凌津滩船闸输水廊道内动水压力及其脉动特性

对中水头单级短廓道输水船部－凌津滩船闸进行原型观测，资料分析表明：输水廓道工作阀门启门过程中，阀门下游廓道内动水压力的脉动普遍较大；阀门小开度时阀门门后及弯段内侧部位可出现瞬时负压，并于阀门门后廓道的上部出现很大的负压脉冲，负压脉冲持续时间不长，频谱分析未发现水流空化的迹象，动水压力的脉动属非空化流低频脉动性质。

Fluctuation Characteristics of Flow Pressure in Culvert Filling at Lingjintan Ship Lock

The Lingjintan ship lock is a single-lift and moderate head ship lock with a short culvert conveyance system. The analysis of the observational data in the prototype shows:the fluctuation of flow pressure in the downstream culvert of the lock paddle in the process of lock paddle opening for lock filling is generally large than that in the upsteam culvert ;at small opening there may be not only negative instantaneous pressure near the downstream side of the paddle and inside the curved section but also large negative pressure pulse in the upper part of the culvert near the downstream side of the paddle , but the duration of negative pressure pulse is not long.No signs of cavitation in the flow are found from the analysis of power spectral density . In lock filling the fluctuation of flow pressure is regarded as low frequency fluctuation of non-cavitation flow .