为探讨浅槽环瓣型浮动环密封的性能特点,首先分析了密封的结构和工作机理,采用FDM(F in ite D ifferenceMethod)、牛顿超松弛迭代求解Reynolds方程,获得密封间隙的流场压力分布及各种工况条件对泄漏量、静态刚度的影响。结果表明:轴向...为探讨浅槽环瓣型浮动环密封的性能特点,首先分析了密封的结构和工作机理,采用FDM(F in ite D ifferenceMethod)、牛顿超松弛迭代求解Reynolds方程,获得密封间隙的流场压力分布及各种工况条件对泄漏量、静态刚度的影响。结果表明:轴向浅槽的存在,产生了多楔形动压效应,使压力扰动不可能周向连续传播,提高了密封的稳态特性;轴颈线速度、密封腔压强、端面摩擦因数对于泄漏量、静态刚度具有很大影响,为特殊工况下径向密封件的设计和选用提供了参考。展开更多
Rotating experimental investigations were carried out to study the oil sealing capability of two different floating ring seals in cold/hot state for aero-engine. High-speed Floating Ring Seal(HFRS) is a seal with the ...Rotating experimental investigations were carried out to study the oil sealing capability of two different floating ring seals in cold/hot state for aero-engine. High-speed Floating Ring Seal(HFRS) is a seal with the inner diameter of 83.72 mm and maximum speed of 38000 r/min, and Low-speed Floating Ring Seal(LFRS) is another seal with the inner diameter of 40.01 mm and maximum speed of 18000 r/min. In hot state, sealing air with the temperature of 371 K and oil with the temperature of 343 K was employed to model the working conditions of an aero-engine. Comparisons between floating ring seal and labyrinth seal were done to inspect the leakage performance.More attention was paid to the critical pressure ratio where the oil leakage began. Results show that the critical pressure ratio in cold state is obviously larger than that in hot state for both seals. An underlying sealing mechanism for floating ring seal is clarified by the fluid film, which closely associates with the dimensionless parameter of clearance over rotating diameter(2 c/Dr). Another fantastic phenomenon is that the leakage coefficient in hot state, not the leakage magnitude, is unexpectedly larger than that in cold state. Overall, the leakage performance of the floating ring seal is better than the labyrinth seal.展开更多
按照我国载人航天登月需求,正在开展多次起动、10%~100%深度变推力80 k N液氧/甲烷发动机关键技术研究。氧涡轮泵作为发动机的核心组件,采用的浮动环密封变工况工作适应性将直接影响到涡轮泵工作的安全性和可靠性。依据发动机系统变推...按照我国载人航天登月需求,正在开展多次起动、10%~100%深度变推力80 k N液氧/甲烷发动机关键技术研究。氧涡轮泵作为发动机的核心组件,采用的浮动环密封变工况工作适应性将直接影响到涡轮泵工作的安全性和可靠性。依据发动机系统变推力要求,采用数值计算方法对浮动环密封进行不同推力工况、不同偏心率条件下的浮起力计算,并与一维方法计算的浮起阻力结果进行对比分析,确定全工况范围内一、二级浮动环工作时偏心率介于0.4~0.6之间,浮动环泄漏量约为2.58~39.4 g/s。浮动环在此偏心率范围内工作可靠性高,可以有效地避免浮动环碰磨、崩边,具备大范围变工况工作能力,满足涡轮泵安全性工作和发动机深度变推力工作要求,可以为涡轮泵方案论证及设计提供理论依据。展开更多
文摘为探讨浅槽环瓣型浮动环密封的性能特点,首先分析了密封的结构和工作机理,采用FDM(F in ite D ifferenceMethod)、牛顿超松弛迭代求解Reynolds方程,获得密封间隙的流场压力分布及各种工况条件对泄漏量、静态刚度的影响。结果表明:轴向浅槽的存在,产生了多楔形动压效应,使压力扰动不可能周向连续传播,提高了密封的稳态特性;轴颈线速度、密封腔压强、端面摩擦因数对于泄漏量、静态刚度具有很大影响,为特殊工况下径向密封件的设计和选用提供了参考。
基金supported by the National Natural Science Foundation of China (Nos. 51706223 and 51576193)
文摘Rotating experimental investigations were carried out to study the oil sealing capability of two different floating ring seals in cold/hot state for aero-engine. High-speed Floating Ring Seal(HFRS) is a seal with the inner diameter of 83.72 mm and maximum speed of 38000 r/min, and Low-speed Floating Ring Seal(LFRS) is another seal with the inner diameter of 40.01 mm and maximum speed of 18000 r/min. In hot state, sealing air with the temperature of 371 K and oil with the temperature of 343 K was employed to model the working conditions of an aero-engine. Comparisons between floating ring seal and labyrinth seal were done to inspect the leakage performance.More attention was paid to the critical pressure ratio where the oil leakage began. Results show that the critical pressure ratio in cold state is obviously larger than that in hot state for both seals. An underlying sealing mechanism for floating ring seal is clarified by the fluid film, which closely associates with the dimensionless parameter of clearance over rotating diameter(2 c/Dr). Another fantastic phenomenon is that the leakage coefficient in hot state, not the leakage magnitude, is unexpectedly larger than that in cold state. Overall, the leakage performance of the floating ring seal is better than the labyrinth seal.
文摘按照我国载人航天登月需求,正在开展多次起动、10%~100%深度变推力80 k N液氧/甲烷发动机关键技术研究。氧涡轮泵作为发动机的核心组件,采用的浮动环密封变工况工作适应性将直接影响到涡轮泵工作的安全性和可靠性。依据发动机系统变推力要求,采用数值计算方法对浮动环密封进行不同推力工况、不同偏心率条件下的浮起力计算,并与一维方法计算的浮起阻力结果进行对比分析,确定全工况范围内一、二级浮动环工作时偏心率介于0.4~0.6之间,浮动环泄漏量约为2.58~39.4 g/s。浮动环在此偏心率范围内工作可靠性高,可以有效地避免浮动环碰磨、崩边,具备大范围变工况工作能力,满足涡轮泵安全性工作和发动机深度变推力工作要求,可以为涡轮泵方案论证及设计提供理论依据。
