Research and Development
Development of new methods in laser fluid flow measuring and fluid flow diagnosis
The department "Heat" has more than 17 years of experience in the area of laser measurements in flowing liquids. Laser-based measurement methods are applied to measure complex fluid dynamics and to validate computer simulations. Two different technologies are used in this department: the Laser Doppler Velocimetry, and the Particle Image Velocimetry. These tools allow velocity profiles and flow fields to be contactlessly measured. Special computer algorithms are used to analyze the measurement results; additionally, graphical representation tools simplify the interpretation of the data. In a near future, the measurement uncertainty for LDV-based flow measurements at higher temperatures (up to 250 °C) will be modelled, and subsequently validated at a new Flow test rig.
Fundamental research on fluid dynamics in pipings, among others, by means of numerical simulation
The department "Heat" has recently acquired competence in the area of simulation of complex fluid flow phenomena. Currently, numerical simulations are used to describe the physical processes in measuring devices under different inflow conditions of practical relevance with the objective of developing new methods for the testing of heat meters. In the future, it is planned to establish a rapid tool for fluid flow diagnosis that is based on numerical methods and laser measurement technique.
Analysis and characterization of the suitability of conventional measuring devices as transfer standard
Currently measuring devices are characterized in the framework of a european key comparison with the objective to transfer the scale "Volume" depending on the temperature of the heat transfer medium in the range of 3 °C – 80 °C in a flow rate range from 10 m³/h – 160 m³/h between the European national metrology institutes.
Development and analysis of methods fort he improvement of the measurement stability of heat meters
ecently, the department Heat developed testing methods in order to predict the measurement stability of heat meters. Further development of these methods and the integration of further influence quantities as for example the defined contamination of test water, are actual research objects.
Measuring signal processing and data analysis
Nowadays, measuring signal and data processing are done directly on a PC in the majority of cases. The electronic circuits and software systems that are required to access every type of measuring instrument without altering the measurement indication are developed at the department.
Tasks
The working group handles the R&D projects of the department. The main objectives of the research are works in the field of dissemination of the scale "thermal energy" (responsible: Dr. Lederer) and works to improve the measuring uncertainty and measuring stability of heat meters. A major part of the works is externally funded.
Contact
Head of Working Group
Dr. Thomas Lederer
Tel.: +49-30-3481-7230
E-Mail: 
Thomas.Lederer@ptb.de
Office
Stephanie Scheil
Tel.: +49-30-3481-7725
Fax: +49-30-3481-7386
E-Mail: Stephanie.Scheil@ptb.de
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