针对采用小孔滤网的驳船式核电汽轮机球形调节阀在大开度时通流损失较大的问题，设计了一种带大窗口的新型滤网。采用Fluent软件对原型阀、小孔滤网阀及大窗口滤网阀流场进行数值模拟，在压比分别为0.9和0.5时计算流量系数及总压损失系数随相对开度的变化值。搭建实验台对大窗口滤网阀的气动性能进行了实验验证。结果表明：压比不变情况下，相对开度从4.3%逐渐增大到43.5%的过程中，大窗口滤网阀在开度小于26.1%时流动特性与小孔滤网阀完全一致，阀内流动较为均匀，可有效降低振动噪声；当相对开度大于26.1%时，与小孔滤网阀相比，大窗口滤网阀流量系数增大，总压损失系数减小，通流性能更佳；大窗口滤网阀的实验值与计算值变化趋势基本一致，最大偏差不超过8%，验证了所采用的数值计算物理模型和计算方法的正确性。

Aimming at the problem that the ball control valve of a bargetype nuclear power turbine withsmall hole strainer had great throughflow loss at large valve opening, a new type of strainer with large window was designed.The aerodynamic performance of the prototype valve, the valve with small hole strainer and the valve with large window strainer was numerically simulated by using Fluent software. The changing values of the flow coefficient and the total pressure loss coefficient with the relative opening at the pressure ratios of 0.9 and 0.5 were calculated respectively. The experiment platform was constructed to verify the aerodynamic performance of the valve with large window strainer.The results show that when the pressure ratio remains unchanged, during the gradual increase process of relative opening from 4.3% to 43.5%, the flow characteristics of the valve with large window strainer at the opening of less than 26.1% keeps completely consistent with those of the valve with small hole strainer,the flow in the valve is more uniform, which can effectively reduce vibration and noise.At the relative opening of more than 26.1%, compared with the valve with small hole strainer, the flow coefficient of the valve with large window straineris increased, the total pressure loss coefficientis decreased, and the throughflow performance is better.The variation trend of the experimental value and the calculated value of the valve with large window strainer is basically consistent, and the maximum deviation is not more than 8%, which verifies the correctness of the adopted numerical calculation physical model and calculation method.

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