DOI QR코드

DOI QR Code

Experimental Study on Simplex Swirl Injector Dynamics with Varying Geometry

  • Received : 2010.11.04
  • Accepted : 2011.03.25
  • Published : 2011.03.30

Abstract

The effects of swirl chamber's diameter and length on injector's dynamic characteristics were investigated through an experimental study. A mechanical pulsator was installed in front of the manifold of a swirl injector which produces pressure oscillations in the feed line. Pressure in the manifold, liquid film thickness in the orifice and the pressure in the orifice were measured in order to understand the dynamic characteristic of the simplex swirl injector with varying geometry. A direct pressure measuring method (DPMM) was used to calculate the axial velocity of the propellant in the orifice and the mass flow rate through the orifice. These measured and calculated values were analyzed to observe the amplitude and phase differences between the input value in the manifold and the output values in the orifice. As a result, a phase-amplitude diagram was obtained which exhibits the injector's response to certain pressure fluctuation inputs. The mass flow rate was calculated by the DPMM and measured directly through the actual injection. The effect of mean manifold pressure change was insignificant with the frequency range of manifold pressure oscillation used in this experiment. Mass flow rate was measured with the variation of injector's geometries and amplitude of the mass flow rate was observed with geometry and pulsation frequency variation. It was confirmed that the swirl chamber diameter and length affect an injector's dynamic characteristics. Furthermore, the direction of geometry change for achieving dynamic stability in the injector was suggested.

Keywords

Swirl injector;Swirl chamber;Mechanical pulsator;Dynamic characteristics;Mass flow rate;Amplitude

References

  1. Bazarov, V. G. (1979). Liquid Injector Dynamics. Moscow, Russia: Mashonostroenie.
  2. Bazarov, V. G. (1995). Self-pulsations in coaxial injectors with central swirl liquid stage. 31st AIAA/ASME/ASE/ASEE Joint Propulsion Conference and Exhibit, San Diego, CA. AIAA Paper 1995-2358.
  3. Bazarov, V. G. (1996). Influence of propellant injector stationary and dynamic parameters on high frequency combustion stability. 32nd AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, Lake Buena Vista, FL.
  4. Bazarov, V. G. and Yang, V. (1998). Liquid-propellant rocket engine injector dynamics. Journal of Propulsion and Power, 14, 797-806. https://doi.org/10.2514/2.5343
  5. Borodin, V. A., Dityatin, Y. F., Klyachko, L. A., and Yagodkin, V. I. (1967). The Atomization of Liquids. Moscow, Russia: Mashonostroenie. p. 263.
  6. Khavkin, Y. (2004). The Theory and Practice of Swirl Atomizers. New York: Taylor & Francis. p. 100.
  7. Khil, T., Chung, Y., and Yoon, Y. (2010). Study on phaseamplitude characteristics in a simplex swirl injector with low frequency range. Journal of the Korean Society of Propulsion Engineers, 14, 19-28.
  8. Khil, T., Kim, S., Cho, S., and Yoon, Y. (2009). Quantification of the transient mass flow rate in a simplex swirl injector. Measurement Science and Technology, 20, 075405. https://doi.org/10.1088/0957-0233/20/7/075405
  9. Kulagin, L. W. and Moroshkin, M. I. (1966). Atomizers for Heavy Fuel Oil. Moscow, Russia: Mashonostroenie. p. 331.
  10. Rizk, N. K. and Lefebvre, A. H. (1985). Internal flow characteristics of simplex swirl atomizers. Journal of Propulsion and Power, 1, 193-199. https://doi.org/10.2514/3.22780
  11. Rubinsky, V. R. (1995). Combustion instabilities in the RD-0110 engine. Progress in Astronautics and Aeronautics, 169, 89-112.

Cited by

  1. Dynamic Characteristics of Open-Type Swirl Injector with Varying Geometry vol.32, pp.3, 2016, https://doi.org/10.2514/1.B35729
  2. Combustion Dynamics of Swirl Coaxial Injectors in Fuel-Rich Combustion vol.28, pp.6, 2012, https://doi.org/10.2514/1.B34448
  3. Analysis of Characteristics of Swirling Spray of the Ammonium Dinitramide (ADN)-Based Green Monopropellant pp.2093-2480, 2018, https://doi.org/10.1007/s42405-018-0085-4
  4. Relative Deviation of Mass Flow Rate in Swirl Injectors due to the Engineering Tolerances: Experimental Study vol.19, pp.3, 2018, https://doi.org/10.1007/s42405-018-0056-9