Science and Technology,Mianyang Sichuan 621010,China |
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| 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 ANSYS191 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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| Keywords: | high altitude cell rear chamber pressure system exhaust diffuser flow characteristics pressure regulation |
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