Autor: Ostapski, W. - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Pulse powered turbine engine concept – numerical analysis of influence of different valve timing concepts on thermodynamic performance
Autorzy:: Tarnawski, P.
Ostapski, W.
Tematy:: pressure gain combustion
PGC
constant volume combustion
CVC
turbine engine
CFD analysis
valve timing
spalanie
silnik turbinowy
analiza CFD; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/200911.pdf Link otwiera się w nowym oknie
Opis:: The present work is an attempt to create the concept of an engine that will combine the benefits of a pulse powered piston engine and continuously powered turbine engine. The paper focuses on the subject of pressure gain combustion (PGC). A turbine engine concept with stationary constant volume combustors, working according the Humphrey cycle, is presented. Its work has to be controlled by valve timing system. Four different valve timing concepts were analyzed. Their influence on thermodynamic performance of engine was evaluated. Different valve constructions were researched by means of 3D numerical computational fluid dynamics (CFD) simulation.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The vibration of prototype aircraft propeller speed reduction unit – test bench and FEM numerical simulation study
Autorzy:: Ostapski, W.
Aromiński, A.
Dowkontt, S.
Tematy:: aircraft propeller
speed reduction unit
natural frequencies
FEM
bench test
jednostka samolotu
redukcja prędkości śmigła
częstotliwości naturalne
MES
metoda elementów skończonych
test drgań skrętnych; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/202223.pdf Link otwiera się w nowym oknie
Opis:: The results of torsional shaft vibration bench tests for a prototype aircraft propeller speed reduction unit are presented in this paper. The study was conducted as a function of engine speed and lubrication conditions. 3D model of the propeller speed reduction unit was developed. By using the finite element method, normal modes frequencies were defined. The simulation was conducted both unloaded and loaded under nominal power conditions.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: The influence of structural features on vibration of the propeller engine test bench
Autorzy:: Ostapski, W.
Aromiński, A.
Tułodziecki, M.
Tematy:: propeller engine test bench
propeller vibration
digital modelling
CAD
construction; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/280586.pdf Link otwiera się w nowym oknie
Opis:: The paper concerns the prototype of a propeller engine test bench stand designed for durability tests of airplane piston engines of 150-250 kW power range (Ostapski, 2011b, 2008). The technical data of the prototype engines to be tested on the bench have been adopted. It is obvious that at the beginning of the design process there is no information about the vibration spectrum of the propeller shaft, which is at the production process at that time. The basic 3D model of test bench constructional variants are presented in the article. Modes and frequencies of free vibrations are defined in ANSYS environment for both the loaded and unloaded structure and for various design variants. The estimated vibration frequency range for the propeller shaft varies from ƒ = 22 to ƒ = 360 Hz. In such a case, there is no easy way for rational test bench construction to be completely “untuned” to the vibration forcing load. This is the reason for introducing the basic model and few its modifications. After first engine tests, it should be possible to separate natural vibrations of the bench and high amplitude vibrations of the engine.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Oilless and frictionless compressor with double-sided rotationally oscillating piston
Autorzy:: Chomczyk, W.
Ostapski, W.
Piotrowski, J.
Tataj, T.
Tematy:: oilless and frictionless compressor
double-sided rotationally oscillating piston; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/202431.pdf Link otwiera się w nowym oknie
Opis:: The contents are concerned with a concept of an oilless and frictionless compressor operating without dead movement and having functional parameters superior to compressors of renowned manufacturers. The concept is based on patents No. 68220, 83060, P377851 by W. Chomczyk and patents P394072, P385733 by W. Chomczyk, W. Ostapski and J. Piotrowski. The proposed design of an oilless compressor ensures volumetric efficiency higher than that encountered in conventional compressors. It also generates pure compressed medium without necessity of filtering from oil particles, which is especially desired in food, pharmaceutical, medical, fragrance, chemical and automation industry.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Simulation and bench studies of the constructively and technologically modernized high performance piston aircraft engine. Stage I
Autorzy:: Ostapski, W.
Wierzchoń, T.
Rudnicki, J.
Dowkontt, S.
Tematy:: aircraft
piston
engine
plasma
nitriding
samolot
tłok
silnik
osocze
azotowanie; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/201721.pdf Link otwiera się w nowym oknie
Opis:: The paper presents an analysis of tribological wear of an assembly composed of cylinder liner and piston rings in a piston aircraft engine. In place of the previously used technology of gas nitriding of the cylinder liner (made out of 38CrAlMo6‒10 steel), formation of multi-component or composite layers by nitriding in plasma discharge environment was proposed. Also, a modification of the previously used chromium coating of the piston rings by plasma nitriding was proposed. A study on the structure and properties of surface layer diffusion manufactured by utilizing the phenomenon of cathode sputtering was carried out. Wear resistance tests were performed on a specially designed bench, with the use of isotope markers. Verification of each of the friction couples was based on using the wear of the ring as a function of the distance trip, and the roughness of the cylinder liner and ring.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Erratum to: Simulation and bench studies of the constructively and technologically modernized high performance piston aircraft engine. Stage I
Autorzy:: Ostapski, W.
Wierzchoń, T.
Rudnicki, J.
Dowkontt, S.
Tematy:: aircraft
piston
engine
plasma
nitriding
samolot
tłok
silnik
osocze
Azotowanie; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/201954.pdf Link otwiera się w nowym oknie
Opis:: In Ostapski et al., Bull. Pol. Ac.: Tech 65(1), 93-105 (2017), doi: 10.1515/bpasts-2017-0012, an analysis of tribological wear of an assembly composed of cylinder liner and piston rings in a piston aircraft engine was presented. In place of the previously used technology of gas nitriding of the cylinder liner (made out of 38CrAlMo6-10 steel), formation of multi-component or composite layers by nitriding in plasma discharge environment was proposed. Also, a modification of the previously used chromium coating of the piston rings by plasma nitriding was proposed. A study on the structure and properties of surface layer diffusion manufactured by utilizing the phenomenon of cathode sputtering was carried out. Wear resistance tests were performed on a specially designed bench, with the use of isotope markers. Verification of each of the friction couples was based on using the wear of the ring as a function of the distance trip, and the roughness of the cylinder liner and ring. This note corrects flaws in illustrations published in the original paper.
Dostawca treści:: Biblioteka Nauki

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