Sökning: "Nicholas Apazidis"

Hittade 5 avhandlingar innehållade orden Nicholas Apazidis.

  1. 1. On focusing of shock waves

    Författare :Veronica Eliasson; Nicholas Apazidis; John Dear; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; converging shock; Euler equations; imploding shock; Mach reflection; regular reflection; shock focusing; shock tube; Fluid mechanics; Strömningsmekanik;

    Sammanfattning : Both experimental and numerical investigations of converging shock waves have been performed. In the experiments, a shock tube was used to create and study converging shock waves of various geometrical shapes. Two methods were used to create polygonally shaped shocks. LÄS MER

  2. 2. On focusing of strong shock waves

    Författare :Veronica Eliasson; Nicholas Apazidis; Nils-Erik Molin; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; shock focusing; imploding shock; converging shock; reflected shock; annular shock tube; Fluid mechanics; Strömningsmekanik;

    Sammanfattning : Focusing of strong shock waves in a gas-filled thin test section with various forms of the reflector boundary is investigated. The test section is mounted at the end of the horizontal co-axial shock tube. Two different methods to produce shock waves of various forms are implemented. LÄS MER

  3. 3. Energy concentration by converging shock waves in gases

    Författare :Malte Kjellander; Nicholas Apazidis; Gabi Ben-Dor; KTH; []
    Nyckelord :;

    Sammanfattning : Converging shock waves have been studied experimentally in a shock tube, and numerically using inviscid calculations and the theory of geometrical shock dynamics. The converging shock waves were created in a shocktube with two modular test sections designed to create cylindrical respectively spherical waves. LÄS MER

  4. 4. On dynamics and thermal radiation of imploding shock waves

    Författare :Malte Kjellander; Nicholas Apazidis; Gabi Ben-Dor; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; converging shock waves; polygonal shock waves; temperature measurments; argon; plasma creation; ionisation; spectrometry; Engineering mechanics; Teknisk mekanik;

    Sammanfattning : Converging cylindrical shock waves have been studied experimentally. Numericalcalculations based on the Euler equations and analytical comparisons basedon the approximate theory of geometrical shock dynamics have been made tocomplement the study.Shock waves with circular or polygonal shock front shapes have been createdand focused in a shock tube. LÄS MER

  5. 5. Strong blast wave interaction with multiphase media

    Författare :Sembian Sundarapandian; Nicholas Apazidis; Konstantinos Kontis; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Blast waves; negative pressure; cavitation; blast wave attenuation; RMI; KHI; Teknisk mekanik; Engineering Mechanics;

    Sammanfattning : The interaction of a blast wave propagating in air with different fluids like water column, aqueous foam and thermal/density inhomogeneity have been studied both experimentally and numerically. The blast waves were generated at atmospheric conditions in a newly constructed exploding wire facility. LÄS MER