کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
708478 1461101 2014 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Accuracy analysis of a physical scale model using the example of an asymmetric orifice
ترجمه فارسی عنوان
تجزیه و تحلیل دقت یک مدل مقیاس فیزیکی با استفاده از نمونه ای از سوراخ نامتقارن
کلمات کلیدی
طرح، ابعاد مدل هیدرولیک ضریب افت محلی سر. دقت اندازه گیری، لرزش
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی کنترل و سیستم های مهندسی
چکیده انگلیسی


• Hydraulic scale model test (asymmetric orifice) used as a validation experiment.
• Theoretical error terms are added to the basic equations and evaluated.
• The accuracy for each type of instrument is checked.
• Further tests: vibration of the model, temporal offset and long term observation.
• Sensitivity analysis to study the influences of the uncertainties in the input data.

For a throttled surge tank of a high-head power plant in Austria the local head loss for an asymmetric orifice has to be quantified and optimized. The physical scale model tests (1:25) of nine different orifices are used as a validation experiment for 3D-numerical simulations (ANSYS-CFX). The increased requirements for the comparison of these two model assumptions lead to an extended accuracy analysis of the hydraulic model test. Based on Bernoulli׳s equation, theoretical error terms are added to the measured variables (differential pressure and discharge) and thus the measurement accuracy of different instrumentations was tested. The verification of the scale test is based on long-term observation. These tests include the measurement of the vibration of the scale model and an investigation of the temporal offset between the different types of measurement instruments. The results are also examined with the help of a sensitivity analysis.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Flow Measurement and Instrumentation - Volume 36, April 2014, Pages 36–46
نویسندگان
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