Mixing turbulent kinetic energy

Eigure 20 compares the predictions of the k-Q, RSM, and ASM models and experimental data for the growth of the layer width 5 and the variation of the maximum turbulent kinetic energy k and turbulent shear stress normalized with respect to the friction velocity jp for a curved mixing layer... 

As is shown below, in order to generate bias, the mixing time in (6.195) must depend on x. Assuming that the turbulent kinetic energy is quadratic in x,... 

The breakage and agglomeration kernels depend on mixing conditions. Optimizing the power input to the system which determines the turbulent kinetic energy it is possible to minimize breakage or agglomeration. 

The research presented opens a new area for flow control in combustion systems — mixing by active feedback control. Considered herein is a two-dimensional (2D) jet, and simple control strategies are proposed that, with small control effort, generate a large increase in turbulent kinetic energy of the jet flow. The control is applied by microjets or microflaps at the lip of the jet and requires only the meeisurement of pressure at the jet lip. It is demonstrated that the controller enhances mixing of massless particles, particles with mass, and a passive scalar. 

Several studies [23-25] have shown the effect of the combustor inlet conditions on the predicted flame structure, liner temperature, and emissions. These boundary conditions include the axial, tangential, and radial velocities the turbulent kinetic energy and associated length scale. To characterize the flow field at the exit of the TARS, two approaches were adopted. First, advanced diagnostic, such as LDV (discussed above), was used to measure the flow field distribution at the exit of the swirler. The data collected are used for inlet boundary conditions for the LES and database for numerical model validation. Second, a RANS model was used to study mixing and turbulence parameters in the TARS swirler [6]. 

Under further increase of V the change of mixing times values is not so significant. Thus, one can speak about critical value of liquid flows rate in tubular canal Vcr = 4 m/sec it is possible not to exceed it in real conditions. However, at the expense of increase of reaction mixture movement rate (apparatus productivity) turbulence kinetic energy density is increased (Fig. 3.20) and by this intensification of diffusion processes occurs. 

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