Wyniki wyszukiwania - BazTech

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A 2-Port, Space-Saving, Maintenance-Friendly Pneumatic Probe for Velocity Measurements

Olczyk A., Magiera R., Kabalyk K.

Metrology and Measurement Systems

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2018

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Vol. 25, nr 1

171--185

EN

This paper presents the concept, design and experimental results of tests, in laboratory conditions, of a 2-port, space-saving pneumatic probe. The main features of the probe are a result of restrictions imposed by the functioning environment: a limited space for probe installation, the possibility of processing only two output signals and requirements for simplicity and reliability of the probe. A cylindrical shape of the probe tip is proposed as a general concept, similar to the classic, cylindrical, 3-port probe. The main difference arises in using only two pressure signals: one from the overpressure zone on the front side of the cylinder and another, from the underpressure zone on the back side. After performing an appropriate calibration procedure, it is possible to measure the flow velocity and correct the pressure difference obtained by means of a velocity coefficient kv. This paper also presents an analysis of the kv coefficient uncertainty to evaluate the quality of measurements.

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Numerical modeling of the performance of a centrifugal compressor impeller with low inlet flow coefficient

Kabalyk K., Kryłłowicz W.

Transactions of the Institute of Fluid-Flow Machinery

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2016

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nr 131

97--109

EN

The paper presents the results of computational fluid dynamics modeling of the performance of two centrifugal impellers with low inlet flow coefficients. The first impeller with the flow coefficient of 0.024 had nine main and nine splitter blades and the outlet diameter of 447 mm. The second one differed from the first one only by the lack of the splitters, 18 main blades were used instead. The numerical simulations were verified by the experimental measurements performed on a corresponding test rig. The measurements show better performance characteristics of the impeller with splitters. The main aim of the numerical research, therefore, was to identify the reasons for the existing differences in the performance of the impellers.

3

The influence of the inlet duct design on the flow pressure fluctuations inside a sewage aeration-type centrifugal blower

Kabalyk K., Kryłłowicz W.

Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka

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2014

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nr 146

89--100

EN

Depending on customer requirements a waste water aeration blower might possess various inlet duct configurations. The design parameters that usually vary are the inlet duct volume or the geometry of the duct. However, it is not yet well known how can the duct design influence the steady and unsteady compressor operation. Due to that, this work aims to experimentally check how do such parameters as inlet duct volume, inlet filter and inlet guide vanes position affect the compressor stable and unstable performance. The measurements results show that the influence exists and has mainly quantitative rather than qualitative character.