汽轮机调节阀设计的新思路

New Ideas for the Design of Steam Turbine Regulating Valves

在分析了现有汽轮机调节阀设计方法的基础上指出其不足,并提出了阀门设计的新思路。在新思路中引入数值计算的步骤,通过对调节阀流场的数值模拟,掌握阀门内部的细节流动信息。在此基础上找出流场不合理的问题所在,并通过适当措施改善和优化内部流场结构,以达到提高阀门气动性能的目的。然后对优化后的阀门进行模型试验,最终完成阀门设计。此外还研究了调节阀三维流场的计算方法,并根据新的阀门设计思路中所提出的以数值计算为依据来优化流场的思想,对一具体算例进行了数值计算,针对流场中所存在的问题,对阀门型线进行适当的调整,从而改善了气动性能。

On the basis of analyzing currently available design methods of steam turbine regulating valves,the shortcomings of these methods are pinpointed and a new approach for designing the regulating valves is proposed.The new design method includes a numerical computation step.Through a numerical simulation of the flow field of the regulating valves,detailed flow information inside the valves is identified.On this basis,all the irrational factors in the flow field can be detected and with the adoption of proper measures the internal flow field structure improved and optimized to attain the aim of enhancing the aerodynamic performance of the valves.Thereafter,a model experiment can be conducted of the optimized valve followed by a final completion of the valve design.In addition,a calculation method for the three-dimensional flow field of the regulating valves was studied.On the basis of the new approach that the flow field can be optimized based on the numerical calculation proposed in the new design method of valves,a numerical calculation was performed of a specific calculation example.In the light of the existing problems in the flow field,an appropriate adjustment has been undertaken of the valve profile,thus improving its aerodynamic performance.