Theoretical study of dynamic characteristic of open-end liquid swirl injector
- Paper number
IAC-06-C4.P.3.09
- Author
Mr. Yang Lijun, Beijing University of Aeronautics and Astronautics, China
- Coauthor
Mr. Fu Qingfei, Beijing University of Aeronautics and Astronautics, China
- Year
2006
- Abstract
The purpose of this paper is to summarize important aspects of dynamic characteristic of open-end swirl injector which is used in liquid rocket engine. Customarily, propellant is injected into vortex chamber through one row of tangential passage which is located at the bottom of vortex chamber in swirl injector. In this paper, we also make an investigation on the dynamic of open-end swirl injector which has two rows of tangential passages used as filter. Theoretical analysis about the dynamic of open-end swirl injector has been done, regarding to the influence of axial velocity of liquid in vortex chamber on the mass flow rate pulsation. Moreover, the model of relative effect between tangential passage and vortex chamber has also been modified by taking account of the influence of reflected wave, and the formula for transfer function of the two types of swirl injector has been deduced. The dynamic of "filter" injector,open-end swirl injector and common swirl injector have been calculated respectively in order to make a comparison of their dynamic characteristic. The result shows that the flux fluctuation of open-end swirl injector is greatly less than common swirl injector, moreover, the phase characteristics of open-end swirl injector is more stable than that of common swirl injector with the increase of frequency. So we can come to the conclusion easily that open-end injector simultaneously acts as a sensitive element that may modify flow oscillations in addition to its main function of injecting propellant and preparing a combustible mixture. And open-end swirl injector with two rows of tangential passage can filter flow oscillation by adjusting the distance between the two rows of tangential passages to half of the oscillation wavelength.
- Abstract document
- Manuscript document
IAC-06-C4.P.3.09.pdf (🔒 authorized access only).
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