Numerical simulation on jet noise induced by complex flowsdischarging from small caliber muzzle
-
摘要: 为了研究小口径武器的膛口气动噪声特性，采用CFD-CAA耦合算法对7.62 mm枪的射流噪声场进行了数值模拟。由于膛口流场结构复杂，在目前的计算发展水平下还不足以采用CAA直接法，因而本文中采用混合方法，即首先采用CFD方法计算7.62 mm枪的膛口流场，然后利用所得结果，采用声学方程计算射流噪声，具体为膛口近场采用LES进行计算，远场声场采用FW-H声拟法计算。通过对比验证实验，验证了该计算方法的可行性。然后，对7.62 mm枪射流噪声进行了数值模拟，分析了噪声指向性，绘制了声压级云图。研究表明：在本文的计算条件下，射流噪声强度主要集中在近膛口区域；且射流最大噪声主要分布在与轴线方向成30°~60°范围内。Abstract: In order to investigate the characteristics of muzzle noise, a numerical study on jet noise induced by complex flows discharging from 7.62 mm gun is achieved. Because of the complex flows structure, it is not easy to study muzzle noise by direct simulation of CAA in current level of computational condition. CFD-CAA hybrid method is applied. At first, the muzzle flow is calculated by using LES. Using the obtained data, the jet noise is carried out by using FW-H equation. The feasibility of the numerical method is verified by comparing with the experiment. Then, the jet noise of 7.62 mm gun is numerically studied by using the hybrid method. Based on the numerical results, the jet noise directivity is analyzed and the contour of sound pressure level is also drawn. Results indicate that jet noise is mainly concentrated in the near muzzle region and the maximum jet noise mainly occurs in the range of 30°-60°.
-
[1] 曾永珠.枪械设计中的膛口噪声预测计算方法[J].弹道学报, 1995, 7(4): 92-96. http://www.cqvip.com/Main/Detail.aspx?id=1708117Zeng Yong-zhu. Prediction calculation method of muzzle noise in the firearms design[J]. Journal of Ballistics, 1995, 7(4): 92-96. http://www.cqvip.com/Main/Detail.aspx?id=1708117 [2] Bin J, Kim M, Lee S. A numerical study on the generation of impulsive noise by complex flows discharging from a muzzle[J]. International Journal for Numerical Methods In Engineering, 2008, 75(8): 964-991. [3] Lee I C, Lee D J, Ko S H, et al. Numerical analysis of a blast wave using CFD-CAA hybrid method[C]//12th AIAA/CEAS Aeroacoustics Conference(27th AIAA Aeroacoustics Conference). Cambridge, Massachusetts, 2006. [4] Rehman H, Hwang S H, Fajar B, et al. Analysis and attenuation of impulsive sound pressure in large caliber weapon during muzzle blast[J]. Journal of Mechanical Science and Technology, 2011, 25(10): 2601-2606. doi: 10.1007%2Fs12206-011-0731-2 [5] Liang S M, Tai C S. Analysis and prediction of shock-induced near-field acoustics from an exhaust pipe[J]. Computers & Fluids, 2011, 45(1): 222-232. https://www.sciencedirect.com/science/article/abs/pii/S0045793011000387 [6] Smagorinsky J. General circulation experiments with the primitive equations, I: The basic experiment[J]. Monthly Weather Review, 1963, 91(3): 99-164. https://www.scirp.org/reference/referencespapers.aspx?referenceid=710259 [7] Ffowcs Williams J E, Hawkings D L. Sound generation by turbulence and surfaces in arbitrary motion[J]. Royal Society of London, 1969, 264(3): 321-342. https://ui.adsabs.harvard.edu/abs/1969RSPTA.264..321F/abstract [8] Shur M, Spalart P R, Strelets M K. Noise prediction for increasingly complex jets, part Ⅰ: Methods and tests[J]. International Journal of Aeroacoustics, 2005, 4(3/4): 213-246. doi: 10.1260/1475472054771376 [9] Shur M, Spalart P R, Strelets M K. Noise predicion for increasingly complex jets, part Ⅱ: Applications[J]. International Journal of Aeroacoustics, 2005, 4(3/4): 247-266. doi: 10.1260/1475472054771385 [10] Sipatov A M, Usianin M V, Chuhlantseva N O. Applying Fluent Software for Jet noise Generation Modeling[C]//16th AIAA/CEAS Aeroacoustics Conference. Stockholm, Sweden, 2010. -
下载:
点击查看大图
图(8)
计量
- 文章访问数: 3107
- HTML全文浏览量: 374
- PDF下载量: 541
- 被引次数: 0