某型通气管升降装置的特点分析及改进建议

  目的  开展潜艇通气管进气阀结构优化，减小进气阻力，对潜艇的节能降耗和工作安全具有重要意义。  方法  采用计算流体动力学（CFD）方法对进气阀的阻力特性进行模拟分析，并通过实验验证计算结果的准确性。同时，对阀盘行程和进气角度这2项参数进行调节与分析，得到进气阀阻力及结构的相关规律。
  结果  结果显示：进气阀压力损失随阀盘行程的增大而逐渐减小，但在阀盘行程h>244 mm之后继续增大阀盘行程对降低压力损失的贡献不大；当进气角度θ>65°时，进气阀压力损失会急剧上升，而当进气角度θ < 65°时，角度变化对进气阀压力损失的影响不大。  结论  研究表明，阀盘行程和进气角度对进气阀阻力特性具有重要影响，通过结构优化，可显著降低进气阀的进气阻力，所得结果对工程设计具有一定的指导意义。

Characteristics analysis and improvement suggestions of a type of snorkel lifting device

  Objectives  It is important to optimize the structure of the air-intake valve for submarine snorkel and reduce air intake resistance, which is of great significance to submarine energy saving and working safety.  Methods  The CFD method is used to simulate the resistance characteristics of the air-intake valve, and the accuracy of the calculation results is verified by experiments. The two parameters flapper stroke and the intake angle are adjusted and analyzed, and the related rules between the air-intake valve resistance and the structure are obtained.  Results  The research results show that the pressure loss of the air-intake valve gradually decreases with the increase of the flapper stroke.
When the flapper stroke h is greater than 244 mm, continuing to increase the flapper stroke does not contribute much to the reduction of pressure loss. When the intake angle θ is greater than 65°, the air-intake valve pressure loss will rise sharply; when the intake angle is less than 65°, the angle change will have little effect on the pressure loss.  Conclusions  The research shows that the flapper stroke and the intake angle have important influence on the air-intake valve resistance characteristics. By structural optimization, the intake resistance of the air-intake valve is significantly reduced, and the results can be guidance for engineering design.