Abstract: Using primary variables and staggered, the 3-D turbulent flow field for an off-axis confined jet was computated by k-ε model of turbulent flow. Computing results on comparison with measurements are satisfactory. The computing results have provided much information on the flow pattern and given a basic understanding of the mechanism of stable combustion for pre-cornbustion chambers with an off-axis confined jet. A detail analysis shows that one of the major characteristics of the flow field is the large twis...