dr in Leszek Ksiazek Akademia Rolnicza w Krakowie

dr inż. Leszek Ksiazek Akademia Rolnicza w Krakowie, Katedra Inżynierii Wodnej Agricultural University of Krakow, Dept. of Water Engineering JET PUMPS introduction POMPY STRUMIENIOWE wstęp Seminarium dyplomowe 25 Listopad 2004, Kraków

Plan prezentacji: 1. Wstęp 2. Przykład pompy strumieniowej (jet pump) 3. Zasada działania pompy „Venturiego” 4. Przykłady zastosowania + film (6 min. )

1. What is a Jet Pump (pompa strumieniowa)? A JET PUMP is the same as an EJECTOR or (sometimes) an INJECTOR or an EDUCTOR. It is not the same as a VENTURI PUMP or an AIRMOVER. A jet pump is a pump (!) and is therefore, by definition, used to increase the pressure or the speed (or both) of a FLUID. You will notice there are no moving parts. A fluid may be either a GAS (like air) or a LIQUID (like water) or a changeable substance (like steam). In any pump ENERGY is put in and then taken out in a different form. For example, in a CENTRIFUGAL PUMP, or FAN, the energy is introduced through a rotating shaft.

What is a Jet Pump? In a jet pump, it goes in as a high speed jet of fluid, called the PRIMARY FLOW, or the MOTIVE FLOW. In both it is taken out mostly as increased pressure of a stream of fluid passing through. In a jet pump this stream is called the SECONDARY FLOW or the INDUCED FLOW and is said to be ENTRAINED by the primary flow. The primary flow and the secondary flow are discharged from the pump as a mixture called the COMBINED FLOW or the DELIVERED FLOW, or sometimes the TOTAL FLOW.

2. Typowa pompa strumieniowa – typical jet pump (1)

Jet – wysokociśnieniowy strumień cieczy

Typy pomp strumieniowych

3. Zwężka Venturiego 1 2 p. por. 1 2 Równanie Bernouliego dla cieczy idealnej dla przekrojów 1 -1 i 2 -2 (1)

Równanie Bernouliego dla cieczy idealnej dla przekrojów 1 -1 i 2 -2 (2)

Po podstawieniu do równania (2) (3) (4)

Analiza jakościowa (4) Równanie ciągłości strugi Q 1=Q 2; F 1 v 1=F 2 v 2 prędkość v 2 > v 1 dlatego v 22/2 g > v 12/2 g dla cieczy idealnej E 2 = E 1 z bilansu energi wynika p 2/ < p 1/

Przykład v 22/2 g > v 12/2 g p 2/ < p 1/ podciśnienie zasysanie z zewnątrz (powietrza, cieczy)

4. A Jet Pump in action

The AUS 016 is a jet pump, and so has no moving parts. It weighs only 22 kg/49 lb. Driven by medium pressure water, it can pump up to 20 tons/hour of solids of up to 38 mm/112'' size. It can deliver to more than 60 m height or 100 m distance. Branch sizes are 80 mm/3'' and 100 mm/4''. It is made of stainless steel, acetal and highchrome iron for long resistance to both wear and corrosoin.

The Seaton Pump is a lightweight (18 kg/37 lb) jet pump for deployment by diver, rov or other means. It will pass solids of up to 75 mm/3'' at up to 40 tons/hour. It is made of acetal or hardened steel and stainless steel, and is equiped with disintergration or dilution jets. Supply water is up to 7 bar/100 psi.

Jet Pump - pompa strumieniowa PRIMARY FLOW, or the MOTIVE FLOW (a high speed jet of fluid) – strumień wymuszający ruch cieczy the SECONDARY FLOW or the INDUCED FLOW – przepływająca mieszanina cieczy i zawiesiny, której ruch został wymuszony

Jet pump – pompa strumieniowa

Jet pump – pompa strumieniowa

A. W. Wakefield, 2002, An introduction to the jet pump, Stanford and GENFLOR Technology, Ed. V www. genflo. co. uk