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为了获得适用于工程估算的射流穿透经验关系式,对射流中心迹线、穿透边界及喷注物展向分布特性进行模化处理,建立了描述超声速气流中横向气体射流混合经验模型,并通过系列实验观测结果对该模型有效性进行验证.结果表明:在较宽的动量比范围内(动量比为0.5~5.3),该模型预测的射流中心迹线和穿透边界均与实验图像吻合较好,在射流中心迹线附近,该模型预测的喷注物摩尔分数与实验测量值相比误差在5%以内,精度优于现有模型.随着动量比的增大,在喷孔下游一定区域内,射流引起的反转旋涡对增强,导致该模型对展向摩尔分数分布的预估产生一定误差,表明该模型的适用范围与动量比和下游距离等因素相关.
In order to get the empirical relationship of jet penetration, which is suitable for engineering estimation, the jet center trace, the penetration boundary and the distribution characteristics of jets are modeled. The empirical model describing the mixing of transverse gas jets in supersonic airflow is established. The validity of this model is validated by a series of experimental observations.The results show that the predicted jet centerline and penetration boundary of the model agree well with the experimental images over a wide range of momentum ratios (momentum ratio of 0.5-5.3) Preferably, the error of the predicted mole fraction of the injected material in the vicinity of the jet center trace is within 5% of the experimental measurement value, and the accuracy is better than the existing model. As the momentum ratio increases, In a certain area, jet-induced vortex reversal is enhanced, resulting in a certain error in the model’s prediction of the distribution of the mole fraction, indicating that the applicable range of the model is related to factors such as momentum ratio and downstream distance.