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Measurement on Compressor Cascade KOBRA
Luxa, Martin; Šimurda, David
2022 - anglický
The report contains results and evaluation of conducted optical (shadowgraph and schlieren technique) and pneumatic measurements on the profile cascade intended for the tip section of the first rotor row compressor blade.
Klíčová slova:
compressor cascade; transonic flow; optical measurement; pneumatic measurement
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Measurement on Compressor Cascade KOBRA
The report contains results and evaluation of conducted optical (shadowgraph and schlieren technique) and pneumatic measurements on the profile cascade intended for the tip section of the first rotor ...
Current status of natural refrigerants for heat pumps in an electric bus
Aminian, Ali; Vinš, Václav
2022 - anglický
The technical report provides a survey on the current status of hydrocarbons, with special focus on propane (R290), used as natural refrigerants in air‐conditioning units and heat pumps. Due to the\nexpected phase‐down of halogenated refrigerants planned in the regulation of the European Parliament no. 2022/0099/COD, alternatives such as hydrocarbons, carbon dioxide or ammonia are\nmost probably to be used in EU in the near future. A review of recent developments of HVAC units for residential use and for electric vehicles operated with natural refrigerants is presented.
Klíčová slova:
heat pump; electric bus; refrigeration
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Current status of natural refrigerants for heat pumps in an electric bus
The technical report provides a survey on the current status of hydrocarbons, with special focus on propane (R290), used as natural refrigerants in air‐conditioning units and heat pumps. Due to ...
Measurements on KR-D-4 Cascade
Šimurda, David; Radnic, Tomáš
2021 - anglický
This report contains results and evaluation of aerodynamic measurements conducted on a subsonic compressor blade cascade.
Klíčová slova:
compressor blade cascade; experiment; subsonic flow; transonic flow; AVDR
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Measurements on KR-D-4 Cascade
This report contains results and evaluation of aerodynamic measurements conducted on a subsonic compressor blade cascade.
Measurements on TR-W-4 Cascade
Luxa, Martin; Šimurda, David
2021 - anglický
The report contains results and evaluation of conducted optical /interferometry and schlieren technique) and pneumatic measurements on the transonic profile cascade intenden for root section of rotor turbine blade.
Klíčová slova:
turbine cascade; transonic flow; hub section
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Measurements on TR-W-4 Cascade
The report contains results and evaluation of conducted optical /interferometry and schlieren technique) and pneumatic measurements on the transonic profile cascade intenden for root section of rotor ...
Flutter methodology using reduced order aeroelastic model
Prasad, Chandra Shekhar; Pešek, Luděk; Šnábl, Pavel
2021 - anglický
The present research project is focused on development of fast and efficient numerical method based on reduced order aeroelastic method (ROAM) for modeling and analysis of \nclassical flutter in the low pressure (LP) stage steam turbine blade. Stability diagram such as aerodynamic damping (AD) of aeroelasticity of cascade of 3D turbine blades used as a prime \ncharacterization factor. In the calculation of the S-curve/AD, the problem of classical flutter formation associated with running waves is considered here. Running waves is simulated by \nthe inter-blade phase shift of the blades in the cascade. Panel method based boundary element flow solver is employed for calculation of unsteady aerodynamic forces. This method is good \ncompromise of speed and accuracy for the estimation of the stability of the blades on a classical flutter. One way loose coupling technique between PM based flow solver and the structural \nmodel. For the structural part modal model synthesis (MMS) method is adopted in the ROAM solver. MMS is adopted to further reduced the computational cost. The ROAM simulated AD \nand pressure distribution over blade is compared high fidelity CFD data on real blade geometry provided by Doosan Skoda Power s.r.o. Furthermore, the ROAM results are also compared \nwith experimentally obtained results on two different linear cascade. The ROAM model shows good agreement with linear cascade results, however, there is noticeable discrepancy with real blade CFD results.
Klíčová slova:
reduced order model (ROM); classical flutter; steam turbine blade; panel method
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Flutter methodology using reduced order aeroelastic model
The present research project is focused on development of fast and efficient numerical method based on reduced order aeroelastic method (ROAM) for modeling and analysis of \nclassical ...
Measurements on TR-W-1 Cascade
Luxa, Martin; Šimurda, David
2020 - anglický
The research report contains experimetal data from optical and pneumatic measurements on transonic profile cascade with linear part of suction side downstream the sonic line, which is intended for the rotor wheal of a last stage of steam turbine
Klíčová slova:
transonic flow; steam turbine; profile cascade
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Measurements on TR-W-1 Cascade
The research report contains experimetal data from optical and pneumatic measurements on transonic profile cascade with linear part of suction side downstream the sonic line, which is intended for the ...
Measurements on TR-W-2 Cascade
Luxa, Martin; Šimurda, David
2020 - anglický
The research report contains experimetal data from optical and pneumatic measurements on transonic profile cascade with non-linear part of suction side downstream the sonic line, which is intended for the rotor wheal of a last stage of steam turbine.
Klíčová slova:
transonic flow; steam turbine; profile cascade
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Measurements on TR-W-2 Cascade
The research report contains experimetal data from optical and pneumatic measurements on transonic profile cascade with non-linear part of suction side downstream the sonic line, which is intended for ...
Measurements on KR-D-3 Blade Cascade
Šimurda, David; Hála, Jindřich; Radnic, Tomáš
2020 - anglický
This report contains result and evaluation of aerodynamic measurements conducted on a subsonic compressor blade cascade.
Klíčová slova:
compressor blade cascade; experiment; subsonic flow; transonic flow; AVDR
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Measurements on KR-D-3 Blade Cascade
This report contains result and evaluation of aerodynamic measurements conducted on a subsonic compressor blade cascade.
Optical and Pneumatic Measurement on TR-U-10 Cascade
Luxa, Martin; Šimurda, David
2020 - anglický
The report contains results and evaluation of conducted optical (interferometry and schlierren technique) and pneumatic measurements on the third variant of the new tip section, intended for long rotor blade.
Klíčová slova:
transonic flow; tip section; steam turbine
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Optical and Pneumatic Measurement on TR-U-10 Cascade
The report contains results and evaluation of conducted optical (interferometry and schlierren technique) and pneumatic measurements on the third variant of the new tip section, intended for long ...
Optical and Pneumatic Measurements on TR-U-9A Cascade
Luxa, Martin; Šimurda, David
2020 - anglický
The report contains results and evaluation of conducted optical (interferometry and schlieren technique) and pneumatic measurements on the eroded variant of the new tip section, intended for long rotor blade.
Klíčová slova:
transonic flow; experimental aerodynamic; steam turbine
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Optical and Pneumatic Measurements on TR-U-9A Cascade
The report contains results and evaluation of conducted optical (interferometry and schlieren technique) and pneumatic measurements on the eroded variant of the new tip section, intended for long ...
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