Wyniki wyszukiwania - BazTech

Ograniczanie wyników

1 TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk
1 Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka

Powiadomienia systemowe

Sesja wygasła!

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: vortex pump

Sortuj według:

Ogranicz wyniki do:

A Mean-Line Flow Model of Viscous Liquids in a Vortex Pump

Li Wenguang

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

2022

Vol. 26, No 2

1--18

The axial, radial and tangential velocity profiles of six fluids were extracted from computational fluid dynamics simulation results at points in a pump chamber 1 mm distant from the blades in a vortex pump at the specific speed of 76. The critical radius was specified in the axial velocity radial profiles to determine the impeller inlet and outlet at six viscosities and part-load, design, and over-load points. A mean-line flow model and hydraulic loss model were built from the profiles. The incidence, incidence loss in the inlet, deviation angle, and slip factor in the outlet were calculated. The impeller theoretical head, pump hydraulic efficiency and volumetric efficiency were analyzed. It was shown that the axial, radial and tangential velocity profiles relate closely to the flow rate as usual, but also the viscosity, especially at low flow rates and in the inlet. The low flow rate and viscosity lead to near zero axial and radial velocities, a faster tangential velocity than the blade speed, negative incidence, and a small incidence loss coefficient in the inlet. The dimensionless critical radius ranged within 0.77–0.89 and reduces with the increasing flow rate and viscosity. The mean slip factor is between 0.11 and 0.20 and rises with the increasing flow rate and viscosity. The mean incidence loss coefficient is within 0.0020–0.15 and augments with the increasing flow rate but increases with the decreasing viscosity under part-load conditions. The theoretical head estimated by using the fluid tangential velocity between the outlet of the impeller and the inlet of the chamber is more reasonable.

Metody pomiaru lokalnych parametrów przepływu w kanałach pomp

Najdecki S.

Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka

2001

nr 119

61-68

Przedstawiono techniki badania parametrów lokalnych cieczy stosowane w Zespole Pomp Przepływowych IMP PŁ bazujące głównie na sondach ciśnienia różnych typów. Opisano budowę specjalnej dwuotworkowej sondy dla przepływów przestrzennych oraz jednootworkowej sondy do pomiarów w pobliżu ścianki. Możliwości danej techniki zilustrowano przykładowymi rezultatami badań.

Techniques of the local liquids parameters investigation used in Group of Turbopumps of Institute of Turbomachinery based on the different types of pressure probes are described. The construction and the way of measurement with special two-hole probe and the one-hole wall probe are presented. Examples of the results reached by discussed techniques are shown . All probes are calibrated in air-tunnel.