The potential for improved performance of wave rotor cycles through the use of passage height variation is examined. A Quasi-one-dimensional CFD code with experimentally validated loss models is used to determine the flowfield in the wave rotor passages. Results indicate that a carefully chosen passage height profile can produce substantial performance gains. Numerical performance data are pres...

A flashlamp-pumped dye laser was modified to produce 80mJ/pulse, narrowband output at 532 nm suitable for pumping of Raman active transitions of the major combustion species CO2, H2O, N2, and O2. Simultaneous measurements of multiple species were obtained in atmospheric pressure methane-air flames, demonstrating absolutely quantitative measurements of species mole-fraction. Comparisons with Q-s...

Rocket and gas turbine combustion dynamics involves a confluence of diverse physics and interaction across a number of system components. Any comprehensive, self-consistent numerical model is burdened by a very large computational mesh, stiff unsteady processes which limit the permissible time step, and the need to perform tedious, repeated calculations for a broad parametric range. Predictive ...

The brittleness of ceramic materials like silicon nitride and silicon carbide makes it necessary to fabricate homogeneous structures and to detect small defects in the region of 10 to 100 microns diameter. In the German program on NDE for the gas turbine therefore a study was made to compare different NDE method.s and to develop new techniqt..es. Tests were made with ultrasonics, microradiograp...

OVERVIEW: Growing concern about environmental problems caused by thermal power plants is making the reduction of CO2 through more efficient power generation and the reduction of NOx and other emissions a top priority. The deregulation of the electric power industry, meanwhile, is helping to expand the demand for medium-capacity, high-efficiency thermal power plants geared toward IPP (independen...

Recent developments from the cast 718Plus® Metals Affordability Initiative (MAI) program will be presented and discussed. The objective of the program is to investigate and enable the use of 718Plus® (hereinafter referred to as 718Plus) in the form of investment castings by (1) increasing the allowable operating temperature by about 75°F as compared with conventional cast Alloy 718 and (2) achi...

The results of theoretical studies the possibilities using hybrid solid oxide fuel cell–gas turbine (SOFC-GT) systems for marine power plants are presented. A 500 kW auxiliary plant scheme stacks SOFCs in combination with a regenerative gas operating over-expansion based on our recent patent application is proposed. mathematical modelling showed opportunity to obtain efficiency about 55% optima...

Abstract Online wall temperatures were measured with fiber-coupled phosphor thermometry in a full-scale gas turbine combustor. The combustor was operated natural and up to 100 vol% hydrogen at engine-relevant conditions. Two phosphors tested for this application, namely YAG:Dy YAG:Tm;Li. Although YAG:Tm;Li seemed be the most promising it turned out incompatible used setup due strong interfering...