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针对燃烧加热地面试验设备存在的工质污染问题,采用数值模拟方法研究了燃烧加热污染空气对氢燃料超燃冲压发动机性能的影响。以飞行马赫数Ma=6.5,当量油气比ER=0.6为计算基准状态,分别对纯净空气和污染空气来流下氢燃料超燃冲压发动机的整机流场和性能进行了对比计算分析。燃烧化学反应模拟采用了改进的H2/O2七组分八方程模型,湍流模型为标准的k-ε模型,并采用直连式燃烧室试验数据进行了数值方法的验证。研究结果表明:(1)相对于纯净空气来流,污染空气来流下的超燃冲压发动机推力和比冲均有所下降。(2)采用酒精燃烧加热器的前提下,来流参数匹配静温、静压、马赫数时,发动机性能与纯净空气来流下的结果最为接近,而匹配总温、总压、马赫数时相差最大。(3)来流参数匹配总焓、静压、马赫数的前提下,采用氢燃烧加热器时发动机性能与纯净空气来流下的结果最为接近,而采用甲烷燃烧加热器时相差最大。
Aiming at the problem of working fluid pollution in combustion heating ground test equipment, numerical simulation was used to study the influence of combustion heating air pollution on the performance of hydrogen fuel scramjet. Comparing the whole flow field and the performance of the hydrogen fuel scramjet with pure air and polluted air, the Mach number of flight Mach = 6.5 and the equivalent ratio of air to fuel ER = 0.6 are calculated. The modified H2 / O2 seven-component eight-equation model and the k-ε turbulence model were used to simulate the combustion chemical reaction. Numerical experiments were carried out using the direct combustion chamber test data. The results show that: (1) Compared with the pure air inflow, the thrust and specific impulse of the scramjet engine under the polluting air are decreased. (2) Under the premise of using alcohol burning heater, when the flow parameters match with static temperature, static pressure and Mach number, the engine performance is closest to the result of pure air flow, and the difference between total temperature and total pressure and Mach number is different maximum. (3) Under the premise of matching the total enthalpy, hydrostatic pressure and Mach number with the flow parameters, the performance of the engine with hydrogen combustion heater is closest to that of the pure air, while the difference is the largest when the methane combustion heater is used.