The stability characteristics of a premixed, swirl-stabilized flame were studied to determine the. effects of hydrogen addition on flame stability under fuel-lean conditions. The burner. configuration consisted of a centerbody with an annular, premixed methane/air jet.
eigenvalue - (mathematics) any number such that a given square matrix minus that number times the identity matrix has a zero determinant. characteristic root of a square matrix, eigenvalue of a matrix, eigenvalue of a square matrix. value - a numerical quantity measured or assigned or computed; the value assigned was 16 milliseconds.
So in other words, if I take the natural logarithm of e x, I get x back: in equation form ln(e x) = x, or equivalently, ln(exp(x)) = x. It works the other way around, too, exp(ln(x)) = x. The expression 1-exp(x) means raise the number e to the x power then subtract it from 1.