Study on self-pulsation characteristics of gas centered shear coaxial injector for supercavitating underwater propulsion system
0
조회
0
다운로드
1
인용
0
참고문헌
키워드
초록
In order to design a shear coaxial injector of solid particles for underwater propulsion system, basic experiments on gas-liquid shear coaxial injector are necessary. In the gas-liquid coaxial injector self-pulsation usually occurs with an intense scream. When self-pulsation occurs, mass flow rate oscillation and intense scream are detected by the interactions between the liquid and gas phase. Self-pulsation must be suppressed since this oscillation may cause combustion instabilities. Considerable research has been conducted on self-pulsation characteristics, but these researches are conducted in swirl coaxial injector. The main objective of this research is to understand the characteristics of self-pulsation in shear coaxial injector and reveal the mechanism of the phenomenon. Toward this object, self-pulsation frequency and spray patterns are measured by laser diagnostics and indirect photography. The self-pulsation characteristics of shear coaxial injector are studied with various injection conditions, such as the pressure drop of liquid and gas phase, and recess ratio. It was found that the frequency of the self-pulsation is proportional to the liquid and gas Reynolds number, and proportional to the L/d.
Abstract
In order to design a shear coaxial injector of solid particles for underwater propulsion system, basic experiments on gas-liquid shear coaxial injector are necessary. In the gas-liquid coaxial injector self-pulsation usually occurs with an intense scream. When self-pulsation occurs, mass flow rate oscillation and intense scream are detected by the interactions between the liquid and gas phase. Self-pulsation must be suppressed since this oscillation may cause combustion instabilities. Considerable research has been conducted on self-pulsation characteristics, but these researches are conducted in swirl coaxial injector. The main objective of this research is to understand the characteristics of self-pulsation in shear coaxial injector and reveal the mechanism of the phenomenon. Toward this object, self-pulsation frequency and spray patterns are measured by laser diagnostics and indirect photography. The self-pulsation characteristics of shear coaxial injector are studied with various injection conditions, such as the pressure drop of liquid and gas phase, and recess ratio. It was found that the frequency of the self-pulsation is proportional to the liquid and gas Reynolds number, and proportional to the L/d.
참고문헌 (15)
- Foot, J.P, "Investigation of aluminum particle combustion for underwater propulstion applications", AIAA Journal, pp.1996~3086 (1996)
- Bayvel, L, "Liquid Atomization" (1993), Taylor and Francis
- Camatte, P, "Modelisation of pulverisation systems: some aspects of linear stability analysis, In Instabilities in multiphase flows" (1993), Plenum Press
- Lee, J.G, "Linear stability analysis of gasliquid interface", AIAA Journal, 29, pp.1589~1595 (1991)
- Lefevbre, A.W., "Atomization and Sprays" (1989), Hemisphere Publishing Corp
- Bazarov, V.G, "Self-pulsation of liquid flow in coaxial air stream, In Soviet Aeronautics, vol. 3", pp.14~18 (1978), Pergamon
- Bazarov, V.G., "Self-pulsation in coaxial injectors with central swirl liquid stage", 31st AIAA, SAE, pp.ASEE Joint Propulsion Conference and Exhibit, 1995
- Bazarov, V.G, "Liquid-propellant rocket engine injector dynamics", J. Propul. Power, 14, pp.797~806 (1998)
- Zhou, J, "Flow rate and acoustic characteristics of coaxial swirling injector of hydrogen", oxygen rocket engine, ASME, pp.SAE, ASEE Joint Propulsion Conference and Exhibit[DOI]
- Kendall, J.M, "Experiments on annular liquid jet instability and on the formation of liquid shells", Phys. Fluids, 29(7), pp.2086~2094 (1986)
- Carvalho, I.S, "Liquid film break-up in a model of a prefilming airblast nozzle", Exp Fluids, 24, pp.408~415 (1998)
- Wahono, S, "Highspeed visualization of primary break-up of annular liquid sheets", Exp Fluids, 44, pp.451~459 (2008)
- Mayer, W, "Propellant injection in a liquid oxygen", gaseous hydrogen rocket engine, 1996, pp.12, 1137~1147
- Rehab, H, "Flow regimes of large-velocity ratio coaxial jets", J. Fluid Mech, 345, pp.357~381 (1997)
- Im, J.H, "Self-pulsation characteristics of a gas-liquid swirl coaxial injector", Atomization and Sprays, 19(1), pp.57~74 (2009)