Research on aerodynamic design of an ejector nozzle based on TBCC integrated engine
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摘要:
针对引射喷管在设计点的型面设计参数开展了数值仿真研究,探究了主喷管长度、引射喷管喉道面积、喉道位置、扩张段面积变化规律对流动特性及推力性能的影响。研究表明:减小主喷管长度、适当增加引射喷管喉道面积、使引射喷管喉道位置向后移动、增加扩张段横截面积均有利于提升引射喷管的推力系数,而各型面参数对引射喷管的影响主要体现在主流膨胀程度及剪切层特性上。经验证,在全包线工作范围(马赫数为0~4)内引射喷管取得较优的气动性能,设计状态推力系数可达0.96。
Abstract:The effects of main design parameters of the ejector nozzle, including the length of the main nozzle, the throat area of the ejector nozzle, the position of the throat and the area of the expansion section, on the internal flow-field and thrust performance in the design state were studied through numerical simulations. The results showed that, in order to improve the thrust coefficient of the ejector nozzle, it is advantageous to reduce the length of the main nozzle, appropriately increase the throat area of the ejector nozzle, move the position of the ejector nozzle throat backward and increase the cross-sectional area of the expansion section in the ejector. The influence of various design parameters on the flow mechanism was mainly embodied in the degree of the mainstream expansion and the characteristics of the shear layer. It was verified that the ejector nozzle could achieve good aerodynamic performance within the full operating range (Mach number of 0 to 4). In the design state, the thrust coefficient could reach 0.96.
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表 1 引射喷管的主要型面参数
Table 1. Major profile parameters of ejector nozzle
无量纲参数 数值 主喷管出口直径Dp/D 0.72 引射喷管喉道直径Dt/D 1.12 主喷管等直段长度L/D 0.20 引射喷管喉道直径距离
主喷管出口的轴向距离(Lt−Lp)/Dp−0.06 引射喷管长度Le/D 1.36 辅助进气门旋转角度θ/(°) 0~30 尾缘角β/(°) 4 表 2 来流条件
Table 2. Incoming-flow conditions
参数 数值 马赫数Ma 4 环境压力/Pa 2971.75 环境温度/K 926.35 主流落压比 75 主流总温/K 2100 表 3 不同主喷管长度时引射喷管的性能参数
Table 3. Performance parameters of ejector nozzle with different main nozzle lengths
L/D 动量推力Fv/N 推力系数Cf 总压恢复系数σ 0.20 62447.77 0.9426 0.9268 0.27 62425.72 0.9392 0.9364 0.34 62060.10 0.9333 0.9416 0.48 60330.20 0.9160 0.9502 0.54 59073.75 0.9065 0.9593 0.61 57607.59 0.8999 0.9690 表 4 不同引射喷管喉道面积时引射喷管性能参数
Table 4. Performance parameters of ejector nozzle with different throat areas
Dt/D 动量推力Fv/N 推力系数Cf 总压恢复系数σ 0.98 61130.57 0.9261 0.9566 1.01 61148.43 0.9261 0.9545 1.04 61172.31 0.9264 0.9518 1.06 60967.88 0.9262 0.9419 1.09 61256.22 0.9282 0.9453 1.12 61114.93 0.9286 0.9386 表 5 不同喉道位置下引射喷管性能参数
Table 5. Performance parameters of ejector nozzle with different throat positions
ϛ 动量推力Fv/N 推力系数Cf 总压恢复系数σ 0.06 60910.77 0.9504 0.9209 0.04 61605.00 0.9508 0.9406 0.22 61189.24 0.9481 0.9205 0.32 61370.51 0.9471 0.9200 0.41 61645.96 0.9460 0.9215 0.51 62009.16 0.9442 0.9246 表 6 不同尾缘角引射喷管性能参数
Table 6. Performance parameters of ejector nozzle with different tail angles
β/(°) 动量推力Fv/N 推力系数Cf 总压恢复系数σ 4 61748.99 0.9522 0.9255 8 62448.76 0.9490 0.9289 12 62929.94 0.9473 0.9317 16 63226.47 0.9468 0.9346 20 63337.15 0.9469 0.9368 表 7 全包线工作范围内引射喷管性能参数
Table 7. Performance parameters of ejector nozzle in full operation range
Ma 引射系数ω 推力系数Cf 总压恢复系数σ 0 0.017 0.9085 0.89 0.9 0.022 0.9670 0.87 1.1 0.154 0.9808 0.88 3 0.010 0.9819 0.94 4 0.032 0.9611 0.92 -
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