Research on Unsteady Characteristics of Underwater Supersonic Gas Jet

被引：0
|
作者：
Xu H.-Y. [1 ]
Luo K. [1 ]
Liu R.-C. [2 ]
机构：
[1] School of Marine Science and Technology, Northwestern Polytechnical University, Xi'an
[2] AECC Shenyang Engine Insititute, Shenyang
来源：
Tuijin Jishu/Journal of Propulsion Technology | 2019年 / 40卷 / 11期
关键词：
Back-attack and bulge; Multiphase flow; Pressure oscillation; Submerged gas jet; Underwater solid rocket motor;
D O I：
10.13675/j.cnki.tjjs.180649
中图分类号：
学科分类号：
摘要：
The floating rocket mine experiences a large change of environment pressure during operation. In order to simulate the working process of the underwater rocket engines, utilizing the VOF multiphase model, an axisymmetric model describing gas jet in different working states (under-expansion, full-expansion, over-expansion) of underwater engine was established. By simulating the working states with 0m/s and 50m/s, the evolution of the gas jet and unsteady flow characteristics under different working conditions were studied. With velocity 0m/s, the positon of neck shrinkage is far away from the nozzle, and the pulsation of mass flow rate and pressure is not obvious in under-expansion condition. In addition, under full-expansion and over-expansion conditionsmass flow rate and pressure is not obvious in under-expansion condition. In addition, under full-expansion and over-expansion conditions, the positon of neck shrinkage is closer to the nozzle. The maximum pressure amplitudes at nozzle outlet are 5.5MPa, 7MPa, respectively. Correspondingly, oscillation amplitude of mass flow rate is 5.2%, 32.8%. With upstream velocity 50m/s, the positon of neck shrinkage, bulge and back-attack is far away from the nozzle. The maximum pressure amplitude at nozzle outlet under full-expansion is 2MPa, and the pulsation of mass flow rate disappears. The maximum pressure amplitude at nozzle outlet under over-expansion condition is 6.1MPa, correspondingly, and the oscillation amplitude of mass flow rate is 30.4%. © 2019, Editorial Department of Journal of Propulsion Technology. All right reserved.
引用
收藏
页码：2618 / 2625
页数：7
相关论文
共 6 条
  • [1] Loth E., Faeth G.M., Structure of Plane Underexpanded Round Air Jets Submerged in Water, International Journal of Multiphase Flow, 15, 4, pp. 589-603, (1989)
  • [2] Shi H.H., Wang B.Y., Dai Z.Q., Research on the Mechanics of Underwater Supersonic Gas Jets, Science China Physics, Mechanics & Astronomy, 53, 3, pp. 527-535, (2010)
  • [3] Tan G.N., Wang N.F., Wei S., Flow Structure of Gaseous Jets Injected into Water for Underwater Propulsion, Acta Mechanica Sinica, 27, 4, pp. 461-472, (2011)
  • [4] Harby K., Chiva S., Oz-Cobo J.M., An Experimental Investigation on the Characteristics of Submerged Horizontal Gas Jets in Liquid Ambient, Experimental Thermal and Fluid Science, 53, pp. 26-29, (2014)
  • [5] Drew B.P., Entrainment Characteristics of Turbulent Round Gas Jets Submerged in Water, (2011)
  • [6] He M., Qin L., Liu Y., Oscillation Flow Induced by Underwater Supersonic Gas Jets from a Rectangular Laval Nozzle, Procedia Engineering, 99, pp. 1531-1542, (2015)
1