%0 Journal Article
%A Tanner, Franz X.
%A Reitz, Rolf D.
%D 2002
%I Begell House
%N 1-3
%P 187-208
%R 10.1615/AtomizSpr.v12.i123.100
%T THE SPRAY-INDUCED FLOW AND ITS EFFECT ON THE TURBULENT CHARACTERISTIC COMBUSTION TIME IN Dl DIESEL ENGINES
%U http://dl.begellhouse.com/journals/6a7c7e10642258cc,72486d435c9a81f9,04c3a1e93c7f2ad1.html
%V 12
%X In direct-injection diesel engines the combustion process is strongly influenced by the turbulence of the spray-induced flow. This flow is transient in nature and, therefore, the equilibrium-based k-e-type turbulence models yield inaccurate predictions of the turbulence mixing time scales. This requires adjustments of the turbulence characteristic combustion time by means of the coefficient *C*_{M}, in order to match experimental cylinder pressures of different engines. These adjustments are explained in terms of nonequilibrium turbulence behavior of the spray-induced flow. A relation between the spatially averaged equilibrium and nonequilibrium turbulence time scales is derived which leads to a scaling law between the different engines. In particular, the value of *C*_{M} for one engine can be obtained from the optimum *C*_{M} of another engine, provided the turbulence determining integral length scales are known. This scaling behavior has been demonstrated for four substantially different engines by comparing the tuned values of *C*_{M} with the computed scaling factors, and favorable agreement has been obtained.
%8 2002-06-01