Analysis of differential influence of hot jet effect in supersonic and hypersonic flow
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摘要:
针对不同来流条件下热喷效应导致的冷/热喷差异规律不同的问题,通过求解三维多组元雷诺平均Navier-Stokes(RANS)方程数值模拟典型飞行器外形轨控喷流干扰流场,研究了喷流温度对干扰流场及气动特性的影响规律,分析了不同来流马赫数与飞行高度条件的冷/热喷干扰差异规律。研究表明:喷流温度对干扰流场的影响是质量流量与能量流量的耦合影响机制,总焓比高于1时,喷流能量流量的影响较质量流量更明显,总焓比低于1时,喷流质量流量的影响较能量流量更明显;随着来流马赫数增加,总焓比下降,喷流质量流量的影响较能量流量增强,质量流量大的冷喷干扰流场范围逐渐大于热喷,并使得冷喷干扰产生的力干扰因子逐渐大于热喷;随着飞行高度增加,总焓比不变,喷流质量流量与能量流量的影响占比不变,冷/热喷干扰差异的定性规律不变,但来流动压减小,喷流干扰力/力矩整体为减小趋势,并使得冷/热喷干扰的力干扰因子与轨控偏移量差异整体为减小趋势。
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关键词:
- 超/高超声速流 /
- 反作用控制系统(RCS) /
- 热喷效应 /
- 分离流动 /
- 气动干扰
Abstract:In response to the issue of different cold/hot jet differences caused by the hot jet effect under various incoming flow conditions, the numerical investigation of jet temperature effects on the interaction flow field and aerodynamic characteristics was studied by solving the three-dimensional multi-component Reynolds-averaged Navier-Stokes (RANS) equations to simulate the typical aircraft configuration's divert jet interaction flow field. The differences in cold/hot jet interaction under various incoming Mach numbers and flight altitude conditions were analyzed. The study showed that the impact of jet temperature on the interaction flow field exhibited a coupled influence mechanism of mass and energy fluxes. When the total enthalpy ratio was higher than 1, the influence of jet energy flux was more significant than the mass flux. Conversely, when the total enthalpy ratio was lower than 1, the influence of jet mass flux was more significant than the energy flux. As the incoming Mach number increased, the total enthalpy ratio decreased, and the influence of jet mass flux became more pronounced than that of energy flux, and the interaction flow field range of cold jets with large mass flux gradually exceeded that of hot jets, and the force interaction factor caused by cold jets gradually exceeded that of hot jets. As the flight altitude increased, the total enthalpy ratio was constant, and the proportional contribution of jet mass flux and energy flux kept unchanged, the qualitative rule of cold/hot jet interaction differences remained unchanged, but the reduction in incoming dynamic pressure resulted in an overall decreasing trend of the jet interaction force and moment, it also led to an overall decreasing trend in the difference between the force interaction factor and the shift amount of jet force center of cold and hot jets interaction.
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喷流 Maj p0j/MPa T0j/K γj Rj/(J/(kg·K)) 热喷 1.0 12 2300 1.235 319 冷喷 1.0 12 293 1.4 287 表 2 喷流条件
Table 2. Jet parameters
喷流 pj/kPa φj/ kPa T0j/K γj Rj/(J/(kg· K)) 热喷 133.3 5.01 3200 1.257 400 冷喷 133.3 5.01 293 1.4 287 表 3 不同网格气动力/力矩计算结果
Table 3. Aerodynamic results of different grids
网格 Fx/N Fy/N Mz/(N·m) 1 1352.32 −164.77 67.29 2 1358.44 −169.15 70.04 3 1361.66 −170.25 76.58 4 1361.64 −170.11 77.15 表 4 不同总温喷流干扰流场相似参数
Table 4. Similarity parameters of interaction flow field with different total temperatures jet
T0j/K $ {{{{\dot m}_{\text{j}}}} / {{{\dot m}_\infty }}} $ $ {{{h_{0{\text{j}}}}} / {{h_{0\infty }}}} $ $ {\dot E_{\text{j}}}/{\dot E_\infty } $ 400 0.369 0.599 0.221 800 0.261 1.199 0.313 1300 0.205 1.948 0.399 1600 0.185 2.397 0.442 2400 0.151 3.596 0.542 3200 0.130 4.795 0.625 表 5 不同马赫数条件的总焓比
Table 5. Total enthalpy ratio under different Mach number conditions
T0j/K Ma∞=3 Ma∞=5 Ma∞=7 400 1.284 0.599 0.333 800 2.569 1.199 0.666 1300 4.174 1.948 1.082 1600 5.137 2.397 1.332 2400 7.706 3.596 1.998 3200 10.27 4.795 2.664 表 6 冷/热喷流干扰流场相似参数
Table 6. Similarity parameters of cold jet and hot jet interaction flow field
Ma∞ $ {{{{\dot m}_{\text{j}}}}/{{{\dot m}_\infty }}} $ $ {{{h_{0{\text{j}}}}}/{{h_{0\infty }}}} $ $ {\dot E_{\text{j}}}/{\dot E_\infty } $ 热喷 冷喷 热喷 冷喷 热喷 冷喷 3 0.217 0.928 10.27 0.483 2.233 0.448 4 0.163 0.696 6.849 0.322 1.117 0.224 5 0.130 0.557 4.795 0.225 0.625 0.126 6 0.109 0.464 3.508 0.165 0.381 0.077 7 0.093 0.398 2.664 0.125 0.248 0.050 8 0.082 0.348 2.084 0.098 0.170 0.034 -
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