摘要
干气密封流体膜与密封环间传热模型的合理选取对于准确求解密封温压分布和稳态性能至关重要。在CO_(2)近临界工况下,对比研究了密封环等温模型、绝热模型和共轭热传递模型对超临界CO_(2)干气密封端面温度、压力分布和开启力、泄漏率等稳态性能的影响,探讨了不同膜厚和转速条件下密封环等温模型和绝热模型的适用性,并基于共轭热传递模型研究了超临界CO_(2)和空气介质干气密封的温压分布和稳态性能差异。结果表明:以共轭热传递模型计算结果为基准,密封环等温模型假设适用于小膜厚低速流动工况,不过开启力偏低而泄漏率偏高,绝热模型假设适用于大膜厚高速流动工况;相较于空气介质干气密封,超临界CO_(2)干气密封在小膜厚下的温度分布和大膜厚下的压力分布基本接近,不过小膜厚下的温度更低,而在大膜厚下的压力更高。
The proper selection of heat transfer model between fluid film and sealing ring plays an important role in the accurate calculation of temperature and pressure distribution and steady state performance of dry gas seal.At close critical point of CO_(2),a comparative study on the heat transfer model,including isothermal model,adiabatic model and conjugate heat transfer model,on temperature-pressure distribution,opening force and leakage rate of supercritical CO_(2)dry gas seal was conducted.The applicability of the isothermal model and the adiabatic model under different rotating speed and film thickness was discussed.Moreover,the difference between supercritical CO_(2)and air dry gas seal on temperature-pressure distribution and steady-state performance were studied.The results show that compared with conjugate heat transfer model,the isothermal model assumption is suitable for the low speed flow with small film thickness,while the opening force is lower and the leakage rate is higher.However,the adiabatic model assumption is suitable for the high-speed flow with large film thickness.The temperature distribution of supercritical CO_(2)dry gas seal under the small film thickness is similar to that of the air dry gas seal,and the pressure distribution of them two at large film thickness is just the same.However,compared to the air dry gas seal,the temperature of supercritical CO_(2)dry gas seal at large film thickness is much lower,while the pressure of which at small film thickness is larger.
作者
江鹏
江锦波
彭旭东
孟祥铠
马艺
JIANG Peng;JIANG Jinbo;PENG Xudong;MENG Xiangkai;MA Yi(College of Mechanical Engineering,Zhejiang University of Technology,Hangzhou 310014,Zhejiang,China)
出处
《化工学报》
EI
CAS
CSCD
北大核心
2021年第8期4239-4254,F0002,共17页
CIESC Journal
基金
浙江省自然科学基金重大项目(LD21E050002)
国家自然科学基金项目(52075491,52076195,51975527)
浙江省基础公益研究计划项目(LGG21E050018)。
关键词
超临界CO_(2)
干气密封
传热模型
共轭热传递模型
温压分布
supercritical carbon dioxide
dry gas seal
heat transfer model
conjugate heat transfer model
temperature and pressure distribution
