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1
Content available remote Przemysł z pamięcią kształtu
Siadkowska Ksenia
Stal, Metale & Nowe Technologie
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2023
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nr 7-8
16--19
PL
Stopy z pamięcią kształtu, zwane także materiałami inteligentnymi, zostały odkryte niecałe sto lat temu. Ich nietypowe zachowanie polega na powracaniu do ustalonego kształtu pod wpływem ciepła, oczywiście przy pewnych ograniczeniach wielkości odkształceń i zakresu temperatur.
2
Content available An assessment of the transient effect on helicopter main rotor stability and power demand
Raczyński Radosław, Siadkowska Ksenia, Ścisłowski Karol, Wendeker Mirosław
Combustion Engines
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2022
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R. 61, nr 4
23--28
EN
The researched object is a helicopter main rotor with blades of variable geometric twist characteristics. Variable torsion refers to systems of actuators made of shape memory alloys. The presented numerical analyses allow for evaluating both the dynamics of the rotor in transient states, i.e. in the zone between the static phase and the full activation phase and the impact of the change on the pulsation of the amplitude of the necessary power generated by the rotor corresponding the flight state, and thus covering the demand by the disposable power generated by the engine. This study follows a methodology of numerical analyses based on Multi Body Dynamics and the Finite Element Method and uses fluid mechanics elements and algorithms to analyze lift generation, compiled in a single computational environment referring to the same period of time.
3
Content available Strength analysis of a prototype composite helicopter rotor blade spar
Kliza Rafał, Ścisłowski Karol, Siadkowska Ksenia, Padyjasek Jacek, Wendeker Mirosław
Applied Computer Science
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2022
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Vol. 18, no 1
5--19
EN
This paper investigates the strenght of a conceptual main rotor blade dedicated to an unmanned helicopter. The blade is made of smart materials in order to optimize the efficiency of the aircraft by increasing its aerodynamic performance. This purpose was achieved by performing a series of strength calculations for the blade of a prototype main rotor used in an unmanned helicopter. The calculations were done with the Finite Element Method (FEM) and software like CAE (Computer-Aided Engineering) which uses advanced techniques of computer modeling of load in composite structures. Our analysis included CAD (Computer-Aided Design) modeling the rotor blade, importing the solid model into the CAE software, defining the simulation boundary conditions and performing strength calculations of the blade spar for selected materials used in aviation, i.e. fiberglass and carbon fiber laminate. This paper presents the results and analysis of the numerical calculations.
4
Content available Experimental Investigation on Indicated Pressure and Heat Release for Direct Hydrogen Injection in a Dual Fuel Diesel Engine
Siadkowska Ksenia, Barański Grzegorz, Sochaczewski Rafał, Wendeker Mirosław
Advances in Science and Technology. Research Journal
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2022
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Vol. 16, no 3
54--66
EN
This paper presents the research results for a diesel and hydrogen fueled engine. The research object is a four-cylinder, four-stroke ADCR engine with a displacement of 2,636 cm3. In the experiments, glow plugs were replaced with compressed hydrogen injectors and a special adapter. Hydrogen was supplied directly into a combustion chamber using a test injector. A hydrogen dose in the tests was changed at selected test points and ranged from 0 to 160 dm3/min. The research were conducted at 1,500 rpm. A hydrogen injection start angle and maximum hydrogen dose were specified from the preliminary experiments. The following parameters were analyzed: indicated mean effective pressure, maximum pressure, crank angle of maximum cylinder pressure occurrence and heat release. The obtained results were statistically analyzed. The conducted analysis focused on determining whether there are significant differences between early and late injection and how these changes affect the measured parameters.
5
Content available Analysis of propulsion units dedicated to test stands for aviation systems
Siadkowska Ksenia, Czajka Błażej, Ścisłowski Karol, Wendeker Mirosław
Combustion Engines
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2021
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R. 60, nr 2
39--43
EN
This paper presents an analysis of selected propulsion units dedicated to test stands for unmanned aircraft systems. It focuses on engines suitable for aircraft with a maximum take-off mass up to 150 kg. The study includes an analysis of propulsion units that can be used to power systems on stationary test stands dedicated to advanced research and measurement of prototype aerospace technologies intended for use in rotorcraft. The analysis of propulsion units shows that electric units are a better choice for powering UAV rotorcraft test stands. Their main advantages include the possibility to simplify the construction of the device by eliminating gears and to mount the motor in a vertical position, simpler power supply, cooling and control systems and the lack of an exhaust system. Additional advantages are undoubtedly lower vibration generation, cheaper and easier operation as well as better comfort.
6
Content available Wind Tunnel Research on the Unmanned Aerial Vehicle Rotor Blade Setting Angle
Siadkowska Ksenia
Advances in Science and Technology. Research Journal
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2020
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Vol. 14, no 4
104--114
EN
The recommended optimal twist angles were determined for particular sections of the prototype rotor blade dedicated to an unmanned helicopter. The main rotor blade was tested in the GUNT HM 170 tunnel for four different air flow velocities and variable angles of attack. The blade model was divided into sections, each of them was made in the 3D printing technology. For all the sections, the maximum lift and drag forces were determined and then converted to dimensionless values. The aerodynamic characteristics were calculated for each section and different air flow velocities in the wind tunnel. Due to the division of the blade into sections, it was possible to define the most favorable angles of attack along the rotor radius. Aerodynamic excellence was identified for each blade section and air flow velocities.
7
Content available Selecting a material for an aircraft diesel engine block
Siadkowska Ksenia, Czyż Zbigniew
Combustion Engines
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2019
|
R. 58, nr 3
4--8
EN
Selecting appropriate materials is presently a complex task as material databases cover tens of thousands of different types of materials. Product designing proceeds in numerous stages and in most of them there are open questions with not only one correct solution but better and worse ones. This paper overviews the Diesel engine body construction materials mentioned in the literature and discusses a certain practical method to select materials for a cylinder head and a Diesel engine block as a prototype. The engine body, depending on its purpose, is most frequently iron or aluminum. If it is important to optimize parts to achieve low weight, aluminum alloys are usually applied, especially in the automotive and aviation industries. In the latter case, weight is even more important so new types of magnesium alloys which are even lighter than aluminum ones are developed and used. However, magnesium alloys are, for example, more flammable and not enough strong so, for safety reasons, this type of material is not used solely in engine bodies.
8
Content available An investigation of the fuel injector dedicated to the aircraft opposed-piston two-stroke diesel engine
Siadkowska Ksenia, Wendeker Mirosław, Grabowski Łukasz
Combustion Engines
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2019
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R. 58, nr 2
151--155
EN
The paper presents the research results of the injector construction with the modified injection nozzle. The injector is designed for a prototype opposed-piston aircraft diesel engine. The measurements were based on the Mie scattering technique. The conditions of the experiment corresponded to maximum loads similar to those occurring at the start. The measuring point was selected in line with the analysis of engine operating conditions: combustion chamber pressure at the moment of fuel delivery (6 MPa) and fuel pressure in the injection rail (140 MPa). The analysis focused on the average spray range and distribution, taking into account the differences between holes in the nozzle. As a result of the conducted research, the fuel spray range was defined with the determined parameters of injection. The fuel spray ranges inside the constant volume chamber at specific injection pressures and in the chamber were examined, and the obtained results were used to verify and optimize the combustion process in the designed opposed-piston two-stroke engine.
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