李秋锋, 李密, 高翔, 等. 分开排气系统特性校准试验研究[J]. 实验流体力学, 2023, 37(6): 61-69. DOI: 10.11729/syltlx20220056
引用本文: 李秋锋, 李密, 高翔, 等. 分开排气系统特性校准试验研究[J]. 实验流体力学, 2023, 37(6): 61-69. DOI: 10.11729/syltlx20220056
LI Q F, LI M, GAO X, et al. Experimental study on characteristic calibration of separated exhaust system[J]. Journal of Experiments in Fluid Mechanics, 2023, 37(6): 61-69. DOI: 10.11729/syltlx20220056
Citation: LI Q F, LI M, GAO X, et al. Experimental study on characteristic calibration of separated exhaust system[J]. Journal of Experiments in Fluid Mechanics, 2023, 37(6): 61-69. DOI: 10.11729/syltlx20220056

分开排气系统特性校准试验研究

Experimental study on characteristic calibration of separated exhaust system

  • 摘要: 飞行试验时,采用燃气发生器法间接获取航空发动机飞行推力。为提高飞行推力计算精度,需准确获取航空发动机排气系统特性。采用某大涵道比分开排气系统缩比模型开展了实验室校准箱吹风试验及数值模拟研究,结果表明:采用实验室校准箱吹风试验、数值模拟获取的单独内涵喷管特性趋势一致、数值接近,最大内涵喷管压比为1.44时,喷管流量和推力偏差分别为0.73%、0.18%;通过试验和数值模拟获取的内外涵分开排气系统特性趋势一致、数值接近,最大外涵喷管压比为1.46时,喷管流量和推力偏差分别为0.64%、0.18%;对大涵道比分开排气系统物理模型与几何模型进行合理简化后,试验和数值模拟获取的分开排气系统特性偏差满足工程精度要求。

     

    Abstract: In flight testing, the aeroengine flight thrust is indirectly obtained by the gas generator method. In order to improve the calculation accuracy of the flight thrust, it is necessary to accurately obtain the characteristics of the exhaust system. The laboratory calibration test and numerical simulation research were carried out by using the large bypass ratio separated exhaust system scale model. The results show that: the core nozzle characteristics obtained by the two methods are consistent, and the values are close. When the maximum core nozzle pressure ratio is 1.44, the deviations of the mass flow and the thrust are 0.73% and 0.18%, respectively; the characteristics of the separated exhaust system obtained by the two methods have the same trend and close values. When the max bypass nozzle pressure ratio equals 1.46, the deviations of the mass flow and the thrust are 0.64% and 0.18%, respectively; when the physical model and geometric model of the large bypass ratio separated exhaust system are reasonably simplified, the characteristic deviations of the separated exhaust system obtained by the two methods are in good agreement.

     

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