摘要
本文提出压缩冲程期间计算平顶活塞燃烧室流动特性摸拟的有限容积法。此法以著名的SIMPLE算法为基础。流场被视为轴对称结构。其间.利用通常的κ—ε模型,考虑到了湍流砭其耗散。本文旨在试验此法在不满足连续方程的初始条件下的稳定性和收敛速度。据表明,选用此法,以一个小的迭代数,可使其与压力场及速度场一起纳入运算,同时也注意到了在计算中的数值发散。
This paper presents a finite-volume method for flow characteristics simulation in a combustion chamber with a flat-topped piston during the compression stroke. The method is based on the well-known SIMPLE alRorithm. The flow field is treated as an axisymmetric one in which turbulence and its dissipation are taken into account by using an ordinary κ-εmodel. The object of this study is to test the stability of the algorithm and its convergence speed in the case of initial conditions which do not satisfy the continuity equation. It is shown that to choose the algorithm permits it to be brought in with the pressure field and with the velocities fields using a small iteration number. It is also noted that numerical diffusion takes place in calculations.
关键词
平顶活塞
轴对称结构
连续方程
flat-topped piston
finite-volume method
SIMPLE algorithm
axisymmetric field
continuity equation
numerical diffusion
