Aero-Thermal Performance of a Two-Dimensional Highly Loaded Transonic Turbine Nozzle Guide Vane: A Test Case for Inviscid and Viscous Flow Computations

Abstract

This contribution deals with an experimental aero-thermal investigation around a highly loaded transonic turbine nozzle guide vane mounted in a linear cascade arrangement. The measurements were performed in the von Karman Institute short duration Isentropic Light Piston Compression Tube facility allowing a correct simulation of Mach and Reynolds numbers as well as of the gas to wall temperature ratio compared to the values currently observed in modern aero engines. The experimental program consisted of flow periodicity checks by means of wall static pressure measurements and Schlieren flow visualizations, blade velocity distribution measurements by means of static pressure tappings, blade convective heat transfer measurements by means of platinum thin films, downstream loss coefficient and exit flow angle determinations by using a new fast traversing mechanism, and free-stream turbulence intensity and spectrum measurements. These different measurements were performed for several combinations of the free-stream flow parameters looking at the relative effects on the aerodynamic blade performance and blade convective heat transfer of Mach number, Reynolds number, and free-stream turbulence intensity.

Development of a Numerical Based Correlation for Performance Losses due to Surface Roughness in Axial Turbines

“…Accordingly, the VKI cascade recommended by von Karman Institute [6] is used for numerical investigation of blade roughness effects on the efficiency of the gas-turbine stator cascade. The blade cascade configuration is shown in Fig.…”

“…In Fig. 6, the exit flow angles of both models are compared with the experimental data of Arts et al [6] tested at Von Karman Institute. The distribution of the eddy viscosity ratio,  t /  L , along the blade pitch at various x/c x values is presented in Fig.…”

“…Arts et al [6] experimentally studied the linear VKI cascade of a gas turbine. They studied the relative effects of different flow conditions, Mach numbers, Reynolds numbers and various free-stream turbulence intensities on the aerodynamic performance and heat transfer.…”

An investigation of the heat transfer and static pressure on the over-tip casing wall of an axial turbine operating at engine representative flow conditions. (I). Time-mean results

“…This parameter has been measured in previous studies for Macor machineable glass ceramic, with values ranging from 1765 (Miller, 1981) to 2090 (Arts and Derouvroit, 1992). For the purposes of the current work, the properties of the particular batch of ceramic were measured and a value of 1950 ± 4% employed in all the data analysis.…”

Assessment of linear and non-linear two-equation turbulence models for aerothermal turbomachinery flows

“…This work is based on an experimental study carried out in the isentropic-light-piston-compression-tube facility CT-2 at Von Karman Institute [36] which is basically made of three main parts: a 5-meter long and 1-meter diameter cylinder, a test section and a downstreamdump tank. The cylinder contains a lightweight piston driven by air from a high pressure reservoir.…”