高土石坝异型水舌雾化的数值反馈预测

Numerical feedback prediction on atomization of specially-shaped waterjet for high earth-rockfill dam

基于挑流雾化随机喷溅数值预测模型的深化认识和实践应用,阐述了高土石坝泄流雾化典型特征,优化了异型水舌和复杂地形的建模方法,并应用于去学水电站的雾化反馈预测。反馈结果显示:最大雨强2.55 mm/h的测点在数值预测的2.00 mm/h雨强包络线内,其余4个实测值小于2.00 mm/h的测点均在数值预测的2.00 mm/h雨强包络线外。预测结果表明:雨强为10.00 mm/h的雾化暴雨防护区,推荐防护范围纵向至计算域x坐标641.64 m,横向范围为计算域y坐标-136.98～295.00 m;风向SSE、风速13.70 m/s的自然风是加剧右岸雾化扩散的最不利风场,推荐自然小雨界值0.42 mm/h为村庄选址区控制雨强,迁址在计算域内x坐标795.60 m下游。研究成果可用于工程泄流雾化危害的科学防控,有助于丰富高土石坝泄流雾化安全防控理论与技术。

Based on the deepened understanding and practical application of the numerical prediction model for the random spraying atomization of jet flow from flip bucket, the typical characteristics of the discharge atomization for high earth-rockfill dam is expounded herein, and then the modeling methods for both the specially-shaped waterjet and complicated terrain are optimized, which are applied to the feedback prediction on the discharge atomization of Quxue Hydropower Station. The feedback result shows that the mearing point of the heaviest rainfall intensity is within the rainfall intensity envelope of the measured value of 2.55 mm/h, all the other four measuring points with the measured value less than 2.00 mm/h are located outside of the rainfall intensity envelope of the numerically measured value of 2.00 mm/h. The prediction result indicates that the recommended longitudinal range of atomized rainstorm protection zone with rain intensity value of 10.00 mm/h reaches to x coordinate of 641.64 m in the calculation domain, while the horizontal range is-136.98 m to 295.00 m of y coordinate in the calculation domain. Additionally, the natural wind with the wind direction of SSE wind and speed of 13.70 m/s is the most unfavorable wind field, and then the critical value of natural light rainfall of 0.42 mm/h is recommended to be the control intensity for the site selecting area for the village to be relocated, from which the relocated site for the village is determined in the downstream area of the x coordinate of 795.60 m in the calculation domain. The study result can be applied to the scientific prevention and control of the engineering hazard of discharge atomization and contribute enrich the theory and technology of the safety prevention and control of the discharge atomization for high earth-rockfill dam.