Design and simulation verification of throttle orifice plate for large flow and high-pressure differential feedwater recirculation system
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摘要:目的 为了解决舰船蒸汽动力系统大流量高压差给水再循环管路因空化和汽蚀而导致的管路腐蚀及振动等问题，提出多级节流孔板设计方案。方法 根据多级节流孔板几何级数递减的设计规则，选取孔板级数、计算孔板孔径并校核孔板厚度。以某船给水再循环管路作为设计对象，开展实船严苛工况下的Mixture多相流模型数值仿真。结果 仿真结果表明：采用2片和1片节流孔板时，发生了不同程度的空化及汽蚀；采用3片节流孔板时，给水再循环管路基本不会发生空化和汽蚀现象。结论 该研究成果可为实船给水再循环管路中节流孔板后的管路汽蚀损坏问题整改提供参考。Abstract:Objectives In order to solve the problems of pipeline corrosion and vibration caused by cavitation in large flow and high-pressure differential feedwater recirculation pipelines of marine steam power system, a design scheme for multi-stage throttle orifice plates is proposed.Methods According to the design rule of the decreasing geometric series of multi-stage throttle orifice plates, the selection of orifice series, calculation of orifice diameter and verification of orifice thickness are carried out. Taking the feedwater recirculation pipeline of a ship as the design object, the numerical simulation of a Mixture multiphase flow model is carried out under the severe working conditions of a real ship.Results The simulation results show that when two or one throttle orifice plates are used, cavitation occurs to varying degrees in the feed water recirculation pipeline, but when three throttle orifice plates are used, cavitation will not occur.Conclusions The results of this study can provide references for the rectification of pipeline cavitation damage behind throttle orifice plates in the feedwater recirculation pipelines of real ships.
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图 3 1片节流孔板的饱和水体积分数分布
Figure 3. Volume fraction distribution of saturated water for one throttle orifice plate
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图 4 2片节流孔板的饱和水体积分数分布
Figure 4. Volume fraction distribution of saturated water for two throttle orifice plates
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图 5 3片节流孔板的饱和水体积分数分布
Figure 5. Volume fraction distribution of saturated water for three throttle orifice plates
表 1 节流孔板的设计数据
Table 1 Design data for throttle orifice plate
设计参数 孔板级数 第1级 第2级 第3级 设计压力$p$/MPa 10 10 10 内径$ {d_{\text{i}}} $/mm 90 90 90 许用应力$ {[\sigma ]^t} $/MPa 153 153 153 级前压力/MPa 8.61 3.76 1.34 级后压力/MPa 3.76 1.34 0.13 级压差$ \Delta P $/MPa 4.84 2.42 1.22 饱和压力$ {P_{\text{w}}} $/MPa 0.12 0.12 0.12 临界压力比系数$ {F_{\text{f}}} $ 0.94 0.94 0.94 阻塞压差$ \Delta {P_{\text{s}}} $/MPa 6.88 2.95 2.61 $ \Delta P $＜$ \Delta {P_{\text{s}}} $ 是 是 是 孔板孔径$ {D_{\text{k}}} $/mm 35 41 49 孔板厚度$ \delta $/mm 15 15 15 
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