Cavitation erosion in liquid nitrogen

Dular, Matevž (avtor), Petkovšek, Martin (avtor)

Thermodynamic effects in cavitation become significant only when the critical-point temperature is close to the operating temperature of the fluid, as in the case of cryogenic fluids. Therefore, the understanding and the prediction of the cavitation effects in such cases is crucial in many applications - for example the turbopumps for liquid hydrogen (LH2) and oxygen (LOX) in space launcher engines. The new generation of rocket engines will also feature the possibility of re-ignition while in orbit and prolonged period of operation; hence cavitation erosion is becoming an issue at the design stage of the turbo-pumps. In the study, we show measurements of cavitation erosion in liquid nitrogen (LN2), where cavitation was generated by an ultrasonic transducer. The damage was evaluated on aluminium samples. Special care was given to accurate setting of the operation point - especially the operating pressure, which defines the size of cavitation. We show that it is less aggressive than cavitation in water and that its aggressiveness cannot be described by a single fluid property (for example the most commonly used Brennen's thermodynamic parameter Σ), but by a combination of several (viscosity, density, vapor pressure, surface tension, thermodynamic parameter) - in the present paper we addressed this point by a simple bubble dynamics model with consideration of the thermodynamic effect to qualitatively predict the results of the measurements. Finally, we also compared performance of several other engineering materials.

• Jezik: Angleški jezik
• Ključne besede: cavitation, erosion, liquid nitrogen, thermodynamic effect
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FS - Fakulteta za strojništvo
• Status publikacije: Objavljeno
• Različica publikacije: Recenzirani rokopis
• Leto izida: 2018
• Št. strani: Str. 111-118
• Številčenje: Vol. 400-401
• PID: 20.500.12556/RUL-126440
• UDK: 620.193.16(045)
• ISSN pri članku: 0043-1648
• DOI: 10.1016/j.wear.2018.01.003
• COBISS.SI-ID: 15832859

Avtorske pravice

Zapis Sherpa Romeo za revijo Wear https://v2.sherpa.ac.uk/id/publication/17170 : licenca za recenzirani rokopis (Accepted Version) je CC BY-NC-ND 4.0. (Datum opombe: 15. 3. 2023)

• Datum objave v RUL: 22.04.2021

Gradivo je del revije

• Naslov: Wear
• Skrajšan naslov: Wear
• Založnik: Elsevier
• ISSN: 0043-1648
• COBISS.SI-ID: 5374213

Licence

• Licenca: CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
• Opis: Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.
• Začetek licenciranja: 15.04.2018

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: kavitacija, erozija, tekoči dušik, termodinamični vpliv

Projekti

• Financer: Drugi - Drug financer ali več financerjev
• Program financ.: European Space Agency (ESA)
• Številka projekta: E4000111924/14/NL/NDeSTEC
• Naslov: Cavitation and cavitation erosion in cryogenic fluids