Use Of Euler Free Surface Flow Analysis To Provide Appropriate Injection Conditions In Euler-Lagrange Numerical Models

Abstract

The process of water injection at operating conditions of real gas turbines is an obscure two phase flow. This involves not only heat transfer and mass transfer but also the breakup and coalescence of droplets. To investigate such flows along with experiments, advanced CFD methods are also necessary. The Euler- Lagrange approach is one of the extensively used approaches for this process. However, providing a necessary boundary condition for this approach is quite challenging. In this paper, a Euler two phase free surface flow analysis in combination with a Linearized Instability Sheet Atomization (LISA) model is proposed to obtain the required injection conditions. This model considers the internal geometry of the nozzle and the air surrounding the outlet. The resulting free surface flow field is used to set the particle injection position and direction. Using these injection conditions a Euler-Lagrange analysis is set up. The Euler- Lagrange analysis results are analyzed and compared with the experimental data of water injection obtained from a hot air test rig.