Unsteady flow behavior of a steam turbine control valve in the choked condition: Field measurement, detached eddy simulation and acoustic modal analysis
Unsteady flow behavior of a steam turbine control valve in the choked condition: Field measurement, detached eddy simulation and acoustic modal analysis
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DOI：
10.1016/j.applthermaleng.2017.02.087
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发表时间：
2017-05
影响因子：
6.4
通讯作者：
Peng Wang;Yingzheng Liu
中科院分区：
文献类型：
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作者：
Peng Wang;Yingzheng Liu
针对汽轮机预热过程中汽轮机调节阀在堵塞状态下的非定常流动行为，通过现场测量汽门主轴的振动行为、非定常流场的分离涡模拟(DES)和阀腔的声学模态分析，研究了汽轮机调节阀在堵塞状态下的非定常流动行为。根据振动行为的现场测量，确定了ST=0.044、ST=0.17和ST=0.59处的三个峰值频率。随后，从DES中确定了调节阀中的非定常流场，然后使用最先进的数据驱动的本征正交分解(POD)方法和互相关分析方法进行了分析，提取了与阀轴振动有关的主要非定常流动行为。结果表明，阀轴在ST=0.019处的侧向力波动是由于环状附壁射流的交替振荡造成的，这是由于前两个POD模式占据了湍流脉动能量的25%。阀门主轴在ST=0.043处的轴向力波动是由于环状附壁射流的同步振荡所致，这是由于第三、第四和第五振型占据了湍流脉动能量的15%。最后，通过对从DES结果中提取的压力波动进行比较的声学模态分析，发现在ST=0.174时气门腔内的轴向声模与气门主轴的轴向力波动有关，而在ST=0.61时气门扩散器的第一周向声模与气门主轴在ST=100.62处的侧向力波动有关。这证实了声学模式和压力波动模式之间的潜在耦合。这些互补技术被证明是研究阀门流致振动行为和强化声学的有效方法。
The unsteady flow behavior of a steam turbine control valve in the choked condition, which occurs during the warming-up process of a steam turbine, was studied through complementary techniques, including field measurements of the valve spindle’s vibration behavior, detached eddy simulation (DES) of the unsteady flow field, and acoustic modal analysis of the valve chamber. Three peak frequencies atSt= 0.044,St= 0.17, andSt= 0.59 were identified from field measurements of the vibration behavior. Subsequently, the unsteady flow fields in the control valve were determined from DES and then analyzed using the state-of-the-art data-driven proper orthogonal decomposition (POD) method and cross-correlation analysis, which extracted the dominant unsteady flow behavior in relation to the valve spindle’s vibrations. The findings demonstrated that the valve spindle’s lateral force fluctuations atSt= 0.019 occurred due to the alternating oscillations of the annular wall-attached jet, which resulted from the first two POD modes occupying 25% of the turbulent fluctuation energy. The valve spindle’s axial force fluctuations atSt= 0.043 were attributed to the synchronous oscillations of the annular wall-attached jet, which resulted from the third, fourth, and fifth POD modes occupying 15% of the turbulent fluctuation energy. Finally, through acoustic modal analysis that compared the pressure fluctuations extracted from the DES results, the axial acoustic mode in the valve’s cavity atSt= 0.19 was found to be associated with the valve spindle’s axial force fluctuations atSt= 0.174, while the first circumferential acoustic mode of the valve diffuser atSt= 0.61 was found to be associated with the valve spindle’s lateral force fluctuations atSt= 0.62. This confirmed the potential coupling between the acoustic mode pattern and pressure fluctuation pattern. These complementary techniques were demonstrated to be effective methodologies for the flow-induced vibration behavior and intensive acoustics in valves.