沼蛤(Limnoperna fortunei)是贻贝科软体动物,可在管道造成生物污损和堵塞。沼蛤以浮游幼虫形态随水流入侵管道,其幼虫死亡率在高频脉动作用下明显提高。为寻找控制沼蛤入侵管道的有效途径,本研究选取3种孔板和3种筛网采用50 cm和25 cm两种间隔布置在试验管道中制造紊动,利用多普勒声学流速仪(ADV)测量其下游流场、紊动场和能谱特征等水力特性。结果发现致紊材料下游流速均出现短暂波动。大孔径孔板下游横向流速波动增强,加密布置可抑制此波动。筛网的阻水效应很小,加密布置可提高水流过筛流速。孔板下游紊动强度分布呈明显带状特征,筛网则不如孔板均匀,两者下游紊动强度均沿程降低。在下游5 cm距离内,孔板可大幅提高高频脉动能量,进而提升下游紊动强度,减小紊动长度尺度。筛网下游高频脉动能量提升幅度较小,同时低频脉动能量减弱。单级筛网比孔板消耗的水头小,加密布置并不增大单级致紊材料消耗的水头。综合来看,6 mm孔板、10 mm孔板和3 mm筛网具有较高管道湍流灭杀沼蛤幼虫的潜力。 Limnoperna fortunei is a mussel family mollusk that can cause biofouling and blockage in the pipeline. The frequency of larval mortality was significantly increased under the action of high frequency pulsation. In order to find an effective way to control the invaders, the three kinds of sieve plates and three kinds of sieves were selected to make turbulence in 50cm and 25cm intervals in the test pipelines. Using the Doppler acoustic velocity meter (ADV ) Measures the hydraulic characteristics of downstream flow field, turbulent field and energy spectrum. The results showed that the velocity of turbulence downstream material fluctuated briefly. Large-diameter orifice downstream of the lateral flow velocity fluctuations enhanced encryption arrangement can inhibit this fluctuation. Water blocking effect of the screen is very small, encrypted arrangement can increase the water flow through the sieve flow rate. The distribution of turbulence intensity at the downstream of the orifice plate shows obvious ribbon shape, while the mesh screen is not as uniform as the orifice plate, and the turbulence intensity at both downstream decreases along the process. In the distance of 5 cm downstream, the orifice plate can greatly improve the high frequency pulsation energy, thereby enhancing the downstream turbulence intensity and reducing the turbulence length scale. In the lower reaches of the screen, the energy increase of the dither is smaller and the energy of the low frequency pulsation is weakened. Single-stage screens consume less head than orifice plates, and the encrypted arrangement does not increase the head consumed by single-stage turbulence materials. Taken together, 6-mm, 10-mm and 3-mm screens have the potential for higher duct turbulence to kill Clarasia larvae.