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1

The influence of water and mineral oil on volumetric losses in a hydraulic motor

100%
Sliwinski P.
Polish Maritime Research
|
2017
|
tom 24
|
nr Special Issue S1
In this paper volumetric losses in hydraulic motor supplied with water and mineral oil (two liquids having significantly different viscosity and lubricating properties) are described and compared. The experimental tests were conducted using an innovative hydraulic satellite motor, that is dedicated to work with different liquids, including water. The sources of leaks in this motor are also characterized and described. On this basis, a mathematical model of volumetric losses and model of effective rotational speed have been developed and presented. The results of calculation of volumetric losses according to the model are compared with the results of experiment. It was found that the difference is not more than 20%. Furthermore, it has been demonstrated that this model well describes in both the volumetric losses in the motor supplied with water and oil. Experimental studies have shown that the volumetric losses in the motor supplied with water are even three times greater than the volumetric losses in the motor supplied with oil. It has been shown, that in a small constant stream of water the speed of the motor is reduced even by half in comparison of speed of motor supplied with the same stream of oil
2

Influence of water and mineral oil on the leaks in satellite motor commutation unit clearances

100%
Sliwinski P.
Polish Maritime Research
|
2017
|
tom 24
|
nr 3
The article describes the flow rates of mineral oil and water flowing, as working media, through the commutation unit of a hydraulic satellite motor. It is demonstrated that geometrical dimensions of commutation unit clearances change as a function of the machine shaft rotation angle. Methods for measuring the rate of this flow and the pressure in the working chamber are presented. The results of pressure measurements in the working chamber during the transition from the filling cycle to the emptying cycle are included. The pressure in the motor’s working chamber changes linearly as a function of the shaft rotation angle, which has a significant effect on the leakage in the commutation unit clearances. The paper presents new mathematical formulas in the form: Q=f(Δpγ) to calculate the flow rate of water and mineral oil in the commutation unit clearances. The γ factor is described as a function of fluid viscosity and clearance length (the motor shaft rotation angle). The coefficients used in these formulas were determined based on the results of laboratory tests of a motor supplied with water and mineral oil.
3

The influence of water and mineral oil on mechanical losses in the displacement pump for offshore and marine applications

100%
Sliwinski P.
Polish Maritime Research
|
2018
|
tom 25
|
nr Special Issue S1
In this paper mechanical losses in a positive displacement pump supplied with water and mineral oil (two liquids having significantly different viscosity and lubricating properties) are described and compared. The experimental tests were conducted by using a prototype satellite pump of a special design. The design of the satellite pump is presented in the article. The pump features and a non-circular tooth working mechanism was developed to work with both water and mineral oil. The sources of mechanical losses in such pump are also characterized in this paper. On this basis, a mathematical model of the losses has been developed and presented. The results of the calculation of mechanical losses according to the model are compared with the results of the experiment. The experimental studies have shown that the mechanical losses in the water pump are even 2.8 times greater than those in the oil pump. It has been demonstrated that the mathematical model well describes the mechanical losses both in the water pump and the oil pump. It has been found that the results from the loaded pump simulation (at Δp=25MPa) differ from the results of the experiment by no more than 5% both for oil and water
4

Flow of liquid in flat gaps of the satellite motor working mechanism

100%
Sliwinski P.
Polish Maritime Research
|
2014
|
tom 21
|
nr 2
The article describes the methodology and results of investigations of the flow of oil and HFA-E emulsion in flat gaps of the working mechanism of a satellite motor. The flow of liquid in those gaps is turbulent and not fully developed. The article presents two methods of modelling this flow. Method I makes use of the Darcy-Weisbach formula, while Method II bases on the assumption that in the variable-length gaps the flow is turbulent in the area where the length is the smallest and laminar where the length is the largest. Consequently, the flow in such gaps can be modelled as the sum of laminar and turbulent flows. The results obtained in the experiment have made the basis for calculating relevant coefficients and assessing the proportion of turbulence in the flow modelled using both methods
5

The influence of water and mineral oil on mechanical losses in a hydraulic motor for offshore and marine applications

100%
Sliwinski P.
Polish Maritime Research
|
2020
|
tom 27
|
nr 2
6

The influence of water and mineral oil on volumetric losses in the displacement pump for offshore and marine applications

100%
Sliwinski P.
Polish Maritime Research
|
2019
|
tom 26
|
nr 2
In this paper, volumetric losses in a positive displacement pump supplied with water and mineral oil are described and compared. The experimental tests were conducted using a prototype of a satellite pump (with a non-circular tooth working mechanism). In this paper, the sources of volumetric losses in this pump are characterized. On this basis, a mathematical model of these losses has been presented. The results of the calculation of volumetric losses according to the model are compared with the results of the experiment. Experimental studies have shown that the volumetric losses in the water pump are even 3.2 times greater than the volumetric losses in the oil pump. It has been demonstrated that the mathematical model describing the volumetric losses both in the water pump and in the oil pump is quite good. It has been found that the results from the loaded pump simulation (at Δp=25MPa and ant n=1500rpm) differ from the results of the experiment by no more than 5% both for oil and water
7

Czy prywatyzowac gospodarke komunalna?

75%
Sliwinski P.
Przegląd Organizacji
|
2002
|
nr 07-08
36-38
8

Głuszce, urodzony by być wolne, cz.I

51%
Lagowska K., Bombik E., Rozewicz M., Sliwinski P.
Polskie Drobiarstwo
|
2015
|
nr 01
9

Głuszce, urodzone by być wolne, cz.II

51%
Lagowska K., Bombik E., Rozewicz M., Sliwinski P.
Polskie Drobiarstwo
|
2015
|
nr 02
10

Analiza polimorfizmu genów dla cytokin prozapalnych IL-1, IL-6 i TNF alfa u otyłych dorosłych z zespołem bezdechu sennego ( OBS)

33%
Demkow U., Popko K., Gorska E., Stoklosa A., Plywaczewski R., Sliwinski P., Gorecka D., Wasik M.
Diagnostyka Laboratoryjna
|
2007
|
tom 43
|
nr 3
11
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Content available

Matrix metalloproteinase 3 polymorphisms as a potential marker of enhanced susceptibility to lung cancer in chronic obstructive pulmonary disease subjects

33%
Brzoska K., Bartlomiejczyk T., Sochanowicz B., Cymerman M., Grudny J., Kolakowski J., Kapka-Skrzypczak L., Kruszewski M., Sliwinski P., Roszkowski-Sliz K.
Annals of Agricultural and Environmental Medicine
|
2014
|
tom 21
|
nr 3
12
Content available remote

Frequency of distribution of leptin receptor gene polymorphism in obstructive sleep apnea patients

33%
Popko K., Gorska E., Wasik M., Stoklosa A., Plywaczewski R., Winiarska M., Gorecka D., Sliwinski P., Demkow U.
Journal of Physiology and Pharmacology. Supplement
|
2007
|
tom 58
|
nr 5
13
Content available remote

Frequency of distribution of inflammatory cytokines IL-1, IL-6 and TNF-alpha gene polymorphism in patients with obstructive sleep apnea

27%
Popko K., Gorska E., Potapinska O., Wasik M., Stoklosa A., Plywaczewski R., Winiarska M., Gorecka D., Sliwinski P., Popko M., Szwed T., Demkow U.
Journal of Physiology and Pharmacology. Supplement
|
2008
|
tom 59
|
nr 6
607-614
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