کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7114045 1461081 2017 21 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Transient wall shear stress measurements and estimates at high Reynolds numbers
ترجمه فارسی عنوان
اندازه گیری های تنش برشی دیوار گذرا و برآورد شده در اعداد رینولدز بالا
کلمات کلیدی
استرس برشی دیوار، گذارنده ها، جریان لوله، روش فشار زمان،
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی کنترل و سیستم های مهندسی
چکیده انگلیسی
Transient wall shear stress measurements using hot-film anemometry have been performed in a large-scale laboratory setup at high Reynolds numbers. Starting from Reynolds numbers 1.7×106 and 0.7×106, the flow was brought to a complete rest by closing a knife gate thus replicating a pressure-time (also know as Gibson) flow rate measurement in a hydropower plant. Ensemble-averaged mean wall shear stresses obtained from 22 repeated runs have been compared with estimates obtained using the pressure-time method. The objective of the work has been to assess the accuracy of the frictional formulation entering the pressure-time integral. It is shown that both the standard method, a quasi-steady approach as well as the recently introduced unsteady method all reproduce the measured wall shear stresses quantitatively during most of the transient. The last phase, following the complete closure of the gate, which is characterized by a slow decay towards zero shear stress at the wall is, however, not captured by the available methods. In general, the unsteady formulation produces the smallest flow rate estimation error, which in turn, implies the best modeling of the frictional losses.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Flow Measurement and Instrumentation - Volume 58, December 2017, Pages 112-119
نویسندگان
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