چكيده به لاتين
Cyclonic Separators are getting popular for their low weight, volume and pressure drop along with their few separating time and the ability to operate in high pressures (e.g. offshore wellheads). Two phase flow in a new axial cyclonic separator, equipped with involute inlet and outlet, designed by Caltec Co. (England) is simulated using CFD and evaluated using experimental data performed by the supervisor of this thesis.
An Eulerian-Eulerian approach is adopted for modeling two phase gas-liquid flow. k-ε Realizable model is used for simulating turbulence. Evaluation is performed for three gas volume fractions: 65%, 70% and 79%. Results show that a good agreement is present between CFD and experiments. For the above mentioned gas volume fractions, Overall effectiveness is reported 95.01, 99.5 and 99.51%. For investigating whether the problem is steady or unsteady, a comparison between these two methods is done, results show that with a good agreement, the steady solution can be used for simulations. By changing back pressure on two exits, effect of this parameter on separation efficiency is investigated. Approximately by increasing the heavy flow outlet back-pressure by 30%, we face a 3% increase in light phase outlet effectiveness. A study on the length of conversion parts is also done.
Using the CFD results and comparing them with experimental results, a new design of separator is presented. In the above mentioned design, the areas related to inlet, outlets, vortex finder and connection chamber geometry, are calculated according to minimum pressure loss.
