Analysis of Rotor-Stator Interaction in Turbine Mode of a Pump-Turbine Model
Author(s):
Deyou Li , Ruzhi Gong , Hongjie Wang* , Xianzhu Wei , Z. S. Liu , D. Q. Qin
Abstract:
The highest-level fluctuations in large pump-turbines are usually originated from rotor-stator interaction (RSI) in the vaneless region. Hence, the studies of RSI phenomenon and corresponding unsteady effects are significantly important to reduce the pressure fluctuations. In this paper, firstly, RSI in a pump-turbine, featuring 20 stay vanes, 20 guide vanes and 9 runner blades, is analyzed through diameter mode theory, which has been used widely. Then, 3-D unsteady numerical simulations are performed under six guide vane openings in turbine mode. The comparison including performance and pressure characteristics between numerical and experimental results shows a good agreement. Finally, best guide vane opening 21° is chosen to analyze the distribution of pressure fluctuations. The detailed investigation of numerical results shows that frequencies in the vaneless region at best guide vane opening are mainly blade passing frequency (BPF) and its harmonic frequencies caused from RSI. The variation of BPF and its harmonic frequencies is confirmed by diameter mode theory. For this type of the pump-turbine, the amplitude of 2BPF (18fn) shows the highest corresponding diameter mode k2=-2, which indicates two high pressure regions caused by the component of 18fn in the vaneless region. Furthermore, the two high-pressure regions rotate in the counterclockwise direction with rotational speed of the runner blades. This research could provide a basic understanding of RSI to have a further study for pressure fluctuations in pump-turbines.
Keywords:
Language:
English
Published:
Journal Of Applied Fluid Mechanics, Volume:9 Issue: 5, Sep-Oct 2016
Pages:
2559 to 2568
magiran.com/p1573823
دانلود و مطالعه متن این مقاله با یکی از روشهای زیر امکان پذیر است:
اشتراک شخصی
با عضویت و پرداخت آنلاین حق اشتراک یکساله به مبلغ 1,390,000ريال میتوانید 70 عنوان مطلب دانلود کنید!
اشتراک سازمانی
به کتابخانه دانشگاه یا محل کار خود پیشنهاد کنید تا اشتراک سازمانی این پایگاه را برای دسترسی نامحدود همه کاربران به متن مطالب تهیه نمایند!
توجه!
- حق عضویت دریافتی صرف حمایت از نشریات عضو و نگهداری، تکمیل و توسعه مگیران میشود.
- پرداخت حق اشتراک و دانلود مقالات اجازه بازنشر آن در سایر رسانههای چاپی و دیجیتال را به کاربر نمیدهد.
دسترسی سراسری کاربران دانشگاه پیام نور!
اعضای هیئت علمی و دانشجویان دانشگاه پیام نور در سراسر کشور، در صورت ثبت نام با ایمیل دانشگاهی، تا پایان فروردین ماه 1403 به مقالات سایت دسترسی خواهند داشت!
In order to view content subscription is required
Personal subscription
Subscribe magiran.com for 70 € euros via PayPal and download 70 articles during a year.
Organization subscription
Please contact us to subscribe your university or library for unlimited access!