The Progressive Spin Inlet - Homogeneous Flow Distributions Under Stringent Conditions

Abstract

<div class="htmlview paragraph">A new concept for achievement of homogeneous flow distributions in catalytic converters and particulate traps is presented. New applications such as NOx-adsorbers, SCR-catalysts and diesel particulate filters call for more homogeneous flow distributions. The new concept of the progressive spin inlet serves for homogeneous flow distribution within a short inlet cone. A spin is imposed on the flow at the outer radius of the catalyst inlet using helical-type flow elements. It is essential that the centre part of the flow is almost free of spin.</div> <div class="htmlview paragraph">Best results can be obtained when the spin elements are designed to impose a progressive spin. The combination of a progressive slope angle and a progressive height serves for a relative minimum in pressure drop.</div> <div class="htmlview paragraph">It is shown, that the progressive spin element also proves very good results with eccentric arrangements of the catalyst inlet cone. The parameters are optimised using CFD-calculations. The results agree well with velocity profile measurements and with flow visualisation in the catalyst inlet.</div>