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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 한국항공우주학회 International Journal of Aeronautical and Space Sciences International Journal of Aeronautical and Space Sciences Volume.16 Number.2
- 발행연도
- 2015.6
- 수록면
- 123 - 136 (14page)
이용수
초록· 키워드
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The present study numerically investigates the effect of shield on the flow characteristics of Hartmann whistle. The flow characteristics of un-shielded Hartmann whistle are compared with whistles of different shield heights 15 mm, 17 mm, 20 mm, 25 mm and 30 mm. The comparison of Mach number contours and transient velocity vectors of shielded Hartmann whistles with un-shielded ones for the same conditions reveal that the presence of shield causes the exiting jet to stick to the wall of the shield without causing spill-over around the cavity inlet, thus sustaining the shock oscillation as seen in the unshielded Hartmann whistle, which has intense flow/shock oscillation and spill-over around the cavity mouth. The velocity vectors indicate jet regurgitance in shielded whistles showing inflow and outflow phases like un-shielded ones with different regurgitant phases. The sinusoidal variation of mass flow rate at the cavity inlet in un-shielded Hartmann whistle indicates jet regurgitance as the primary operating mode with large flow diversion around the cavity mouth whereas the non-sinusoidal behavior in shielded ones represent that the jet regurgitance is not the dominant operating mode. Thus, this paper sufficiently demonstrates the effect of shield in modifying the flow/shock oscillations in the vicinity of the cavity mouth.
목차
Abstract
1. Introduction
2. Numerical methodology
3. Results and discussion
4. Conclusions
References
참고문헌 (15)
참고문헌 신청
[학술지(정기간행물)] - Hartmann, J. / 1919 / Om en ny methode til frembringelse af lydsvinginger / DanMat Fys Medd 1 : 13 ~
[학술지(정기간행물)] - K.S. Chang / 1996 / A study on the Hartmann Sprenger tube flow driven by a sonic jet / International Journal of Turbo and Jet Engines 13 : 173 ~ 182
[학술지(정기간행물)] - S.M .Chang / 2001 / On the jet regurgitant mode of a resonant tube / Journal of Sound and Vibration 246 (4) : 567 ~ 581
[학술대회논문] - A. Hamed / 2003 / Characterization of powered resonance tube for high frequency excitation / Proceedings of FEDSM’03 4TH ASME– JSME Joint Fluids Engineering Conference Honolulu
[학술지(정기간행물)] - E. Brun / 1957 / Research on the acoustic air-jet generator: a new development / Journal of the Acoustical Society of America 29 (5) : 573 ~ 583
[학술지(정기간행물)] - K.S. Chang / 1996 / A study on the Hartmann Sprenger tube flow driven by a sonic jet / International Journal of Turbo and Jet Engines 13 : 173 ~ 182
[학술지(정기간행물)] - S.M .Chang / 2001 / On the jet regurgitant mode of a resonant tube / Journal of Sound and Vibration 246 (4) : 567 ~ 581
[학술대회논문] - A. Hamed / 2003 / Characterization of powered resonance tube for high frequency excitation / Proceedings of FEDSM’03 4TH ASME– JSME Joint Fluids Engineering Conference Honolulu
[학술지(정기간행물)] - E. Brun / 1957 / Research on the acoustic air-jet generator: a new development / Journal of the Acoustical Society of America 29 (5) : 573 ~ 583
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UCI(KEPA) : I410-ECN-0101-2016-558-001647421