DIFFERENCE-QUOTIENT TURBULENCE MODEL - THE AXISYMMETRICAL ISOTHERMAL JET

Taking the difference-quotient turbulence model into consideration, th e mean velocities and the second-order fluctuation correlations, also called Reynolds stresses, of the axisymmetric isothermal jet in a quie scent surrounding are analytically calculated. Tn-ee propositions are stated and proved. They relate a normalized turbulence fluctuation int ensity and two turbulent energies on the cel!ter line of the jet to it s spreading angle. The experiments confirm all propositions and severa l other model results convincingly.