Experimental research on optimizing the flow fieldof pulse gas flow generator

Ren Baoxiang; Tao Gang; Zhou Jie; Wang Jian; Wang Baogui

doi:10.11883/1001-1455(2016)01-0031-07

Volume 36 Issue 1

Oct. 2018

Turn off MathJax

Article Contents

Article Navigation > Explosion And Shock Waves > 2016 > 36(1): 31-37

Ren Baoxiang, Tao Gang, Zhou Jie, Wang Jian, Wang Baogui. Experimental research on optimizing the flow fieldof pulse gas flow generator[J]. Explosion And Shock Waves, 2016, 36(1): 31-37. doi: 10.11883/1001-1455(2016)01-0031-07

Citation:

Ren Baoxiang, Tao Gang, Zhou Jie, Wang Jian, Wang Baogui. Experimental research on optimizing the flow fieldof pulse gas flow generator[J]. Explosion And Shock Waves, 2016, 36(1): 31-37. doi: 10.11883/1001-1455(2016)01-0031-07

Citation:

PDF( 3312 KB)

Experimental research on optimizing the flow fieldof pulse gas flow generator

doi: 10.11883/1001-1455(2016)01-0031-07

1.
School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China
2.
Beijing Institute of Tracking and Communication Technology, Beijing 100094, China

Received Date: 2014-07-09
Rev Recd Date: 2015-01-04
Publish Date: 2016-01-25

Abstract

Abstract

In order to investigate the characteristics of pulse gas flow generator with different nozzle structures and analyze those of the flow field and their tendencies to change, we achieved the shock wave profiles generated by the gas flow generators and obtained experimental photos of flow field by using high-speed photography technology and controlling the light sources. Next, we studied the influence of different nozzles on air flow patterns using the polynomial fitting method to acquire the overpressure of shock wave, the attenuation rules of velocity corresponding with change of distance. Moreover, taking advantage of image processing technology, we collected effective data of the air flow from experimental images and, according to the first order exponential decay equation, we deduced the gas flow displacements and the variation rules of velocity corresponding with changes of time. Our results will help to better understand and use the relevant parameters of shock wave and gas flow and thus provide effective reference to optimized design for the equipment.
- fluid mechanics,
- vortex ring,
- image processing,
- pulse gas flow generator,
- shock wave

FullText(HTML)

References(17)

References

[1]	Lucey G, Jasper L. Vortex ring generator[R]. Adelphi, MD: Army Research Laboratory, 1998.
[2]	Shusser M, Gharib M. Energy and velocity of a forming vortex ring[J]. Physics of Fluids (1994-present), 2000, 12(3):618-621. doi: 10.1063/1.870268
[3]	Gharib M, Rambod E, Shariff K. A universal time scale for vortex ring formation[J]. Journal of Fluid Mechanics, 1998, 360:121-140. doi: 10.1017/S0022112097008410
[4]	Linden P F, Turner J S. The formation of optimal vortex rings, and the efficiency of propulsion devices[J]. Journal of Fluid Mechanics, 2001, 427:61-72. doi: 10.1017/S0022112000002263
[5]	Dabiri J O, Gharib M. Delay of vortex ring pinchoff by an imposed bulk counterflow[J]. Physics of Fluids (1994-present), 2004, 16(4):L28-L30. doi: 10.1063/1.1669353
[6]	Mohseni K, Ran H, Colonius T. Numerical experiments on vortex ring formation[J]. Journal of Fluid Mechanics, 2001, 430:267-282. doi: 10.1017/S0022112000003025
[7]	Saffman P G. Vortex dynamics[M]. Cambridge University Press, 1992.
[8]	Widnall S E, Bliss D B, Tsai C Y. The instability of short waves on a vortex ring[J]. Journal of Fluid Mechanics, 1974, 66(1):35-47. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=190dd6f8f7e7fdabd97b89579415e990
[9]	Widnall S E, Tsai C Y. The instability of the thin vortex ring of constant vorticity[J]. Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1977, 287(1344):273-305. doi: 10.1098/rsta.1977.0146
[10]	Fraenkel L E. Examples of steady vortex rings of small cross-section in an ideal fluid[J]. Journal of Fluid Mechanics, 1972, 51(1):119-135. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=S0022112072001107
[11]	Maxworthy T. Turbulent vortex rings[J]. Journal of Fluid Mechanics, 1974, 64(2):227-240. doi: 10.1017/S0022112074002370
[12]	Stanaway S K, Cantwell B J, Spalart P R. A numerical study of viscous vortex rings using a spectral method[R]. NASA STI/Recon Technical Report N, 1988. https://www.researchgate.net/publication/24295723_A_numerical_study_of_viscous_vortex_rings_using_a_spectral_method
[13]	Jassim E, Abdi M A, Muzychka Y. Computational fluid dynamics study for flow of natural gas through high-pressure supersonic nozzles: Part 1. Real gas effects and shockwave[J]. Petroleum Science and Technology, 2008, 26(15):1757-1772. doi: 10.1080/10916460701287847
[14]	Ryzhov O S. Shockwave formation in laval nozzles[J]. Journal of Applied Mathematics and Mechanics, 1963, 27(2):453-494. doi: 10.1016/0021-8928(63)90013-3
[15]	Brezhnev A L, Chernov I A. On the formation of shock waves in laval nozzles[J]. Journal of Applied Mathematics and Mechanics, 1981, 45(4):486-493. doi: 10.1016/0021-8928(81)90092-7
[16]	Akhmetov D G. Vortex rings[M]. Berlin: Springer, 2009.
[17]	Maxworthy T. Some experimental studies of vortex rings[J]. Journal of Fluid Mechanics, 1977, 81(3):465-495. doi: 10.1017/S0022112077002171