Transonic flows of a molecularly complex organic fluid through stator cascade were investigated by means large eddy simulations (LESs). The selected configuration was considered as representative the high-pressure stages high-temperature Organic Rankine Cycle (ORC) axial turbines, which may exhibit significant non-ideal gas effects. A heavy fluorocarbon, perhydrophenanthrene (PP11), working to ...

In this article, we prove the existence and regularity of a smooth solution for supersonic-sonic patch arising in modified Frankl problem study three-dimensional axisymmetric steady isentropic relativistic transonic flows over symmetric airfoil. We consider general convex equation state which makes complicated as well interesting context theory flows. Such type patches appear many an airfoil fl...

This paper presents a neural-network-based turbulence modeling approach for transonic flows based on the ensemble Kalman method. The adopts tensor-basis neural network Reynolds-stress representation, with modified inputs to consider fluid compressibility. normalization of input features is also investigated avoid feature collapsing in presence shock waves. Moreover, turbulent heat flux accordin...

In this paper, we prove the structural stability of transonic shocks for three-dimensional axisymmetric Euler system with swirl velocity under perturbations incoming supersonic flow, nozzle boundary, and exit pressure. Compared known results on shocks, one major difficulties flows swirls is that corner singularities near intersection point shock surface boundary artificial singularity axis appe...

A comparison of one and two dimensional models of transonic accretion discs around collapsed objects ABSTRACT: We construct models of the inner part of a transonic adiabatic accretion disc assuming constant specific angular momentum taking the vertical structure fully into account. For comparison purposes, we construct the corresponding one dimensional viscous disc models derived under vertical...

The effect of the blade tip geometry of a high pressure gas turbine is studied experimentally and computationally for high speed leakage flows. For this purpose two simplified models are constructed, one models a flat tip of the blade and the second models a cavity tip of the blade. Experimental results are obtained from a transonic wind tunnel to show the static pressure distribution along the...

We study the uniqueness of solutions with a transonic shock in a duct in a class of transonic shock solutions, which are not necessarily small perturbations of the background solution, for steady potential flow. We prove that, for given uniform supersonic upstream flow in a straight duct, there exists a unique uniform pressure at the exit of the duct such that a transonic shock solution exists ...

The benchmark active controls technology and wind tunnel test program at NASA Langley Research Center was started with the objective to investigate the nonlinear, unsteady aerodynamics and active flutter suppression of wings in transonic flow. The paper will present the flutter suppression control law design process, numerical nonlinear simulation and wind tunnel test results for the NACA 0012 ...

For transonic flows governed by the time-accurate Navier–Stokes equations, small, approximately periodic perturbations can be calculated accurately by transition to the frequency domain and truncating the Fourier expansion after the first harmonic. This is referred to as the linear frequency domain (LFD) method. In this paper, a parametric trajectory of reduced order models (ROMs) for the LFD s...

This paper concerns transonic shocks in compressible inviscid flow passing a twodimensional variable-area duct for the complete steady Euler system. The flow is supersonic at the entrance of the duct, whose boundaries are slightly curved. The condition of impenetrability is posed on the boundaries. After crossing a nearly flat shock front, which passes through a fixed point on the boundary of t...