关键词: 进气道;流场仿真;格网法;三维流;纳维尔－斯托克斯方程

Abstract: A practical engineering oriented algorithm based on multi grid technique is presented for computing full viscous internal flow in a S shaped inlet.The algorithm originates from Brandt′s multi grid theory and sloves 3 D Reynolds average N S equation with time marching implicit scheme of Beam Warming from fine grid levels through coarse ones in conjunction with“saw”shape iteration.The technique developed is employed to simulate the internal flow in a S shaped inlets and compared with experimental data.The comparative analysis demonstrates that the convergence results obtained by the algorithm is in agreement with general flow characteristics in S shaped duct,the secondary flow graphs captured are rational and clear and the total pressure recovery at exit cross section agrees with experimental data.Both convergence speed and computational accuracy are higher than ordinary single level′s.It is a reliable practical algorithm.

Key words: Inlet;Flow field simulation;Grids method;Three dimensional flow;Navier Stokes equation