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Study of Aerodynamics and Drag Reduce for the Base Bleed Projectile

Author: HuangHua
Tutor: ZhaoRunXiang
School: Nanjing University of Technology and Engineering
Course: Fluid Mechanics
Keywords: Bottom exhaust shells Numerical Simulation Aerodynamic Energy
CLC: TJ301
Type: Master's thesis
Year: 2009
Downloads: 108
Quote: 1
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Abstract


Remote repression of weapons and ammunition increasingly prominent role in modern warfare , extended range technology become an important research direction of modern artillery technology , in which the bottom of the exhaust Extended Range Technology has a higher rate of extended-range and widely used . The bottom of the exhaust bombs drag reduction extended range technology and its aerodynamic characteristics . This paper uses algebraic method to generate a flow field around the projectile three-dimensional computational grid , add artificial viscosity term MacCormack difference scheme for solving the three - dimensional Euler equations , numerical simulation of flow field in the bottomless row with bottom row case of projectile . Different Mach number and angle of attack flying projectile state aerodynamic coefficients calculated based on the resulting flow field parameters . The calculation results in line with the basic laws of aerodynamics . Many studies show that the gas mass flow rate of the bottom row Ⅰ often as empirical parameters cited in the end the Ministry of exhaust bombs , the bottom row of the The chemical combustion gases not only add quality effects , and also contains a high level of energy , the parameters will be the focus of the study on the quality of , and does not reflect the bottom row of the gas temperature factors . This paper will focus on the study the bottom of the exhaust bombs on the bottom row of the gas energy , speed and temperature of the bottom row of the border to join . Calculation results and analysis show that energy is an important factor of the bottom of the exhaust increasing projectile drag reduction of process , and the effect is higher than the pure quality of Tim , the higher the value of work , and can provide a reference for further study of the bottom of the exhaust increasing projectile drag reduction of Cheng .

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