摘要：[目的]为评估计算流体力学(CFD)方法在预报水面飞行器高速水动力性能方面的可信度,指导飞行器水动布局设计,基于RANSE求解的方法对飞行器断阶构型单船身高速滑行绕流场开展数值研究。[方法]基于ITTC推荐规程和试验结果,对半滑行和高速滑行状态下船体阻力数值预报进行网格不确定度分析,采用通过验证与确认的数值模型对不同航速下断阶船滑行绕流场进行仿真,并对部分流场特性进行分析。[结果]结果表明,通过选择合适的y+值和网格尺寸捕捉流场特征,可提高预报精度;经过验证与确认的数值模型阻力、姿态预报结果与试验值吻合良好;在断阶船进入滑行状态后,断阶处形成的空腔起到增升减阻作用。[结论]研究结果可为水面飞行器高速滑行水动力预报和性能设计提供参考。

摘要：A method of measuring turbidity based on a multi-wavelength spectral sensor is proposed by using SFH4737 broad-band infrared LED,a multi-wavelength spectral sensor and independently developed data processing *** multiple wavelength data from the sensor,the unitary and multivariate fitting models were constructed to investigate the relationship among light intensity information,absorbance and turbidity,*** turbidity of the actual water bodies was measured separately by using proposed method and a commercially visible *** independent-samples T test(p>0.05)showed that there was no significant difference between the method in this paper and the standard assay *** method is simple and inexpensive,and can be applied to the rapid detection of water turbidity,providing a new way of industrial online measurement.

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