StreamLine Pro Anemometer System
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Applications • Single- or multi-point measurements of velocity and turbulence • Measurement of fluctuating temperatures • Gas and liquid flows • Transient and cyclic flow phenomena • 1-, 2- and 3-velocity components • Both freestream and near-wall measurements • Internal flows • High temperature environments • Boundary layer transition • Wall shear stress Features • High temporal resolution: Fluctuations up to 450 kHz can be measured • High spatial resolution: Eddies down to fractions of a mm can be resolved • High dynamic range: from a few cm/s to supersonic. • Real-time continuous output signal: Provides full information in the entire frequency range • Application software supports set-up, automatic calibration, data acquisition and data reduction • Turbulence statistics in both amplitude and frequency domain based on velocity time series Introduction Constant Temperature Anemometer (CTA) technology is a well-established measurement technique with commercial systems available since 1958. The measurement principle is based on the cooling of small sensors placed in the flow. The temperature (resistance) of the sensor is kept constant by an advanced feedback control loop that contains an electronic bridge circuit. This way, the anemometer produces a continuous voltage that is proportional to the instantaneous flow velocity. The output signal is sampled with high resolution so the flow velocity is determined accurately both in the amplitude domain and in the frequency domain. Even though CTA technique is intrusive and non-linear in response, it is still the best instrument for the accurate determination of high frequency flow fluctuations, boundary layer diagnostics, simultaneous multi-point velocity and temperature measurements. Description The StreamLine Pro system is the next generation CTA based on the popular StreamLine system. Using the latest developments in signal processing technology, the newly improved StreamLine Pro provides the highest Signal-to-Noise Ratio and widest bandwidths of any commercially available CTA system. In addition to the improved high-pass filters, we have also increased the accuracy of the gain and offset setting, which benefits the user by providing increased measurement accuracy and flexibility. For fundamental fluid dynamics and turbulence research, these significant improvements are critical to successful results especially in the most challenging measurement applications. The system is operated by the StreamWare Pro application software, which performs set-up, automatic probe calibration, acquisition of data, data conversion and data reduction.

StreamLine Pro Product Information The StreamLine Pro System components StreamLine Pro is an analog anemometer system with computerized set-up supported by a data acquisition and data analysis software package. The system combines the advantages of the classical high quality hot-wire anemometer, high accuracy converters and graphical user interface. The system comprises: • Frame with controller and temperature monitor • CTA anemometer modules • Optional Temperature module • Automatic probe calibrator • Hotwire and Fiber-film probes • Analog to digital converters • StreamWare Pro application...

StreamLine Pro During the directional calibration, the probe is yawed and rolled around two axes, while it is exposed to a constant calibration velocity. Measuring the probe response with the actual velocity on each sensor, StreamWare Pro software calculates the pitch and yaw factors. Individual velocity and directional calibrations improve the accuracy of the measurement compared to experiments using standard pitch & yaw factors. Product Information Multi-sensor probes for 2- and 3-component measurements In addition to the single yawed sensors, multiple sensor probes are also available in...

StreamLine Pro Product Information StreamLine Pro Product Information System Computer The StreamLine CTA system is delivered with a system computer, which is preconfigured, tested and ready to use. All necessary hardware and software installation is performed before delivery. The StreamLine Pro system computer is from an international manufacturer with worldwide presence. System Test All Dantec Dynamics systems with system controllers have to pass a detailed system test procedure before shipment where the test data is recorded on the system controller. The system test procedure ensures a...

Product Information It is also possible to design more advanced experiments with conditional sampling, waiting loops, exchange of data with other equipment etc. Turbulence Diagnostics in StreamWare CTA is still the preferred technique for investigation of turbulence due to its unmatched frquency response. In the frequency domain, power spectra can be computed for analysis of the fluctuating flow characteristics. The power spectrum calculation in StreamWare Pro provides a one-sided power spectral density per unit time. The computation combines features like block averaging, data windowing,...