Simulations of Two-dimensional High Speed Turbulent Compressible Flow in a Diffuser and a Nozzle Blade Cascade

Abstract

This research describes the development of a new structured 2D CFD solver for compressible flow. The high-speed turbulent flow in a diffuser and a cascade of nozzle blade is predicted using standard k-ε turbulence model. The new finite volume CFD solver employs secondorder accurate central differencing scheme for spatial discretization and multi-stage Runge-Kutta time integration to solve the set of nonlinear governing equations with variables stored at the vertices. Artificial dissipations with pressure sensors are introduced to control solution stability and capture shock discontinuity. In general, the predictions compare well with the experimental measurements.

Experimental and Numerical Study of Pressure Ratio Distributions For Transonic Condensing Flow Through a Stationary Stator Blades Cascade

“…Figures (11)(12) show the variation in liquid mass generation rate in the computational domain. Low back pressure cause high liquid mass generation rate for all ranges of inlet superheat conditions.…”

“…A number of numerical studies were directed toward modeling two phase flow behavior of nucleating steam. Much of this modeling work was initially conducted on two dimensional flows in turbine cascade; in this regard the numerical approaches most often used have been the single phase, inviscid, and time-marching scheme of Denton for turbo-machinery flows as done by [8][9][10][11][12][13]. Using these approaches gives limitations on extending these methods to more complex flow conditions involving nucleation steam.…”

“…Using these approaches gives limitations on extending these methods to more complex flow conditions involving nucleation steam. With more sophisticated numerical models used that contains the viscous and turbulence effects as made by [12][13][14][15]. Therefore additional information about two phase flow behavior of nucleating steam can be achieved.…”